AD 2002-25-08

This amendment supersedes three existing airworthiness directives (AD's), that are applicable to GE CF6-45, -50, -80A, -80C2, and -80E1 turbofan engines. Those AD's currently require specific handling of the GE CF6 series high pressure compressor rotor (HPCR) stage 3-9 spools during a fluorescent penetrant inspection process, and initial and repetitive ultrasonic and eddy current inspections of certain HPCR stage 3-9 spools for cracks. This amendment removes the AD that requires special handling of the spools during fluorescent- penetrant inspection, and adjusts and combines the initial and repetitive inspection requirements, currently listed in two AD's, into one AD for the HPCR stage 3-9 spool. This amendment aligns repetitive inspection requirements with the more stringent initial inspection requirements mandated by AD 2000-16-12, Amendment 39-11868 (65 FR 50623, August 21, 2000) and terminates AD 95-18-14, Amendment 39-9361 (60 FR 46216, September 6, 1995) that is no longer necessary. The actions specified by this AD are intended to prevent cracks, which can cause separation of the HPCR stage 3-9 spool and possible uncontained engine failure.

Final rule.

2002-25-08 General Electric Company (GE): Docket No. 2001-NE-26-AD. Supersedes AD 95-18-14, Amendment 39-9361; AD 99-24-15, Amendment 39-11440; and AD 2000-16-12, Amendment 39-11868.

Applicability:This airworthiness directive (AD) is applicable to GE CF6-45, -50, -80A, -80C2, and -80E1 turbofan engines with high pressure compressor rotor (HPCR) stage 3-9 spools with part numbers (P/N's) listed in the following Table 1 installed:

Table 1

Engine model
HPCR stage 3-9 spool P/N
CF6-45/50 Series Engines
9136M89G02, 9136M89G03, 9136M89G06, 9136M89G07, 9136M89G08, 9136M89G09, 9136M89G17, 9136M89G18,
9136M89G19, 9136M89G21, 9136M89G22, 9136M89G27,
9136M89G29, 9253M85G01, 9253M85G02, 9273M14G01,
9331M29G01.
CF6-80A Series Engines
9136M89G10, 9136M89G11, 9136M89G20, 9136M89G21,
9136M89G22, 9136M89G27, 9136M89G28
CF6-80C2 Series Engines
1333M66G01, 1333M66G03, 1333M66G07, 1333M66G09,
1333M66G10, 1781M52P01, 1781M52P02, 1781M53G01,
1781M53G02 1781M53G03, 1781M53G04, 1781M53G05,
1781M53G06, 1781M53G07, 1781M53G08, 1781M53G09,
1781M53G10, 1854M95P01, 1854M95P02, 1854M95P03,
1854M95P04, 1854M95P05, 1854M95P06, 1854M95P07,
1854M95P08, 9380M28P05.
CF6-80E1 Series Engines
1669M22G01, 1669M22G03, 1782M22G01, 1782M22G02,
1782M22G04.

These engines are installed on, but not limited to, Airbus A300, A310, and A330 series, Boeing 747 and 767 series, and McDonnell Douglas DC-10 and MD-11 series airplanes.

Note 1: This AD applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (p) of this AD. The request should include an assessment of the effect of the modification,alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Compliance: Compliance with this AD is required as indicated, unless already done.

To detect cracks, which can cause separation of the HPCR stage 3-9 spool and possible uncontained engine failure, do the following:

CF6-45 and -50 16-Inch Billet Spools

(a) For CF6 HPCR stage 3-9 spool, part numbers (P/N's) 9136M89G02 and 9136M89G06; and for P/N's 9136M89G08, 9253M85G02, 9273M14G01, 9331M29G01 with serial numbers (SN's) listed in the following Table 2, do the following:

TABLE 2

MPOE3486 MPOG3832 MPOG3839 MPOG3846 MPOG5231 MPOG6731 MPOG6740 MPOG7713 MPOG7720 MPOG7727 MPOG7734 MPOG7741 MPOG7822 MPOG7829 MPOG7836 MPOG8825 MPOG8832 MPOG9186 MPOH0295 MPOH0302 MPOH2042 MPOH2049 MPOH2056 MPOH2829 MPOH2836 MPOH2843 MPOH2850 MPOH2857 MPOH4312 MPOH5282 MPOH5534 MPOH5541 MPOH5548 MPOH7020 MPOH7027 MPOH7968 MPOH7975 MPOH8644 MPOH8651 MPOH8658 MPOH8683

MPOE3487 MPOG3833 MPOG3840 MPOG3847 MPOG5232 MPOG6732 MPOG6741 MPOG7714 MPOG7721 MPOG7728 MPOG7735 MPOG7742 MPOG7823 MPOG7830 MPOG7837 MPOG8826 MPOG8833 MPOH0289 MPOH0296 MPOH0303 MPOH2043 MPOH2050 MPOH2057 MPOH2830 MPOH2837 MPOH2844 MPOH2851 MPOH2858 MPOH4313 MPOH5283 MPOH5535 MPOH5542 MPOH5549 MPOH7021 MPOH7028 MPOH7969 MPOH8638 MPOH8645 MPOH8652 MPOH8659 MPOH8684

MPOE3488 MPOG3834 MPOG3841 MPOG3848 MPOG6216 MPOG6733 MPOG6742 MPOG7715 MPOG7722 MPOG7729 MPOG7736 MPOG7743 MPOG7824 MPOG7831 MPOG7838 MPOG8827 MPOG8834 MPOH0290 MPOH0297 MPOH0304 MPOH2044 MPOH2051 MPOH2058 MPOH2831 MPOH2838 MPOH2845 MPOH2852 MPOH4307 MPOH5277 MPOH5520 MPOH5536 MPOH5543 MPOH5550 MPOH7022 MPOH7030 MPOH7970 MPOH8639 MPOH8646 MPOH8653 MPOH8677 MPOJ1796

MPOE3489 MPOG3835 MPOG3842 MPOG3850 MPOG6727 MPOG6735 MPOG6743 MPOG7716 MPOG7723 MPOG7730 MPOG7737 MPOG7744 MPOG7825 MPOG7832 MPOG7839 MPOG8828 MPOG8835 MPOH0291 MPOH0298 MPOH0305 MPOH2045 MPOH2052 MPOH2059 MPOH2832 MPOH2839 MPOH2846 MPOH2853 MPOH4308 MPOH5278 MPOH5530 MPOH5537 MPOH5544 MPOH5551 MPOH7023 MPOH7960 MPOH7971 MPOH8640 MPOH8647 MPOH8654 MPOH8678 MPOJ1797

MPOE3490 MPOG3836 MPOG3843 MPOG3851 MPOG6728 MPOG6736 MPOG6744 MPOG7717 MPOG7724 MPOG7731 MPOG7738 MPOG7819 MPOG7826 MPOG7833 MPOG8822 MPOG8829 MPOG8836 MPOH0292 MPOH0299 MPOH1805 MPOH2046 MPOH2053 MPOH2060 MPOH2833 MPOH2840 MPOH2847 MPOH2854 MPOH4309 MPOH5279 MPOH5531 MPOH5538 MPOH5545 MPOH5552 MPOH7024 MPOH7965 MPOH7972 MPOH8641 MPOH8648 MPOH8655 MPOH8679 MPOJ1798

MPOE3491 MPOG3837 MPOG3844 MPOG5228 MPOG6729 MPOG6738 MPOG6745 MPOG7718 MPOG7725 MPOG7732 MPOG7739 MPOG7820 MPOG7827 MPOG7834 MPOG8823 MPOG8830 MPOG8837 MPOH0293 MPOH0300 MPOH2040 MPOH2047 MPOH2054 MPOH2061 MPOH2834 MPOH2841 MPOH2848 MPOH2855 MPOH4310 MPOH5280 MPOH5532 MPOH5539 MPOH5546 MPOH5553 MPOH7025 MPOH7966 MPOH7973 MPOH8642 MPOH8649 MPOH8656 MPOH8680 MPOJ1799

MPOE3492 MPOG3838 MPOG3845 MPOG5230 MPOG6730 MPOG6739 MPOG6746MPOG7719 MPOG7726 MPOG7733 MPOG7740 MPOG7821 MPOG7828 MPOG7835 MPOG8824 MPOG8831 MPOG9185 MPOH0294 MPOH0301 MPOH2041 MPOH2048 MPOH2055 MPOH2062 MPOH2835 MPOH2842 MPOH2849 MPOH2856 MPOH4311 MPOH5281 MPOH5533 MPOH5540 MPOH5547 MPOH5554 MPOH7026 MPOH7967 MPOH7974 MPOH8643 MPOH8650 MPOH8657 MPOH8682 MPOJ1800

MPOJ1801 MPOJ1933 MPOJ1941 MPOJ1948 MPOJ1956 MPOJ2424 MPOJ2431 MPOJ2438 MPOJ2445 MPOJ4174 MPOJ6041 MPOJ6048 MPOJ6055 MPOJ6062 MPOJ6500 MPOJ6508 MPOJ6515 MPOJ7636 MPOJ7643 MPOJ9308 MPOJ9315 MPOK1239 MPOK1829 MPOK3068 MPOK4662 MPOK5083 MPOK5521 MPOK5960 MPOK6249 MPOK6256 MPOK6826 MPOK7227 MPOK7234 MPOM2134 MPOM2359 MPOM2366 MPOM5525 MPOM5532 MPOM6152 MPOM6159 MPOM7091 MPOM7098 MPOM7105 MPOM8299 MPOM9259 MPOM9723 MPON0058 MPON0065 MPON0075 MPON1082 MPON1090 MPON1097 MPON4254

MPOJ1803 MPOJ1934 MPOJ1942 MPOJ1949 MPOJ1957 MPOJ2425 MPOJ2432 MPOJ2439 MPOJ2446 MPOJ5185 MPOJ6042 MPOJ6049 MPOJ6056 MPOJ6063 MPOJ6501 MPOJ6509 MPOJ6516 MPOJ7637 MPOJ8046 MPOJ9309 MPOK1233 MPOK1240 MPOK1830 MPOK3069 MPOK4663 MPOK5084 MPOK5522 MPOK5961 MPOK6250 MPOK6257 MPOK6827 MPOK7228 MPOM2128 MPOM2135 MPOM2360 MPOM2461 MPOM5526 MPOM5533 MPOM6153 MPOM6160 MPOM7092 MPOM7099 MPOM7106 MPOM8300 MPOM9260 MPON0051 MPON0059 MPON0066 MPON0076 MPON1084 MPON1091 MPON1098 MPON4255

MPOJ1804 MPOJ1935 MPOJ1943 MPOJ1950 MPOJ1958 MPOJ2426 MPOJ2433 MPOJ2440 MPOJ2447 MPOJ5186 MPOJ6043 MPOJ6050 MPOJ6057 MPOJ6064 MPOJ6502 MPOJ6510 MPOJ6517 MPOJ7638 MPOJ8047 MPOJ9310 MPOK1234 MPOK1824 MPOK1831 MPOK3070 MPOK4664 MPOK5085 MPOK5955 MPOK5962 MPOK6251 MPOK6715 MPOK6828 MPOK7229 MPOM2129 MPOM2136 MPOM2361 MPOM2462 MPOM5527 MPOM5534 MPOM6154 MPOM6161 MPOM7093 MPOM7100 MPOM7107 MPOM8301 MPOM9261 MPON0052 MPON0060 MPON0067 MPON1077 MPON1085 MPON1092 MPON1099 MPON4256
MPOJ1806 MPOJ1936 MPOJ1944 MPOJ1951 MPOJ2420 MPOJ2427 MPOJ2434 MPOJ2441 MPOJ2448 MPOJ6035 MPOJ6044 MPOJ6051 MPOJ6058 MPOJ6065 MPOJ6503 MPOJ6511 MPOJ7632 MPOJ7639 MPOJ8048 MPOJ9311 MPOK1235 MPOK1825 MPOK1832 MPOK3071 MPOK4665 MPOK5086 MPOK5956 MPOK5963 MPOK6252 MPOK6716 MPOK6829 MPOK7230 MPOM2130 MPOM2137 MPOM2362 MPOM5521 MPOM5528 MPOM5535 MPOM6155 MPOM6162 MPOM7094 MPOM7101 MPOM7108 MPOM8302 MPOM9262 MPON0053 MPON0061 MPON0068 MPON1078 MPON1086 MPON1093 MPON1100

MPOJ1930 MPOJ1938 MPOJ1945 MPOJ1953 MPOJ2421 MPOJ2428 MPOJ2435 MPOJ2442 MPOJ2449 MPOJ6036 MPOJ6045 MPOJ6052 MPOJ6059 MPOJ6066 MPOJ6505 MPOJ6512 MPOJ7633 MPOJ7640 MPOJ8049 MPOJ9312 MPOK1236 MPOK1826 MPOK2694 MPOK4659 MPOK4666 MPOK5087 MPOK5957 MPOK5964 MPOK6253 MPOK6823 MPOK6830 MPOK7231 MPOM2131 MPOM2138 MPOM2363 MPOM5522 MPOM5529 MPOM5536 MPOM6156 MPOM7087 MPOM7095 MPOM7102 MPOM7109 MPOM9246 MPOM9265 MPON0055 MPON0062 MPON0069 MPON1079 MPON1087 MPON1094 MPON1642

MPOJ1931 MPOJ1939 MPOJ1946 MPOJ1954 MPOJ2422 MPOJ2429 MPOJ2436 MPOJ2443 MPOJ2450 MPOJ6039 MPOJ6046 MPOJ6053 MPOJ6060 MPOJ6067 MPOJ6506 MPOJ6513 MPOJ7634 MPOJ7641 MPOJ8050 MPOJ9313 MPOK1237 MPOK1827 MPOK2695 MPOK4660 MPOK4667 MPOK5088 MPOK5958 MPOK6247 MPOK6254 MPOK6824 MPOK6831 MPOK7232 MPOM2132 MPOM2357MPOM2364 MPOM5523 MPOM5530 MPOM5537 MPOM6157 MPOM7088 MPOM7096 MPOM7103 MPOM8297 MPOM9257 MPOM9721 MPON0056 MPON0063 MPON0073 MPON1080 MPON1088 MPON1095 MPON4250

MPOJ1932 MPOJ1940 MPOJ1947 MPOJ1955 MPOJ2423 MPOJ2430 MPOJ2437 MPOJ2444 MPOJ4173 MPOJ6040 MPOJ6047 MPOJ6054 MPOJ6061 MPOJ6068 MPOJ6507 MPOJ6514 MPOJ7635 MPOJ7642 MPOJ8051 MPOJ9314 MPOK1238 MPOK1828 MPOK3067 MPOK4661 MPOK5082 MPOK5520 MPOK5959 MPOK6248 MPOK6255 MPOK6825 MPOK7226 MPOK7233 MPOM2133 MPOM2358 MPOM2365 MPOM5524 MPOM5531 MPOM6151 MPOM6158 MPOM7089 MPOM7097 MPOM7104 MPOM8298 MPOM9258 MPOM9722 MPON0057 MPON0064 MPON0074 MPON1081 MPON1089 MPON1096 MPON4252

Initial Inspection

(1) If the spool has not already been inspected using one of the alert service bulletins (ASB's) or service bulletins (SB's) listed in Column A of the following Table 3; OR a combination of one procedure from Column B and one from Column C; OR a combination of one procedure from Column D and one from Column E, inspect hub and bore inaccordance with alert service bulletin

(ASB) CF6-50 S/B 72-A1108, Revision 5, dated October 2, 2002, and the following compliance times:

TABLE 3

CF6-45 and -50
SB No.

Procedures (70-32-XX) in Standard Practices Manual GEK9250
Column A
Column B
Column C
Column D
Column E
SB 72-888, Revision 3, dated January 31, 1991.
70-32-09, Revision 71, dated October 1, 1995.
70-32-10, 71, Revision dated October 1, 1995.
70-32-13, Temporary Re- vision (TR), 70-25, dated August 26, 1996.
70-32-14, TR 70-26, dated August 26, 1996.
SB 72-888, Revision 4, dated March 28, 1991.
70-32-09, Revision 72, dated November 15, 1996.
70-32-10, Revision 72, dated November 15, 1996.
70-32-13, Revision 72, dated November 15, 1996.
70-32-14, Revision 72, dated November 15, 1996.
SB 72-888, Revision 5, dated November 7, 1994.
70-32-09, Revision 74, dated May 1, 1998.
70-32-10, Revision 74, dated May 1, 1998.
70-32-13, Revision 73, dated November 1, 1997.
70-32-14, Revision 73,dated November 1, 1997.
SB 72-888, Revision 6, dated December 22, 1995.

70-32-10, Revision 75, dated December 15, 1998.
70-32-13, Revision 75, dated December 15, 1998.
70-32-14, Revision 75, dated December 15, 1998.
SB 72-1000, Original dated December 14, 1990.

70-32-13, TR 70-41, dated February 10, 1999.
70-32-14, TR 70-42, dated February 10, 1999.
SB 72-1000, Revision 1, dated March 28, 1991.

70-32-13, Revision 76, dated May 15, 1999.
70-32-14, Revision 76, dated May 15, 1999.
SB 72-1000, Revision 2, dated September 9, 1993.

70-32-17, TR 70-39, dated December 15, 1998.
70-32-18, TR 70-40, dated December 15, 1998.
SB 72-1000, Revision 3, dated December 22, 1995.

70-32-17, Revision 76, dated May 15, 1999.
70-32-18, Revision 76, dated May 15, 1999.
SB 72-1108, Original, dated November 6, 1995.

SB 72-1108, Revision 1, dated July 29, 1996.

ASB 72-A1108, Revision 2, dated October 28, 1999.

ASB 72-A1108, Revision 3, dated November 12, 1999.

ASB 72-A1108, Revision 4, dated June 6, 2001.

ASB CF6-50 S/B 72- A1108, Revision 5, dated October 2, 2002.

70-32-17, TR 70-47, dated October 28, 1999.
70-32-18, TR 70-48, dated October 28, 1999.

(i) For spools with greater than 3,500 cycles-since-new (CSN) on the effective date of this AD, inspect before further flight.

(ii) For spools with 3,500 or fewer CSN, on the effective date of this AD, inspect at the first piece-part exposure (PPE) after 1,000 CSN or before 3,500 CSN, whichever occurs earlier.

(2) For spools that have not been inspected using ASB CF6-50 S/B 72-A1131, Revision 4, dated October 2, 2002, or an earlier revision of ASB CF6-50 S/B 72-A1131 or SB 72-1131, inspect the web and hub- to-web transition areas in accordance with the requirements of ASB CF6-50 S/B 72-A1131, Revision 4, dated October 2, 2002, at the first PPE after 1,000 CSN, but before 4,000 additional cycles in-service (CIS) after the effective date of this AD.

(3) For spools that have not been inspected using ASB CF6-50 S/B 72-A1157, Revision 4, dated October 2, 2002, or an earlier revision of ASB CF6-50 S/B 72-A1157, inspect the stage 3-5 dovetail slot bottoms in accordance with the requirements of ASB CF6-50 S/B 72- A1157, Revision 4, dated October 2, 2002, at the earliest of:

(i) The first PPE after 1000 CSN, or

(ii) The first HPC rotor exposure after 1000 CSN, or

(iii) The next required inspection to ASB CF6-50 S/B 72-A1108, Revision 5, dated October 2, 2002.

Repetitive Inspection

(4) For spools that have already been inspected using one of the ASB's or SB's listed in Column A of Table 3; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, reinspect the hub and bore in accordance with the requirements of ASB CF6-50 S/B 72- A1108, Revision 5, dated October 2, 2002, and the stage 3-5 dovetail slot bottoms in accordance with ASB CF6-50 S/B 72-A1157,Revision 4, dated October 2, 2002, at the earliest of:

(i) Each PPE with more than 1,000 cycles-since-last-inspection (CSLI) and 3,500 CSN, or

(ii) From July 29, 2001 through January 27, 2003, before the cycle limits of the following Table 4:

TABLE 4

CSN at last inspection
Repeat inspection by -

(A) 6,000 or fewer CSN
3,500 CSLI.
(B) 6,001 to 7,000 CSN
9,500 CSN.
(C) 7,001 to 8,000 CSN
2,500 CSLI.
(D) 8,001 to 8,500 CSN
10,500 CSN.
(E) 8,501 or more CSN
2,000 CSLI.

(iii) After January 27, 2003, before the cycle limits of the following Table 5:

TABLE 5.

CSN at last inspection
Repeat inspection by -
(A) 5,000 or fewer CSN
3,500 CSLI.
(B) 5,001 to 5,500 CSN
8,500 CSN.
(C) 5,501 to 6,500 CSN
3,000 CSLI.
(D) 6,501 to 7,000 CSN
9,500 CSN.
(E) 7,001 to 8,000 CSN
2,500 CSLI.
(F) 8,001 to 8,500 CSN
10,500 CSN.
(G) 8,501 or more CSN
2,000 CSLI.

Spool Disposition

(5) If inspection findings equal or exceed the reject limits established by ASB CF6-50 S/B 72-A1108, Revision 5, dated October 2, 2002; or ASB CF6-50 S/B 72-A1131, Revision 4, dated October 2, 2002; or ASB CF6-50 S/B 72-A1157, Revision 4, dated October 2, 2002, replace spool before further flight.

CF6-45 and -50 13-inch Billet Spools

(b) For CF6 HPC Rotor Stage 3-9 Spool, P/N's 9136M89G03, 9136M89G07, 9136M89G09, 9136M89G17, 9136M89G18, 9253M85G01, and for P/N's 9136M89G08, 9253M85G01, 9273M14G01, and 9331M29G01 with serial numbers that are not listed in Table 2, do the following:

Initial Inspection

(1) If the spool has greater than 7,000 CSN on the effective date of this AD and has not already been inspected using one of the ASB's or SB's listed in Column A of Table 3; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, inspect hub and bore in accordance with ASB CF6-50 S/B 72-A1108, Revision 5, dated October 2, 2002 before further flight.

(2) If the spool has 7,000 or fewer CSN on the effective date of this AD and has not already been inspected using one of the ASB's or SB's listed in Column A of Table 3; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, inspect hub and bore in accordance with ASB CF6-50 S/B 72-A1108, Revision 5, dated October 2, 2002, at the earliest of:

(i) The first PPE after 1,000 CSN, or

(ii) The first engine shop visit (ESV) after 4,000 CSN, or

(iii) From July 29, 2001, through January 27, 2003, before 7,000 CSN, and after January 27, 2003, before 4,000 CSN.

(3) For spools that have not been inspected using ASB CF6-50 S/B 72-A1131, Revision 4, dated October 2, 2002, or an earlier revision of ASB CF6-50 S/B 72-A1131 or SB 72-1131, inspect the web and hub- to-web transition areas in accordance with the requirements of ASB CF6-50 S/B 72-A1131, Revision 4, dated October 2, 2002, at the earlier of:
(i) The first PPE after 1,000 CSN, or

(ii) Within 4,000 additional CIS after the effective date of this AD.

(4) For spools that have not been inspected using ASB CF6-50 S/B 72-A1157, Revision 4, dated October 2, 2002, or an earlier revision of ASB CF6-50 S/B 72-A1157, inspect the stage 3-5 dovetail slot bottoms in accordance with the requirements of ASB CF6-50 S/B 72- A1157, Revision 4, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) Within 4,000 additional CIS after the effective date of this AD.

Repetitive Inspection

(5) For spools that have already been inspected using one of the ASB's or SB's listed in Column A of Table 3; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, reinspect the hub and bore in accordance with the requirements of ASB CF6-50 S/B 72- A1108, Revision 5, dated October 2, 2002, at the earliest of:

(i) Each PPE with more than 1,000 CSLI and 4,000 CSN, or

(ii) Each ESV with more than 2,000 CSLI and 4,000 CSN, or

(iii) Before 4,000 CSLI.

Spool Disposition

(6) If inspection findings equal or exceed the reject limits established by ASB CF6-50 S/B 72-A1108, Revision 5, dated October 2, 2002; or ASB CF6-50 S/B 72-A1131, Revision 4, dated October 2, 2002; or ASB CF6-50 S/B 72-A1157, Revision 4, dated October 2, 2002, replace spool before further flight.

CF6-45 and -50 9 and 10-Inch Billet Spools

(c) For CF6 HPCR stage 3-9 spool, P/N's 9136M89G19, 9136M89G21, 9136M89G22 and 9136M89G27, do the following:

Initial Inspection

(1) If the spool has greater than 7,000 CSN on the effective date of this AD and has not already been inspected using one of the ASB's or SB's listed in Column A of Table 3; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, inspect the hub and bore in accordance with ASB CF6-50 S/B 72-A1108, Revision 5, dated October 2, 2002 before further flight.

(2) If the spool has 7,000 or fewer CSN on the effective date of this AD, and has not already been inspected using one of the ASB's or SB's listed in Column A of Table 3; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, inspect the hub and bore in accordance with ASB CF6-50 S/B 72-A1108, Revision 5, dated October 2, 2002, at the earliest of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 3,000 CSN, or

(iii) From July 29, 2001 through January 27, 2003, before 7,000 CSN, and after January 27, 2003, before 3,500 CSN.

(3) For spools that have not been inspected using ASB CF6-50 S/B 72-A1131, Revision 4, dated October 2, 2002, or an earlier revision of ASB CF6-50 S/B 72-A1131 or SB CF6-50 S/B 72-1131, inspect the web and hub-to-web transition areas in accordance with the requirements of ASB CF6-50 S/B 72-A1131, Revision 4, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) Within 4,000 additional CIS after the effective date of this AD.

(4) For spools that have not been inspected using ASB CF6-50 S/B 72-A1157, Revision 4, dated October 2, 2002, or an earlier revision of ASB CF6-50 S/B 72-A1157, inspect the stage 3-5 dovetail slot bottom in accordance with the requirements of ASB CF6-50 S/B 72- A1157, Revision 4, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) Within 4,000 additional CIS after the effective date of this AD.

Repetitive Inspection

(5) For spools that have already been inspected using one of the ASB's or SB's listed in Column A of Table 3; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, reinspect the hub and bore in accordance with the requirements of ASB CF6-50 S/B 72- A1108, Revision 5, dated October 2, 2002, at the earliest of:

(i) Each PPE with more than 1,000 CSLI and 3,500 CSN, or

(ii) From July 29, 2001, through January 27, 2003, before the cycle limits of the following Table 6, or:

TABLE 6

CSN at last inspection
Reinspect by

(A) 3,500 or fewer CSN
7,000 CSN.
(B) 3,501 to 6,000 CSN
3,500 CSLI.
(C) 6,001 to 7,000 CSN
9,500 CSN.
(D) 7,001 to 8,000 CSN
2,500 CSLI.
(E) 8,001 to 8,500 CSN
10,500 CSN.
(F) 8,501 or more CSN
2,000 CSLI.

(iii) After January 27, 2003, before the cycle limits of Table 5.

Spool Disposition

(6) If inspection findings equal or exceed the reject limits established by ASB CF6-50 S/B 72-A1108, Revision 5, dated October 2, 2002; or ASB CF6-50 S/B 72-A1131, Revision 4, dated October 2, 2002; or ASB CF6-50 S/B 72-A1157, Revision 4, dated October 2, 2002; replace spool before further flight.

SpoolReinstallation Limit

(7) After the effective date of this AD, do not install any engine that has an HPCR stage 3-9 spool, P/N's 9136M89G19, 9136M89G21, 9136M89G22, and 9136M89G27, installed where the spool has 10,500 or more CSN.

CF6-45 and -50 8-Inch Billet 2-Piece spools

(d) For CF6 HPCR stage 3-9 spool, P/N 9136M89G29, do the following:

(1) If the spool has not already been inspected using one of the ASB's or SB's listed in Column A of Table 3; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, inspect hub and bore in accordance with the piece-part level inspection of ASB CF6- 50 S/B 72-A1108, Revision 5, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 6,000 CSN.

(2) For spools that have not been inspected using ASB CF6-50 S/B 72-A1131, Revision 4, dated October 2, 2002, or an earlier revision of ASB CF6-50 S/B 72-A1131 or SB 72-1131, inspect the web and hub- to-web transition areas in accordance with the requirements of ASB CF6-50 S/B 72-A1131, Revision 4, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 6,000 CSN.

(3) For spools that have not been inspected using ASB CF6-50 S/B 72-A1157, Revision 4, dated October 2, 2002, or an earlier revision of ASB 72-A1157, inspect the stage 3-5 dovetail slot bottom in accordance with the requirements of ASB CF6-50 S/B 72-A1157, Revision 4, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 6,000 CSN.

Spool Disposition

(4) If inspection findings equal or exceed the reject limits established by ASB CF6-50 S/B 72-A1108, Revision 5, dated October 2, 2002; or ASB CF6-50 S/B 72-A1131, Revision 4, dated October 2, 2002; or ASB CF6-50 S/B 72-A1157, Revision 4, dated October 2, 2002; replace spool before further flight.

CF6-80A 16-Inch Billet Spools

(e) For CF6 HPCR stage 3-9 spool, P/N's 9136M89G10 with SN's MPOM0054, MPOM7090, MPOM8303, MPOM8304, MPOM9263, MPOM9264, MPON0054, MPON0071, MPON0072, MPON1643, MPON4251, or MPON4253, do the following:

Initial Inspection

(1) If the spool has not already been inspected using one of the ASB's or SB's listed in Column A of the following Table 7; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, inspect hub and bore in accordance with ASB CF6-80A S/B 72-A0678, Revision 5, dated October 2, 2002, and the following compliance times:

CF6-80A SB No.

Procedures (70-32-XX) in standard practices manual GEK9250
Column A
Column B
Column C
Column D
Column E
SB 72-500, Revision 3, dated March 19, 1991.

SB 72-500, Revision 4, dated July 1, 1991.

SB 72-500, Revision 5, dated November 7, 1994.

SB 72-500, Revision 6, dated December 22, 1995.
SB 72-583, Original, dated December 20, 1990.

SB 72-583, Revision 1, dated March 18, 1991. SB 72-583, Revision 2, dated July 15, 1991.

SB 72-583, Revision 3, dated July 24, 1991. SB 72-583, Revision 4, dated September 15, 1993.
SB 72-583, Revision 5, dated December 22, 1995.
SB 72-678, Original, dated November 6, 1995. SB 72-678, Revision 1, dated July 29, 1996. ASB 72-A678, Revision 2, dated October 28, 1999. ASB 72-A678, Revision 3, dated November 12, 1999.
ASB 72-A0678, Revision 4, dated June 6, 2001. ASB CF6-80A
S/B 72-A0678, Revision 5, dated October 2, 2002.

70-32-09, Revision 71, dated October 1, 1995.

70-32-09, Revision 72, dated November 15, 1996.
70-32-09, Revision 74, dated May 1, 1998.

70-32-10, Revision 71, dated October 1, 1995

70-32-10, Revision 72, dated November 15, 1996.
70-32-10, Revision 74, dated May 1, 1998.

70-32-10, Revision 75, dated December 15, 1998.

70-32-13, Temporary Revision (TR), 70-25, datedAugust 26, 1996. 70-32-13, Revision 72, dated November 15, 1996.
70-32-13, Revision 73, dated November 1, 1997
70-32-13, Revision 75, dated December 15, 1998.

70-32-13, TR 70-41, dated February 10, 1999

70-32-13, Revision 76, dated May 15, 1999. 70-32-17, TR 70-39, dated December 15, 1998.
70-32-17, Revision 76, dated May 15, 1999. 70-32-17, TR 70-47, dated October 28, 1999.

70-32-14, TR 70-26, dated August 26, 1996.

70-32-14, Revision 72, dated November 15, 1996.
70-32-14, Revision 73, dated November 1, 1997. 70-32-14, Revision 75, dated December 15, 1998.

70-32-14, TR 70-42, dated February 10, 1999.
70-32-14, Revision 76, dated May 15, 1999.
70-32-18, TR 70--40, dated December 15, 1998.
70-32-18, Revision 76, dated May 15, 1999. 70-32-18, TR 70-48, dated October 28, 1999.

(i) For spools with greater than 3,500 CSN on the effective date of this AD, inspect before further flight.

(ii) For spools with 3,500 or fewer CSN on the effective dateof this AD, inspect at the first PPE after 1,000 CSN or before 3,500 CSN, whichever occurs earlier.

(2) For spools that have not been inspected using ASB CF6-80A S/ B 72-A0691, Revision 5, dated October 2, 2002, or an earlier revision of ASB CF6-80A S/B 72-A0691 or SB 72-0691, inspect the web and hub-to-web transition areas in accordance with the requirements of ASB CF6-80A S/B 72-A0691, Revision 5, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) Within 4,000 additional CIS accumulated after the effective date of this AD.

(3) For spools that have not been inspected using ASB CF6-80A S/ B 72-A0719, Revision 5, dated October 2, 2002, or an earlier revision of ASB CF6-80A S/B 72-A0719, inspect the stage 3--5 dovetail slot bottom in accordance with the requirements of ASB CF6- 80A S/B 72-A0719, Revision 5, dated October 2, 2002, at the earliest of:

(i) The first PPE after 1,000 CSN, or

(ii) The first HPCR exposure after 1,000 CSN, or

(iii) The next required inspection to ASB

CF6-80A S/B 72-A0678, Revision 5, dated October 2, 2002.

Repetitive Inspections

(4) For spools that have already been inspected using one of the ASB's or SB's listed in Column A of Table 7; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D and one from Column E, reinspect the hub and bore in accordance with the requirements of ASB CF6-80A S/B 72- A0678, Revision 5, dated October 2, 2002; and the dovetail slot bottoms in accordance with the requirements of ASB CF6-80A S/B 72- A0719, Revision 5, dated October 2, 2002, at the earliest of:

(i) Each PPE with more than 1,000 CSLI and 3,500 CSN, or

(ii) From July 29, 2001 through January 27, 2003 before the cycle limits of Table 4, or

(iii) After January 27, 2003, before the cycle limits of Table 5.

Spool Disposition

(5) If inspection findings equal or exceed the reject limits established by ASB CF6-80A S/B 72-A0678, Revision 5, dated October 2, 2002; or ASB CF6-80A S/B 72-A0691, Revision 5, dated October 2, 2002; or ASB CF6-80A S/B 72-A0719, Revision 5, dated October 2, 2002; replace spool before further flight.

Spool Reinstallation Limit

(6) After the effective date of this AD, do not install any engine that has an HPCR stage 3-9 spool P/N 9136M89G10 with serial numbers (SN's) MPOM0054, MPOM7090, MPOM8303, MPOM8304, MPOM9263, MPOM9264, MPON0054, MPON0071, MPON0072, MPON1643, MPON4251, or MPON4253, installed where the spool has 10,500 or more CSN.

CF6-80A 13-Inch Billet Spools

(f) For all other CF6 HPCR stage 3-9 spools, P/N 9136M89G10, with SN's that are not listed in paragraph (e) of this AD, and P/N 9136M89G11, do the following:

Initial Inspection

(1) If the spool has greater than 7,000 CSN on the effective date of this AD and has not already been inspected using one of the ASB's or SB's listed in Column A of Table 7; OR a combination of one procedure from Column B and one from Column C; OR a combination of one procedure from Column D and one from Column E, inspect hub and bore in accordance with ASB CF6-80A 72-A0678, Revision 5, dated October 2, 2002 before further flight.

(2) If the spool has 7,000 or fewer CSN on the effective date of this AD and has not already been inspected using one of the ASB's or SB's listed in Column A of Table 7; OR a combination of one procedure from Column B and one from Column C; OR a combination of one procedure from Column D and one from Column E, inspect hub and bore in accordance with ASB CF6-80A S/B 72-A0678, Revision 5, dated October 2, 2002, at the earliest of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 5,000 CSN or

(iii) From July 29, 2001, through January 27, 2003 before 7,000 CSN, and after January 27, 2003, before 5,000 CSN.

(3) For spools that have not been inspected using ASB CF6-80A S/ B 72-A0691, Revision 5, dated October2, 2002, or an earlier revision of ASB CF6-80A S/B 72-A0691 or SB 72-0691, inspect the web and hub-to-web transition areas in accordance with the requirements of ASB CF6-80A S/B 72-A0691, Revision 5, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) Within 4,000 additional CIS after the effective date of this AD.

(4) For spools that have not been inspected using ASB CF6-80A S/ B 72-A0719, Revision 5, dated October 2, 2002, or an earlier revision of ASB CF6-80A S/B 72-A0719, inspect the dovetail slot bottom in accordance with the requirements of ASB CF6-80A S/B 72- A0719, Revision 5, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) Within 4,000 additional CIS after the effective date of this AD.

Repetitive Inspection

(5) For spools installed in CF6-80A1 and CF6-80A3 engines that were inspected using one of the ASB's or SB's listed in Column A of Table 7; OR a combination of one procedure from Column B and one from Column C; OR a combination of one procedure from Column D and one from Column E, reinspect hub and bore in accordance with alert ASB CF6-80A S/B 72-A0678, Revision 5, dated October 2, 2002, at the earliest of:

(i) Each PPE with more than 1,000 CSLI and 5,000 CSN, or

(ii) Each ESV with more than 2,000 CSLI and 5,000 CSN, or

(iii) Within 4,000 CSLI and more than 5,000 CSN.

(6) Spools installed in CF6-80A and CF6-80A2 engines previously inspected using one of the ASB's or SB's listed in Column A of Table 7; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, reinspect hub and bore in accordance with ASB CF6-80A S/B 72-A0678, Revision 5, dated October 2, 2002, at the earliest of:

(i) Each PPE with more than 1,000 CSLI and 5,000 CSN, or

(ii) Each ESV with more than 1,500 CSLI and 5,000 CSN, or

(iii) Within 4,000 CSLI and more than 5,000 CSN.

Spool Disposition

(7) If inspection findings equal or exceed the reject limits established by ASB CF6-80A S/B 72-A0678, Revision 5, dated October 2, 2002; or ASB CF6-80A S/B 72-A0691, Revision 5, dated October 2, 2002; or ASB CF6-80A S/B 72-A0719, Revision 5, dated October 2, 2002; replace spool before further flight.

CF6-80A 9 and 10-Inch Billet Spools

(g) For CF6 HPCR stage 3-9 spools, P/N's 9136M89G20, 9136M89G21, 9136M89G22 and 9136M89G27, do the following:

Initial Inspection

(1) If the spool has greater than 7,000 CSN on the effective date of this AD and has not already been inspected using one of the ASB's or SB's listed in Column A of Table 7; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, inspect hub and bore in accordance with ASB CF6-80A S/B 72-A0678, Revision 5, dated October 2, 2002 before further flight.

(2) If the spool has 7,000 or fewer CSN on the effective date of this AD and has not already been inspected using one of the ASB's or SB's listed in Column A of Table 7; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, inspect hub and bore in accordance with ASB CF6-80A S/B 72-A0678, Revision 5, dated October 2, 2002, at the earliest of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 3,000 CSN or

(iii) From July 29, 2001, through January 27, 2003, before 7,000 CSN, and after January 27, 2003, before 5,000 CSN.

(3) For spools that have not been inspected using ASB CF6-80A S/ B 72-A0691, Revision 5, dated October 2, 2002, or an earlier revision of ASB CF6-80A S/B 72-A0691, or SB 72-0691, inspect the web and hub-to-web transition areas in accordance with the requirements of ASB CF6-80A S/B 72-A0691, Revision 5, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or(ii) Within 4,000 additional CIS after the effective date of this AD.

(4) For spools that have not been inspected using ASB CF6-80A S/ B 72-A0719, Revision 5, dated October 2, 2002, or an earlier revision of ASB CF6-80A S/B 72-A0719 inspect the dovetail slot bottom in accordance with the requirements of ASB CF6-80A S/B 72- A0719, Revision 5, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) Within 4,000 additional CIS after the effective date of this AD.

Repetitive Inspection

(5) For spools that have already been inspected using one of the ASB's or SB's listed in Column A of Table 7; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, reinspect hub and bore in accordance with ASB CF6-80A S/B 72-A0678, Revision 5, dated October 2, 2002, at the earliest of:

(i) Each PPE with more than 1,000 CSLI and 5,000 CSN, or

(ii) From July 29, 2001 through January 27, 2003, before the cycle limits of Table 6.

(iii) After January 27, 2003, before the cycle limits of the following Table 8:

TABLE 8

CSN at last inspection
Repeat inspection by -
(A) 1,500 or fewer CSN
5,000 CSN
(B) 1,501 to 5,000 CSN
3,500 CSLI
(C) 5,001 to 5,500 CSN
8,500 CSN
(D) 5,501 to 6,501 CSN
3,000 CSLI
(E) 6,501 to 7,000 CSN
9,500 CSN
(F) 7,001 to 8,000 CSN
2,500 CSLI
(G) 8,001 to 8,500 CSN
10,500 CSN
(H) 8,501 or more CSN
2,000 CSLI

Spool Disposition

(6) If inspection findings equal or exceed the reject limits established by ASB CF6-80A S/B 72-A0678, Revision 5, dated October 2, 2002; or ASB CF6-80A S/B 72-A0691, Revision 5, dated October 2, 2002; or ASB CF6-80A S/B 72-A0719, Revision 5, dated October 2, 2002; replace spool before further flight.

Spool Reinstallation Limit

(7) After the effective date of this AD, do not install any engine that has an HPCR stage 3-9 spool, P/N's 9136M89G20, 9136M89G21, 9136M89G22, and 9136M89G27, installed where the spool has 10,500 or more CSN.

CF6-80A 8-Inch Billet 2-Piece Spools

(h) For CF6 HPCR stage 3-9 spool, P/N 9136M89G28, do the following:

(1) If the spool has not already been inspected using one of the ASB's or SB's listed in Column A of Table 7; OR a combination of one procedure from Column B and one from Column C; OR a combination of one procedure from Column D and one from Column E, inspect hub and bore in accordance with the piece-part level inspection of ASB CF6- 80A S/B 72-A0678, Revision 5, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 6,000 CSN.

(2) For spools that have not been inspected using ASB CF6-80A S/ B 72-A0691, Revision 5, dated October 2, 2002, or an earlier revision of ASB CF6-80A S/B 72-A0691, or SB 72-0691, inspect the web and hub-to-web transition areas in accordance with the requirements of ASB CF6-80A S/B 72-A0691, Revision5, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 6,000 CSN.

(3) For spools that have not been inspected using ASB CF6-80A S/ B 72-A0719, Revision 5, dated October 2, 2002, or an earlier revision of ASB CF6-80A S/B 72-A0719 inspect the stage 3--5 dovetail slot bottom in accordance with the requirements of ASB CF6-80A S/B 72-A0719, Revision 5, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 6,000 CSN.

Spool Disposition

(4) If inspection findings equal or exceed the reject limits established by ASB CF6-80A S/B 72-A0678, Revision 5, dated October 2, 2002; or ASB CF6-80A S/B 72-A0691, Revision 5, dated October 2, 2002; or ASB CF6-80A S/B 72-A0719, Revision 5, dated October 2, 2002; replace spool before further flight.

CF6-80C2 13-Inch Billet Spools

(i) For CF6 HPCR stage 3-9 spool, P/N's 1781M52P01, 1854M95P02,1781M52P02, 1854M95P05and 9380M28P05, do the following:

Initial Inspection

(1) If the spool has not already been inspected using one of the ASB's or SB's listed in Column A of the following Table 9; OR a combination of one procedure from Column B and one from Column C; OR a combination of one procedure from Column D and one from Column E, inspect hub and bore in accordance with ASB CF6-80C2 S/B 72-A0812, Revision 4, dated October 2, 2002, and the following compliance times:

Table 9

CF6-80C2 SB No

Procedures (70-32-XX) in standard practices manual GEK9250
Column A
Column B
Column C
Column D
Column E
SB 72-418, Revision 2, May 14, 1991.

SB 72-418, Revision 3, November 7, 1994.

SB 72-418, Revision 4, December 22, 1995.

SB 72-758, Original, dated November 7, 1994.

SB 72-758, Revision 1, dated December 22, 1995.
SB 72-812, Original, dated November 6, 1995.
SB 72-812, Revision 1, dated january 30, 1998.

ASB 72-A0812, Revision 2, dated October 28, 1999.ASB 72-A0812, Revision 3, dated June 6, 2001. ASB CF6-80C2 S/B 72-A0812, Revision 4, dated October 2, 2002..

70-32-09, Revision 71,
dated October 1, 1995.

70-32-09, Revision 72,
dated November 15,
1996.
70-32-09, Revision 74,
dated May 1, 1998.

70-32-10, Revision 71, dated October 1, 1995.

70-32-10, Revision 72, dated November 15, 1996.
70-32-10, Revision 74, dated May 1, 1998.

70-32-10, Revision 75, dated December 15, 1998.

70-32-13, Temporary Revision (TR), 70-25, dated August 26, 1996. 70-32-13, Revision 72, dated November 15, 1996.
70-32-13, Revision 73, dated November 1, 1997
70-32-13, Revision 75, dated December 15, 1998.
70-32-13, TR 70-41, dated February 10, 1999

70-32-13, Revision 76, dated May 15, 1999.

70-32-17, TR70-39, dated December 15, 1998.

70-32-17, Revision 76, dated May 15, 1999.

70-32-17, TR 70-47, dated October 28, 1999.

70-32-14, TR 70-26, dated August 26, 1996.

70-32-14, Revision 72,dated November 15, 1996.
70-32-14, Revision 73, dated November 1, 1997.
70-32-14, Revision 75, dated December 15, 1998.
70-32-14, TR 70-42, dated February 10, 1999.

70-32-14, Revision 76, dated May 15, 1999.

70-322-18, TR 70-40, dated December 15, 1998.

70-32-18, Revision 76, dated May 15, 1999.

70-32-18, TR 70-48, October 28, 1999.

(i) For spools with greater than 3,500 CSN on the effective date of this AD, inspect before further flight.

(ii) For spools with 3,500 or fewer CSN on the effective date of this AD, inspect at the first PPE after 1,000 CSN or before 3,500 CSN, whichever occurs earlier.

(2) For spools that have not been inspected using ASB CF6-80C2 S/B 72-A0848, Revision 8, dated October 2, 2002, or an earlier revision of ASB 72-A0848 or SB 72-0848, inspect the web and hub-to- web transition areas in accordance with the requirements of ASB CF6- 80C2 S/B 72-A0848, Revision 8, dated October 2, 2002, at the earliest of:

(i) The first PPE after 1000 CSN, or

(ii) The next required inspection to ASB CF6-80C2 S/B 72-A0812, Revision 4, dated October 2, 2002, or

(iii) From July 29, 2001 through January 27, 2003, before 7,000 CSN, and after January 27, 2003, before 3,500 CSN.

(3) For spools that have not been inspected using ASB CF6-80C2 S/B 72-A0934, Revision 4, dated October 2, 2002, or an earlier revision of ASB 72-A0934, inspect the stage 3-5 dovetail slot bottom in accordance with the requirements of ASB CF6-80C2 S/B 72-A0934, Revision 4, dated October 2, 2002, at the earliest of:

(i) The first PPE after 1,000 CSN, or

(ii) The first HPCR exposure after 1,000 CSN, or

(iii) The next required inspection to ASB

CF6-80C2 S/B 72-A0812, Revision 4, dated October 2, 2002.

Repetitive Inspection

(4) For spools that have already been inspected using one of the ASB's or SB's listed in Column A of Table 9; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, reinspect the hub and bore in accordance with ASB 72-A812, Revision 4, dated October 2, 2002; the web and hub-to-web transition areas in accordance with ASB CF6-80C2 S/B 72-A0848, Revision 8, dated October 2, 2002; and the stage 3-5 dovetail slot bottoms in accordance with ASB CF6-80C2 S/B 72-A0934, Revision 4, dated October 2, 2002, at the earliest of:

(i) Each PPE with more than 1,000 CSLI and 3,500 CSN, or

(ii) From July 29, 2001, through January 27, 2003, before the cycle limits of Table 4.

(iii) After January 27, 2003, before the cycle limits of Table 5.

Spool Disposition

(5) If inspection findings equal or exceed the reject limits established by ASB CF6-80C2 S/B 72-A0812, Revision 4, dated October 2, 2002, or ASB CF6-80C2 S/B 72-A0848, Revision 8, dated October 2, 2002, or ASB CF6-80C2 S/B 72-A0934, Revision 4, dated October 2, 2002; replace spool before further flight.

Spool ReinstallationLimit

(6) After the effective date of this AD, do not install any engine that has an HPCR stage 3-9 spool, P/N's 1781M52P01, 1781M52P02, 1854M95P02, 1854M95P05, and 9380M28P05, installed where the spool has 10,500 or more CSN.

CF6-80C2 9 and 10-Inch Billet Spools

(j) For CF6 HPCR stage 3-9 spool, P/Ns 1333M66G01, 1333M66G03, 1333M66G07, 1333M66G09, 1781M53G01,1781M53G02, 1781M53G03, 1781M53G04, 1781M53G06, 1781M53G07, 1781M53G08, 1781M53G09, 1854M95P01, 1854M95P03, 1854M95P04, 1854M95P06, and 1854M95P07, do the following:

Initial Inspection

(1) If the spool has greater than 7,000 CSN on the effective date of this AD and has not already been inspected using one of the ASB's or SB's listed in Column A of Table 9; OR a combination of one procedure from Column B AND one from Column C; OR a combination of one procedure from Column D AND one from Column E, or if the spool has not been inspected using ASB CF6-80C2 S/B 72-A0848, Revision 8, dated October 2, 2002, or anearlier revision of ASB 72-A0848 or SB 72-0848, inspect the hub and bore in accordance with ASB CF6-80C2 S/ B 72-A0812, Revision 4, dated October 2, 2002; and the web and hub- to-web transition areas in accordance with ASB CF6-80C2 S/B 72- A0848, Revision 8, dated October 2, 2002, before further flight.

(2) If the spool has 7,000 or fewer CSN on the effective date of this AD, and has not already been inspected using one of the ASB's or SB's listed in Column A of Table 9; OR a combination of one procedure from Column B and one from Column C; OR a combination of one procedure from Column D and one from Column E, inspect the hub and bore in accordance with ASB CF6-80C2 S/B 72-A0812, Revision 4, dated October 2, 2002, at the earliest of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 3,000 CSN, or

(iii) From July 29, 2001, through January 27, 2003, before 7,000 CSN, and after January 27, 2003, before 3,500 CSN.

(3) If the spool has 7,000 or fewer CSN on the effective date of this AD, and has not already been inspected using ASB CF6-80C2 S/B 72-A0848, Revision 8, dated October 2, 2002, or an earlier revision of ASB 72-A0848 or SB CF6-80C2 72-0848, inspect the web and the web and hub-to-web transition areas in accordance with CF6-80C2 S/B 72- A0848, Revision 8, dated October 2, 2002, at the earliest of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 3,000 CSN, or

(iii) From July 29, 2001, through July 28, 2003, before 7,000 CSN and after July 28, 2003, before 3,500 CSN.

(4) For spools that have not been inspected using ASB CF6-80C2 S/B 72-A0934, Revision 4, dated October 2, 2002, or an earlier revision of ASB 72-A0934, inspect the stage 3-5 dovetail slot bottom in accordance with the requirements of ASB CF6-80C2 S/B 72-A0934, Revision 4, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) Within 4,000 additional CIS after the effective date of this AD.Repetitive Inspection

(5) For spools that have already been inspected using one of the ASB's or SB's listed in Column A of Table 9; OR a combination of one procedure from Column B and one from Column C; OR a combination of one procedure from Column D and one from Column E, reinspect the hub and bore in accordance with the requirements of ASB CF6-80C2 S/B 72- A0812, Revision 4, dated October 2, 2002, and the web and hub-to-web transition areas in accordance with ASB CF6-80C2 S/B 72-A0848, Revision 8, dated October 2, 2002, at the earlier of:

(i) Each PPE with more than 1,000 CSLI and 3,500 CSN, or

(ii) From July 29, 2001, through January 27, 2003, before the cycle limits of Table 6, and after January 27, 2003, before the cycle limits of Table 5.

Spool Disposition

(6) If inspection findings equal or exceed the reject limits established by ASB CF6-80C2 S/B 72-A0812, Revision 4, dated Revision 4, dated October 2, 2002, or ASB CF6-80C2 S/B 72-A0848, Revision 8, dated October 2, 2002, or ASB CF6-80C2 S/B 72\A0934, Revision 4, dated October 2, 2002; replace spool before further flight.

Spool Reinstallation Limit

(7) After the effective date of this AD, do not install any engine that has an HPCR stage 3-9 spool, P/N's 1333M66G01, 1333M66G03, 1333M66G07, 1333M66G09, 1781M53G01, 1781M53G02, 1781M53G03, 1781M53G04, 1781M53G06, 1781M53G07, 1781M53G08, 1781M53G09, 1854M95P01, 1854M95P03, 1854M95P04, 1854M95P06 and 1854M95P07, installed where the spool has 10,500 or more CSN.

CF6-80C2 8-Inch Billet 2-Piece Spools

(k) For CF6 HPCR stage 3-9 spool, P/N's 1333M66G10, 1781M53G05, 1781M53G010, and 1854M95P08, do the following:

(1) If the spool has not already been inspected using one of the ASB's or SB's listed in Column A of Table 9; OR a combination of one procedure from Column B and one from Column C; OR a combination of one procedure from Column D and one from Column E, inspect hub and bore in accordance with the piece-part level inspection of ASB 72- A0812, Revision 4, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 6,000 CSN.

(2) For spools that have not been inspected using ASB 72-A0848, Revision 8, dated October 2, 2002, or an earlier revision of ASB 72- A0848, or SB 72-0848, inspect the web and hub-to-web transition areas in accordance with the requirements of ASB CF6-80C2 S/B 72- A0848, Revision 8, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 6,000 CSN.

(3) For spools that have not been inspected using ASB CF6-80C2 S/B 72-A0934, Revision 3, dated October 2, 2002, or an earlier revision of ASB 72-A0934, inspect the stage 3-5 dovetail slot bottom in accordance with the requirements of ASB CF6-80C2 S/B 72-A0934, Revision 4, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 6,000 CSN.

Spool Disposition

(4) If inspection findings equal or exceed the reject limits established by ASB CF6-80C2 S/B 72-A0812, Revision 4, dated October 2, 2002, or ASB CF6-80C2 S/B 72-A0848, Revision 8, dated October 2, 2002, or ASB CF6-80C2 S/B 72-A0934, Revision 4, dated October 2, 2002; replace spool before further flight.

CF6-80E1 9&10-Inch Billet Spools

(l) For CF6 HPCR stage 3-9 spool, P/N's 1669M22G01, 1669M22G03, 1782M22G01 and 1782M22G02, do the following:

Initial Inspection

(1) If the spool has greater than 7,000 CSN and has not already been inspected using one of the ASB's listed in Column A of the following Table 10; OR a combination of one procedure from Column B and one from Column C; OR a combination of one procedure from Column D and one from Column E, OR if the spool has not been inspected using ASB CF6-80E1 S/B 72-A0126, Revision 5, dated October 2, 2002, or an earlier revision of ASB 72-A0126, or SB 72-0126, inspect the hub and bore in accordance with ASB CF6-80E1 S/B 72-A0135, Revision 3, dated October 2, 2002; and the web and hub-to-web transition areas in accordance with ASB CF6-80E1 S/B 72-A0126, Revision 5, dated October 2, 2002, before further flight.

Table 10

Procedures (70-32-XX) in standard practices manual GEK9250
CF6-80E1 SB No. Column A
Column B
Column C
Column D
Column E
ASB 72-A0135, dated August 13, 1998.

ASB 72-A0135, Revision 1, dated October 28, 1999.

ASB 72-A0135, Revision 2, dated June 6, 2001.

ASB CF6-80E1 S/B 72-A0135, Revision 3, dated October 2, 2002.

70-32-09, Revision 71, dated October 1, 1995.

70-32-09, Revision 71, dated November 15, 1996.

70-32-09, Revision 74, dated May 1, 1998.

70-32-10, Revision 71, dated October 1, 1995.

70-32-10, Revision 71, dated November 15, 1996.

70-32-10, Revision 74, dated May 1, 1998.

70-32-10, Revision 75, dated December 15, 1998.

70-32-13, Temporary Revision (TR), 70-25, dated August 26, 1996.

70-32-13,Revision 72, dated November 15, 1996.

70-32-13, Revision 73, dated November 1, 1997

70-32-13, Revision 75, dated December 15, 1998.

70-32-13, TR 70-41, dated February 10, 1999 70-31-13, Revision 76, dated May 15, 1999.

70-31-17, TR 70-39, dated December 15, 1998.

70-31-17, Revision 76, dated May 15, 1999.

70-31-17 TR 70-47, dated October 28, 1999.

70-32-14, TR 70-26, dated August 26, 1996.

70-32-14, Revision 71, dated November 15, 1996.

70-32-14, Revision 73, dated November 1, 1997.

70-32-14, Revision 75, dated December 15, 1998.

70-41, TR 70-42, dated February 10, 1999.
70-31-14, Revision 76, dated May 15, 1999.

70-31-18, TR 70-40, dated December 15, 1998.

70-31-18, Revision 76, dated May 15, 1999.

70-31-18 TR 70-48, dated October 28, 1999.

(2) If the spool has 7,000 or fewer CSN and has not already been inspected using one of the ASB's listed in Column A of Table 10; OR a combination of one procedure from Column B and one from Column C; OR a combination of one procedure from Column D and one from Column E, OR if the spool has not been inspected using ASB CF6-80E1 S/B 72- A0126, Revision 5, dated October 2, 2002, or an earlier revision of ASB 72-A0126, or SB 72-0126, inspect the hub and bore in accordance with ASB CF6-80E1 S/B 72-A0135, Revision 3, dated October 2, 2002; and the web and hub-to-web transition areas in accordance with ASB CF6-80E1 S/B 72-A0126, Revision 5, dated October 2, 2002, at the earliest of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 3,000 CSN, or

(iii) From July 29, 2001, through January 27, 2003, before 7,000 CSN, and after January 27, 2003, before 3,500 CSN.

(3) Spools not previously inspected using ASB CF6-80E1 S/B 72- A0137, Revision 4, dated October 2, 2002, or an earlier revision of ASB 72-0137, or SB 72-0137, inspect stage 3-5 dovetail slot bottoms in accordance with the requirements of ASB CF6-80E1 S/B 72-A0137, Revision 4, dated October 2, 2002, at the earliest of:

(i) The first PPE after 1,000 CSN, or

(ii) The first HPCR exposure after 1,000 CSN, or

(iii) The next required inspection to ASB

CF6-80E1 S/B 72-A0135, Revision 3, dated October 2, 2002.

Repetitive Inspection

(4) For spools that have already been inspected using one of the ASB's listed in Column A of Table 10; OR a combination of one procedure from Column B and one from Column C; OR a combination of one procedure from Column D and one from Column E, inspect the hub and bore in accordance with the requirements of ASB CF6-80E1 S/B 72- A0135, Revision 3, dated October 2, 2002, the web and hub-to-web transition areas in accordance with ASB CF6-80E1 S/B 72-A0126, Revision 5, dated October 2, 2002, and the stage 3-5 dovetail slot bottoms in accordance with ASB CF6-80E1 S/B 72-A0137, Revision 4, dated October 2, 2002, at the earlier of:

(i) Each PPE with more than 1,000 CSLI and 3,500 CSN, or

(ii) From July 29, 2001, through January 27, 2003, before the cycle limits of Table 6, and after January 27, 2003, before the cycle limits of Table 5.

Spool Disposition

(5) If inspection findings equal or exceed the reject limits established by ASB CF6-80E1 S/B 72-A0135, Revision 3, dated October 2, 2002; ASB CF6-80E1 S/B 72-A0126, Revision 5, dated October 2, 2002; and ASB CF6-80E1 S/B 72-A0137, Revision 4, dated October 2, 2002; replace spool before further flight.

Spool Reinstallation Limit

(6) After the effective date of this AD, do not install any engine that has an HPCR stage 3-9 spool, P/N's 1669M22G01, 1669M22G03, 1782M22G01, and 1782M22G02, installed where the spool has 10,500 or more CSN.

CF6-80E1 8-Inch Billet 2-Piece Spools

(m) For CF6 HPCR stage 3-9 spool, P/N 1782M22G04, do the following:

(1) If the spool has not already been inspected using one of the ASB's or SB's listed in Column A of the following Table 9; OR a combination of one procedure from Column B and one from Column C; OR a combination of one procedure from Column D and one from Column E, inspect hub and bore in accordance with the piece-part level inspection of ASB CF6-80E1 S/B 72-A0135, Revision 3, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 6,000 CSN.

(2) For spools that have not been inspected using ASB CF6-80E1 S/B 72-A0126, Revision 5, dated October 2, 2002, or an earlier revision of ASB 72-A0126, or SB 72-0126, inspect the web and hub-to- web transition areas in accordance with ASB CF6-80E1 S/B 72-A0126, Revision 5, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 6,000 CSN.

(3) For spools that have not been inspected using ASB CF6-80E1 S/B 72-A0137, Revision 4, dated October 2, 2002, or an earlier revision of ASB 72-A0137, or SB 72-0137, inspect the stage 3-5 dovetail slot bottoms in accordance with ASB CF6-80E1 S/B 72-A0137, Revision 4, dated October 2, 2002, at the earlier of:

(i) The first PPE after 1,000 CSN, or

(ii) The first ESV after 6,000 CSN.

Spool Disposition

(4) If inspection findings equal or exceed the reject limits established by ASB CF6-80E1 S/B 72-A0135, Revision 3, dated October 2, 2002; ASB CF6-80E1 S/B 72-A0126, Revision 5, dated October 2, 2002; and ASB CF6-80E1 S/B 72-A0137, Revision 4, dated October 2, 2002; replace spool before further flight.

Reporting Requirements

(n) Within five calendar days of inspection, report the results of inspections that equal or exceed the reject criteria to: Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive park, Burlington, MA 01803-5299; telephone (781) 238-7147; fax (781) 238-7199. Reporting requirements have been approved by the Office of Management and Budget and assigned OMB control number 2120-0056. Be sure to include the following information:

(1) Part Number.

(2) SerialNumber.

(3) Spool CSN.

(4) Spool CSLI.

(5) Date and location where inspection was done.

Definitions

(o) For the purpose of this AD, the following definitions apply:

(1) A module level exposure is a separation of the fan module from the engine.

(2) An HPC rotor exposure is a HPC top or bottom case removal.

(3) A PPE is a disassembly and removal of the stage 3-9 spool from the HPCR structure, regardless of any blades, locking lugs, bolts or balance weights assembled to the spool.

(4) An ESV is the introduction of an engine into the shop where the separation of a major engine flange will occur after the effective date of this AD.

(5) The following maintenance actions, or any combination, are not considered ESV's for requiring repeat inspections:

(i) Introduction of an engine into a shop solely for removal of the compressor top or bottom case for airfoil maintenance or variable stator vane bushing replacement.

(ii) Introduction ofan engine into a shop solely for removal or replacement of the Stage 1 Fan Disk.

(iii) Introduction of an engine into a shop solely for replacement of the Turbine Rear Frame.

(iv) Introduction of an engine into a shop solely for replacement of the Accessory and/or Transfer Gearboxes.

(v) Introduction of an engine into a shop solely for replacement of the Fan Forward Case.

Alternative Methods of Compliance

(p) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Engine Certification Office (ECO). Operators must submit their request through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, ECO.

Note 2: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the ECO.

Special Flight Permits

(q) Special flight permits may be issued in accordance with Sec. Sec. 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be done.

Documents That Have Been Incorporated By Reference

(r) The inspections must be done in accordance with the following GE Aircraft Engines alert service bulletins (ASB's):

Document No.
Pages
Revision
Date
ASB CF6-50 S/B 72-A1108.
Total pages: 7
ASB CF6-50 S/B 72-A1131
Total pages: 43.
ASB CF6-50 S/B 72-A1157
Total pages: 38
ASB CF6-80A S/B 72-A0678
Total pages: 7
ASB CF6-80A S/B 72-A0691
Total pages: 43
ASB CF6-80A S/B 72-A0719
Total pages: 38
ASB CF6-80C2 S/B 72-A0812
Total pages: 6
ASB CF6-80C2 S/B 72-A0848
Total pages: 43
ASB CF6-80C2 S/B 72-A0934
Total pages: 38
ASB CF6-80E1 S/B 72-A0126
Total pages: 44
ASB CF6-80E1 S/B 72-A0135
Total pages: 6
ASB CF6-80E1 S/B 72-A0137
Total pages: 38
All

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AllAll

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5

4

4

5

5

5

4

8

4

5

3

4

October 2, 2002.
Do

Do

Do

Do

Do

Do

Do

Do

Do

Do

Do

This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from General Electric Company via Lockheed Martin Technology Services, 10525 Chester Road, Suite C, Cincinnati, Ohio 45215, telephone (513) 672-8400, fax (513) 672- 8422. Copies may be inspected at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the

Effective Date

(s) This amendment becomes effective on January 23, 2003.

A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) by superseding AD 95-18-14, Amendment 39-9361 (60 FR 46216, September 6, 1995); AD 99-24-15, Amendment 39-11440 (64 FR 66554, November 29, 1999); and AD 2000-16-12, Amendment 39-11868 (65 FR 50623, August 21, 2000); which are applicable to GE CF6-45, -50, -80A, -80C2, and -80E1 turbofan engines, was published in the Federal Register on June 12, 2002, (67 FR 40239). That action proposed to combine the requirements of AD 99-24-15 and AD 2000- 16-12 with the following additional changes to:

Adopt the accelerated initial inspection requirements of AD 2000-16-12 to spools acquiring 7,000 cycles-since-new (CSN) or more in service after July 28, 2001,

Relax initial compliance requirement for the CF6-45, -50, and CF6-80A 13-inch billet spools to make them consistent with 9 and 10-inch billet spools,

Add repetitive inspection requirements to the existing one- time inspection requirement for the CF6-80C and -80E series engine spool web and hub-to-web transition areas,

Replace engine shop visit inspection threshold limits for certain spools with cyclic limits,

Add a time limit for slot bottom inspection for 13-inch billet spools for CF6-45, -50, -80A engines and for 9-inch and 10-inch billet spools for CF6-45, -50, -80A, and -80C engines,

Add a time limit for the initial inspection and add repeat inspection intervals for stage 3-5 slot bottom inspection for certain spools,

Add a time limit for one-time inspection of 8-inch billet 2-piece spools, and

Provide for an alternative modular inspection for the slot bottoms.

The action was prompted by a report of an uncontained failure of an HPCR 3-9 spool.

The inspections must be done in accordance with the following GE alert service bulletins (ASB's):

ASB GE CF6-50 S/B 72-A1108, Revision 5, dated October 2, 2002.

ASB GE CF6-50 S/B 72-A1131, Revision 4, dated October 2, 2002.ASB GE CF6-50 S/B 72-A1157, Revision 4, dated October 2, 2002.

ASB GE CF6-80A S/B 72-A0678, Revision 5, dated October 2, 2002.

ASB GE CF6-80A S/B 72-A0691, Revision 5, dated October 2, 2002.

ASB GE CF6-80A S/B 72-A0719, Revision 5, dated October 2, 2002.

ASB GE CF6-80C2 S/B 72-A0812, Revision 4, dated October 2, 2002.

ASB GE CF6-80C2 S/B 72-A0848, Revision 8, dated October 2, 2002.

ASB GE CF6-80C2 S/B 72-A0934, Revision 4, dated October 2, 2002.

ASB GE CF6-80E1 S/B 72-A0135, Revision 3, dated October 2, 2002.

ASB GE CF6-80E1 S/B 72-A0126, Revision 5, dated October 2, 2002.

ASB GE CF6-80E1 S/B 72-A0137, Revision 4, dated October 2, 2002.

Comments

Interested persons have been afforded an opportunity to participate in the making of this amendment. Due consideration has been given to the comments received.

Web Inspection May Require Unscheduled Removals of Engines

Several commenters state that inspection of the web per Alert Service Bulletin 72-A0848, after January 27, 2003, at 3,500 CSN is a decrease from inspection requirements prior to that date. The commenters feel that this requirement will force operators to remove engines off wing to do the inspection in order to comply with this proposed AD.

The FAA agrees. Based on information received from several commenters, this requirement will have an adverse economic and operational impact on several operators. We have reviewed a risk analysis that includes an extension of the web inspection requirement by six months, relative to the date proposed in the NPRM, and find that the new risk is still acceptable under the guidelines appropriate for this type of failure. As a result, the requirement has been extended by six months.

Request To Add a FAX Number for the Reporting Requirements

One commenter requests that a FAX number be added to the reporting requirements. Due to time differences around the world, the time allotted for reporting may not be sufficient for other means of communication
The FAA agrees. We have added a facsimile number to the reporting requirements.

Request To Make Editorial Changes to Wording in the Requirements of the AD

One commenter requests certain word changes, such as replacing ``by'' with ``at'', replacing ``within'' with ``before'', etc., and adding certain paragraph headings. These changes are requested to make the AD requirements consistent and more understandable.

The FAA partially agrees. We consider the consistency of wording and the readability of the requirements of the AD to be of highest concern. However, we also feel that many of the suggested changes are stylistic and do not affect the technical accuracy or readability of the AD. We have made some of the requested changes to ensure consistency among the requirements and to improve the readability of the requirements of the AD.

Requested Corrections to CF6-50 8-Inch Requirements

Several commenters request that the title for paragraph (d) be corrected from ``CF6-508-inch'' to ``CF6-50 8-inch.'' The same commenters also request that the FAA correct service bulletin identifications in paragraphs (f), (g), and (j).

The FAA agrees. The title for paragraph (d) and the service bulletin numbers in paragraphs (f), (g), and (j) have been corrected.

Request To Change the Definition of an Engine Shop Visit

Several commenters request that the definition of an engine shop visit be changed to exclude compressor top and bottom case removals for variable stator vane bushing replacements. The commenters feel the inclusion was made to add another condition to the conditions already identified as not constituting engine shop visits (ESV's).

The FAA agrees. We have changed the ESV definition paragraph to exclude the induction of an engine into the shop for the purpose of replacing the variable stator vane bushing.

Requested Clarification of the Requirements for Reinstallation of CF6- 50 SpoolsOne commenter feels that further explanation on the meaning of paragraph (c)(7) is needed.

The FAA agrees. Addition of a heading ``Spool Reinstallation Limit'' in this paragraph helps in clarifying the intent of this paragraph. Furthermore, as the paragraph states, an engine with a spool that has 10,500 CSN or more may not be installed (i.e. returned to service). The paragraph does not require the removal of an installed engine that has a spool with 10,500 CSN or more.

Request To Clarify Paragraph (a)(3)(ii) of This AD

One commenter requests clarification of paragraph (a)(3)(ii). The commenter feels that paragraph (a)(3)(ii) is necessary to do paragraphs (a)(3)(i) and (a)(3)(iii). The commenter feels that paragraphs (a)(3)(i) and (a)(3)(iii) are redundant to (a)(3)(ii) and can be deleted to simplify the requirements.

The FAA does not agree with deleting paragraphs (a)(3)(i) and (a)(3)(iii). A spool that is exposed as a piece part (paragraph (a)(3)(i)) is also exposed as a rotor (paragraph (a)(3)(ii)). Likewise, a spool that requires a hub inspection in accordance with ASB CF6-50 S/ B 72-A1108 hub inspection (paragraph (a)(3)(iii)) must be exposed at least to a rotor level {(a)(3)(ii){time} in order to do a module level inspection. In this sense, (a)(3)(i) and (a)(3)(iii) are redundant to (a)(3)(ii). However, each condition represents a common but distinct and different level of planned engine maintenance, therefore it was advisable to address each condition specifically for clarity.

Request To Clarify That Paragraph (a)(4)(iii) Is Correct

One commenter requests that the FAA verify that paragraph (a)(4)(iii) and Table 5 are correct. The commenter feels that Table 5 of the AD causes a jump in the inspection interval. The commenter provides a correction to Table 5 of the AD to correct a perceived error in that Table.

The FAA has not been able to confirm the commenter's findings. The cyclic intervals for the Table 5 requirements areA; 3,500 cycles, B; 3,000 cycles, C; 3,000 cycles, D; 2,500 cycles, E; 2,500 cycles, F; 2,000 cycles, and G; 2,000 cycles. These intervals are as intended.

Concern About Misinterpretation of the Inspection Deadline

One commenter states that one of the requirements of this proposed rule may be misread as extending the inspection deadline of AD 2000-16- 12 to beyond July 28, 2001. The commenter also suggests that if all the high-risk spools have been inspected, the proposed rule should be expedited, since one year has passed since the deadline of AD 2000-16- 12.

The FAA agrees with the commenter on the need to expedite issuance of this AD. While the statement in the Discussion Section of the preamble of the proposal may be misinterpreted, the preamble is not regulatory and in fact, even the structure of the preamble changes when an NPRM is converted into a final rule. However, we have made changes to the statement in the Supplementary Information section to clarify the intent of this final rule. The intent of the proposed rule is to apply the same requirement on the population of the spools that would acquire 7,000 CSN after July 28, 2001. In regard to the comment inquiring if all spools have been inspected, we are not aware of any spool with 7,000 CSN or more that has not been inspected as required by AD 2000-16-12.

Request To Include Fluorescent Penetrant Inspection (FPI) Requirements

One commenter suggests that AD 95-18-14 that addresses FPI of the 3-9 spool should be included, since Standard Practices are only a suggestion and not a law. The commenter makes this comment out of concern that under this proposed rule the benefit of an additional inspection is eliminated.

The FAA does not agree. The requirements promulgated by AD 95-18-14 ensure that a spool is properly wetted internally prior to the FPI. Although FPI of the 3-9 spool is desired for the areas not affected by this AD, FPI is not the best technique for the inspection programestablished by this AD. While FPI is effective only for detection of surface cracks, the combination of ultrasonic and eddy current inspections required by this AD provide both surface and subsurface inspections that are of equal or greater sensitivity than FPI. The FPI required by AD 95-18-14 was an emergency measure instituted in 1995 after discovery of cracking in the disk web area, an area not then covered by ultrasonic and eddy current inspections. These inspection methods were subsequently developed and incorporated into the inspection plan. Additionally, AD 95-18-14 did not prescribe inspection intervals, only inspection techniques, therefore, the benefit of AD 95- 18-14 was not considered in the risk analysis associated with the current AD's.

Additional Spool Part Numbers (P/N's) as a Result of Unrelated Repairs

One commenter expresses a concern that additional spool P/N's, which have been generated due to unrelated repairs on spools that are subject to the inspectionrequirements of this AD, are not being captured by the AD. The commenter feels that these P/N's should be added to the AD. The commenter raises this issue to ensure that spools with P/N's that were not included in the proposed rule are not excluded from this inspection program.

The FAA agrees. The new P/N's will be incorporated in this AD. However, their incorporation does not increase the originally affected spool population size.

New Revisions to the Applicable Service Bulletins

One commenter, the manufacturer, advises the FAA that the applicable service bulletins may be revised for nontechnical reasons. The commenter feels that the latest revisions of the service bulletins need to be incorporated into the AD.

The FAA agrees. The revision numbers and dates have been incorporated into this final rule.

Request To Change Paragraph (j)(2)

One commenter requests that paragraph (j)(2) be changed to ensure that the hub and web receive an initial inspection if either of the two areas were not previously inspected. The same commenter suggests that paragraph (j)(2) be split into two paragraphs to properly specify the inspection deadlines for the hub and for the web, now that the originally proposed deadlines have been changed to accommodate the economic and operational burden associated with the web inspection.

The FAA agrees. We have changed paragraph (j)(2) of this AD. Because of the new schedule requirements, two paragraphs, each with its own schedule, are appropriate and the change has been made.

Request To Clarify ``Replace Before Further Flight'' Requirement on CF6-50 Spools

One commenter observes that the ``replace before further flight'' requirements for the CF6-50 spools include the reject limits of service bulletin CF6-50 S/B 72-A1131, while the preceding paragraph does not include this service bulletin. The commenter raised this comment out of concern that the inspection requirement per service bulletin CF6-50 S/B 72-A1131 was not identified in the preceding step.

The FAA partially agrees. In the current text, an inference may be made that spools must be inspected to all three referenced bulletins at each repeat inspection. The spool disposition requirements apply to results of all prescribed inspections specified in all the steps of the pertinent paragraph in the AD and not just to the preceding step. Therefore, for further clarification a heading ``Spool Disposition'' has been inserted.

Request To Add a Heading of ``Spool Reinstallation Limit''

One commenter requests that the heading Spool Reinstallation Limit be added before the applicable paragraphs. The commenter feels that the addition will clarify the intent of the paragraphs.

The FAA agrees. We have added the heading to the applicable paragraphs.

Concern Over the Availability of Training and Equipment

One commenter expresses concern that the requirements of ASB CF6- 80C2 72-A0934, Revision 3, can not be done becausethe equipment and training necessary to carry out this inspection are not available at this time. The commenter makes this comment out of concern that the prescribed inspections could not be done, per the proposed rule timetables, since there was no scheduled delivery of the necessary equipment and associated training.

The FAA agrees. However, this issue has been addressed by the engine manufacturer. Both equipment and training will be available in time to enable the commenter to comply with the requirements of this AD, therefore, no changes have been made.

Request To Change the Definition of a Shop Visit

One commenter states that the introduction of an engine into the shop solely for the 3-9 spool inspection should not be considered a shop visit. The request is made so that the stage 3-5 dovetail slot bottom inspection for the CF6-80C2 13-inch billet spools would not be forced if the spools could otherwise comply using the module level inspection. The hub and web inspections can be done at module level merely by removing the fan module from the core. The slot bottom inspection requires additional disassembly to remove the compressor top case. The request is made to avoid this additional disassembly.

The FAA disagrees. Material testing and stress analysis indicate that the dovetail slot bottoms have a dwell-fatigue limitation. Accordingly, the rule requires initial slot bottom inspection at the earliest exposure (piece-part exposure or rotor exposure, which is realized upon top case removal) but not later than the next required inspection of the hub and/or web for dwell fatigue cracking. As the cracking mode is the same for all areas, the FAA can not apply lesser criteria to the slot bottoms.

Request To Include the 3-5 Dovetail Slot Bottom Inspection at Piece- Part Level Only

One commenter requests that the repeat inspection of the CF6-80C 13-inch billet spool stage 3-5 dovetail slot bottoms be required at piece-part exposure only. Accomplishment of this inspection at a module level would require, at a minimum, the removal of the compressor top case.

The FAA disagrees for reasons stated in the answer to the previous comment.

Request To Clarify the Reference Date for the Initial Inspection

One commenter states that there is no reference date for the initial inspection required in paragraph (a)(3) from which the operator is to determine items (i), (ii), and (iii) under this paragraph. The commenter uses the example that item (i) requires an inspection at the first piece-part exposure (PPE) after 1,000 CSN. The spool may have had several PPE's after 1,000 CSN in its life but never had the requirement to inspect at those visits. The commenter requests clarification of the reference date in this paragraph to ensure the proper time set.

The FAA disagrees. The proposal does not contain new requirements. It consolidates requirements of existing airworthiness directives, which include paragraph (a)(3). In the past, if an opportunity to have a PPE arose as the commenter states, the requirement of AD 99-24-15 would have been applicable. Additionally, the cyclic requirements of steps (i) and (ii) are associated with the cyclic life of the spool and not an independent cyclic interval. The third step (iii) also does not need the association with the effective date of this AD. Incorporation of the change the commenter proposes would conflict with requirements of the existing AD relative to the dovetail inspection. The proposed change would also affect additional paragraphs of the rule, not identified by the commenter, where similar arguments can be made.

Potential Confusion Over Requirements for Piece-Part Inspections

One commenter, the manufacturer, informs the FAA that a potential for confusion exists regarding the requirements for the one-time hub inspection of 8-inch billet spools. The existing wording in certain ASB's could be interpreted such that a modular level inspection of the hub could be performed, when in fact, piece-part inspection using Procedure A is required to achieve the intended level of safety. The manufacturer has revised the appropriate ASB's to add this clarification and suggests additional wording be added to this rule to ensure the correct procedure is used.

The FAA agrees. We have clarified the hub inspection requirements for affected spools in paragraphs (d)(1), (h)(1), (k)(1), and (m)(1).

Request To Correct P/N's and SN's for CF6-50 16-Inch and 13-Inch Billets

The same commenter states that the part number and serial number relationships for the CF6-50 16-inch and 13-inch billet spools relative to Table 2 were incorrect in the information that it sent to the FAA and need to be corrected in paragraphs (a) and (b), respectively.

The FAA agrees. We have made the appropriate changes to the final rule.

After careful review of the available data, including the comments noted above, the FAA has determined that air safetyand the public interest require the adoption of the rule with the changes described previously. The FAA has determined that these changes will neither increase the economic burden on any operator nor increase the scope of the AD.

Cost Analysis

There are approximately 3,147 engines of the affected design in the worldwide fleet. The FAA estimates that 1,289 engines installed on airplanes of U.S. registry would be affected by this proposed AD. The FAA also estimates that it would take approximately 238 work hours per engine to perform the proposed actions. The average labor rate is $60 per work hour. Required parts would cost approximately $35,000 per engine. In addition, because of the previous AD actions, the FAA estimates that only 72 percent (928 engines) of the engines installed on airplanes of U.S. registry would be affected. Based on these figures, the total cost of the proposed AD on U.S. operators is estimated to be $45,731,840.

Regulatory Analysis

This final rule does not have federalism implications, as defined in Executive Order 13132, because it would not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government. Accordingly, the FAA has not consulted with state authorities prior to publication of this final rule.

For the reasons discussed above, I certify that this action (1) is not a ``significant regulatory action'' under Executive Order 12866; (2) is not a ``significant rule'' under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and (3) will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. A final evaluation has been prepared for this action and it is contained in the Rules Docket. A copy of it may be obtained by contacting the Rules Docket at the location provided under the caption ADDRESSES.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

Adoption of the Amendment

Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows:

PART 39--AIRWORTHINESS DIRECTIVES

1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

Sec. 39.13 [Amended]

2. Section 39.13 is amended by removing Amendments 39-9361 (60 FR 46216, September 6, 1995), 39-11440 (64 FR 66554, November 29, 1999), and 39-11868 (65 FR 50623, August 21, 2000), and by adding a new airworthiness directive, Amendment 39-12984, to read as follows: