AD 2005-17-16 ACTIVE

The FAA is adopting a new airworthiness directive (AD) for Pratt & Whitney (PW) JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 turbofan engines. This AD requires removing affected rotating parts overhauled by a certain repair vendor, and inspecting the parts as applicable. This AD results from reports that certain JT8D critical life-limited rotating parts have been returned to service with cracks, corrosion pitting, or dimensions outside of manual limits. We are issuing this AD to prevent failure of critical life-limited rotating engine parts which could result in an uncontained engine failure and damage to the airplane.

Final rule.

2005-17-16 Pratt & Whitney: Amendment 39-14237. Docket No. FAA-2004- 19929; Directorate Identifier 2004-NE-15-AD.

Effective Date

(a) This airworthiness directive (AD) becomes effective September 30, 2005.

Affected ADs

(b) None.

Applicability

(c) This AD applies to Pratt & Whitney (PW) JT8D-1, -1A, -1B, - 7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 turbofan engines. These engines are installed on, but not limited to, Boeing 727 and 737 series, and McDonnell Douglas DC-9 series and MD-80 series airplanes.

Unsafe Condition

(d) This AD results from reports that certain JT8D critical life-limited rotating parts have been returned to service with cracks, corrosion pitting, or dimensions outside of manual limits. We are issuing this AD to prevent failure of critical life-limited rotating engine parts, which could result in an uncontained engine failure and damage to the airplane.

Compliance

(e)You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.

Inspect Parts

(f) Remove all coating from the disks and hubs identified in Tables 1 and 2 of this AD and visually, dimensionally, and nondestructively inspect the parts using the inspection criteria listed in the Accomplishment Instructions portion of PW Alert Service Bulletin (ASB) No. JT8D A6442, dated April 4, 2003:

(1) At the next shop visit after the effective date of this AD, but no later than March 31, 2008, for all parts listed in Table 1, and,

(2) At next part accessibility for all parts listed in Table 2.

Table 1.--Affected Compressor Disks and Hubs

SN
P/N
Description
B207AA0072
774407
DISK COMPRESSOR, 7TH STAGE.
B207AA0185
774407
DISK COMPRESSOR, 7TH STAGE.
B207AA0265
774407
DISK COMPRESSOR, 7TH STAGE.
B207AA0307
774407
DISK COMPRESSOR, 7TH STAGE
B207AA0390
774407
DISK COMPRESSOR, 7TH STAGE.
B207AA0602
774407
DISK COMPRESSOR, 7TH STAGE.
BENCAH2848
774407
DISK COMPRESSOR, 7TH STAGE.
BENCAJ5251
774407
DISK COMPRESSOR, 7TH STAGE.
BENCAJ8447
774407
DISK COMPRESSOR, 7TH STAGE.
BENCAJ8508
774407
DISK COMPRESSOR, 7TH STAGE.
BENCAK1906
774407
DISK COMPRESSOR, 7TH STAGE.
BENCAK5073
774407
DISK COMPRESSOR, 7TH STAGE.
BENCAK6015
774407
DISK COMPRESSOR, 7TH STAGE.
BENCAK6588
774407
DISK COMPRESSOR, 7TH STAGE.
G83339
774407
DISK COMPRESSOR, 7TH STAGE.
H29725
774407
DISK COMPRESSOR, 7TH STAGE.
J39323
774407
DISK COMPRESSOR, 7TH STAGE.
J66757
774407
DISK COMPRESSOR, 7TH STAGE.
J93566
774407
DISK COMPRESSOR, 7TH STAGE.
K72131
774407
DISK COMPRESSOR, 7TH STAGE.
L24089
774407
DISK COMPRESSOR, 7TH STAGE.
M15351
774407
DISK COMPRESSOR, 7TH STAGE.
M78744
774407
DISK COMPRESSOR, 7TH STAGE.
M88080
774407
DISK COMPRESSOR, 7TH STAGE.
N04693
774407DISK COMPRESSOR, 7TH STAGE.
N24126
774407
DISK COMPRESSOR, 7TH STAGE.
N37768
774407
DISK COMPRESSOR, 7TH STAGE.
N70373
774407
DISK COMPRESSOR, 7TH STAGE.
N88332
774407
DISK COMPRESSOR, 7TH STAGE.
P14777
774407
DISK COMPRESSOR, 7TH STAGE.
P14853
774407
DISK COMPRESSOR, 7TH STAGE.
P54407
774407
DISK COMPRESSOR, 7TH STAGE.
P60411
774407
DISK COMPRESSOR, 7TH STAGE.
R02963
774407
DISK COMPRESSOR, 7TH STAGE.
R02983
774407
DISK COMPRESSOR, 7TH STAGE.
R03090
774407
DISK COMPRESSOR, 7TH STAGE.
R12397
774407
DISK COMPRESSOR, 7TH STAGE.
R12398
774407
DISK COMPRESSOR, 7TH STAGE.
R12414
774407
DISK COMPRESSOR, 7TH STAGE.
R12506
774407
DISK COMPRESSOR, 7TH STAGE.
R12527
774407
DISK COMPRESSOR, 7TH STAGE.
R19285
774407
DISK COMPRESSOR, 7TH STAGE.
R19423
774407
DISK COMPRESSOR, 7TH STAGE.
R19466
774407
DISK COMPRESSOR, 7TH STAGE.
R31288
774407
DISK COMPRESSOR, 7TH STAGE.

SNP/N
Description
R31356
774407
DISK COMPRESSOR, 7TH STAGE.
R37429
774407
DISK COMPRESSOR, 7TH STAGE.
R57637
774407
DISK COMPRESSOR, 7TH STAGE.
R57707
774407
DISK COMPRESSOR, 7TH STAGE.
R72163
774407
DISK COMPRESSOR, 7TH STAGE.
R81448
774407
DISK COMPRESSOR, 7TH STAGE.
R81455
774407
DISK COMPRESSOR, 7TH STAGE.
R90915
774407
DISK COMPRESSOR, 7TH STAGE.
S05602
774407
DISK COMPRESSOR, 7TH STAGE.
S13909
774407
DISK COMPRESSOR, 7TH STAGE.
S13945
774407
DISK COMPRESSOR, 7TH STAGE.
S14021
774407
DISK COMPRESSOR, 7TH STAGE.
S14057
774407
DISK COMPRESSOR, 7TH STAGE.
S14083
774407
DISK COMPRESSOR, 7TH STAGE.
S14112
774407
DISK COMPRESSOR, 7TH STAGE.
S36685
774407
DISK COMPRESSOR, 7TH STAGE.
S36696
774407
DISK COMPRESSOR, 7TH STAGE.
S36760
774407
DISK COMPRESSOR, 7TH STAGE.
S36882
774407
DISK COMPRESSOR, 7TH STAGE.
S37210
774407
DISK COMPRESSOR, 7TH STAGE.
S37330
774407DISK COMPRESSOR, 7TH STAGE.
S37334
774407
DISK COMPRESSOR, 7TH STAGE.
S37351
774407
DISK COMPRESSOR, 7TH STAGE.
S37384
774407
DISK COMPRESSOR, 7TH STAGE.
T04464
774407
DISK COMPRESSOR, 7TH STAGE.
T04520
774407
DISK COMPRESSOR, 7TH STAGE.
T04635
774407
DISK COMPRESSOR, 7TH STAGE.
T04674
774407
DISK COMPRESSOR, 7TH STAGE.
T04725
774407
DISK COMPRESSOR, 7TH STAGE.
T04770
774407
DISK COMPRESSOR, 7TH STAGE.
T04778
774407
DISK COMPRESSOR, 7TH STAGE.
T04841
774407
DISK COMPRESSOR, 7TH STAGE.
T04965
774407
DISK COMPRESSOR, 7TH STAGE.
T05018
774407
DISK COMPRESSOR, 7TH STAGE.
BENCAP1838
815607
DISK COMPRESSOR, 7TH STAGE.
BENCAP5647
815607
DISK COMPRESSOR, 7TH STAGE.
B207AA0127
5006007 01
DISK COMPRESSOR, 7TH STAGE.
BENCAK9663
5006007 02
DISK COMPRESSOR, 7TH STAGE.
BENCAL3896
5006007 02
DISK COMPRESSOR, 7TH STAGE.
BENCAL5171
5006007 02
DISK COMPRESSOR, 7TH STAGE.
BENCAM1583
5006007 02
DISK COMPRESSOR, 7TH STAGE.
BENCAM3953
5006007 02
DISK COMPRESSOR, 7TH STAGE.
BENCAM8359
5006007 02
DISK COMPRESSOR, 7TH STAGE.
BENCAM8385
5006007 02
DISK COMPRESSOR, 7TH STAGE.
BENCAN5764
5006007 02
DISK COMPRESSOR, 7TH STAGE.
BENCAN5857
5006007 02
DISK COMPRESSOR, 7TH STAGE.
2B7763
738308
DISK COMPRESSOR, 8TH STAGE.
B208AA0063
748608
DISK COMPRESSOR, 8TH STAGE.
B208AA0075
748608
DISK COMPRESSOR, 8TH STAGE.
BENCAM3705
748608
DISK COMPRESSOR, 8TH STAGE.
BENCAP0649
748608
DISK COMPRESSOR, 8TH STAGE.
BENCAP1082
748608
DISK COMPRESSOR, 8TH STAGE.
G62633
748608
DISK COMPRESSOR, 8TH STAGE.
H64242
748608
DISK COMPRESSOR, 8TH STAGE.
H64541
748608
DISK COMPRESSOR, 8TH STAGE.
J27080
748608
DISK COMPRESSOR, 8TH STAGE.
M54597
748608
DISK COMPRESSOR, 8TH STAGE.
N84400
748608
DISK COMPRESSOR, 8TH STAGE.
P26132
748608
DISK COMPRESSOR, 8TH STAGE.
P28454
748608
DISK COMPRESSOR, 8TH STAGE.
P28525
748608
DISK COMPRESSOR, 8TH STAGE.
P28529
748608
DISK COMPRESSOR, 8TH STAGE.
P28610
748608
DISK COMPRESSOR, 8TH STAGE.
R18442
748608
DISK COMPRESSOR, 8TH STAGE.
R44993
748608
DISK COMPRESSOR, 8TH STAGE.
R45505
748608
DISK COMPRESSOR, 8TH STAGE.
R74513
748608
DISK COMPRESSOR, 8TH STAGE.
S01111
748608
DISK COMPRESSOR, 8TH STAGE.
S19131
748608
DISK COMPRESSOR, 8TH STAGE.
S50698
748608
DISK COMPRESSOR, 8TH STAGE.
S50793
748608
DISK COMPRESSOR, 8TH STAGE.
S78019
748608
DISK COMPRESSOR, 8TH STAGE.

SN
P/N
Description
BENCAP4498
815608
DISK COMPRESSOR, 8TH STAGE.
BENCAP4505
815608
DISK COMPRESSOR, 8TH STAGE.
BENCAR1361
815608
DISK COMPRESSOR, 8TH STAGE.
BENCAR1363
815608
DISK COMPRESSOR, 8TH STAGE.
BENCAR1367
815608
DISK COMPRESSOR, 8TH STAGE.
R91483
5005808 01
DISK COMPRESSOR, 8TH STAGE.
T03355
5005808 01
DISK COMPRESSOR, 8TH STAGE.
M33420
787008
HUB REAR COMPRESSOR, FRONT.
N06209
787008
HUB REAR COMPRESSOR, FRONT.
N33004
787008
HUB REAR COMPRESSOR, FRONT.
N33349
787008
HUB REAR COMPRESSOR, FRONT.
N33420
787008
HUB REAR COMPRESSOR, FRONT.
N34154
787008
HUB REAR COMPRESSOR, FRONT.
N90416
787008
HUB REAR COMPRESSOR, FRONT.
N90658
787008
HUB REAR COMPRESSOR, FRONT.
B228AA0190
787208
HUB REAR COMPRESSOR, FRONT.
B228AA0194
787208
HUB REAR COMPRESSOR, FRONT.
B228AA1021
787208
HUB REAR COMPRESSOR, FRONT.
BENCAH0967
787208
HUB REAR COMPRESSOR, FRONT.
BENCAH0969
787208
HUB REAR COMPRESSOR, FRONT.
BENCAK0069
787208
HUB REAR COMPRESSOR, FRONT.
BENCAK8767
787208
HUB REAR COMPRESSOR, FRONT.
BENCAL2504
787208
HUB REAR COMPRESSOR, FRONT.
BENCAM2701
787208
HUB REAR COMPRESSOR, FRONT.
BENCAN0012
787208
HUB REAR COMPRESSOR, FRONT.
BENCAN1226
787208
HUB REAR COMPRESSOR, FRONT.
BENCAN3008
787208
HUB REAR COMPRESSOR, FRONT.
P43696
787208
HUB REAR COMPRESSOR, FRONT.
P43934
787208
HUB REAR COMPRESSOR, FRONT.
P43948
787208
HUB REAR COMPRESSOR, FRONT.
P44411
787208
HUB REAR COMPRESSOR, FRONT.
P45017
787208
HUB REAR COMPRESSOR, FRONT.
P45277
787208
HUB REAR COMPRESSOR, FRONT.
P45459
787208
HUB REAR COMPRESSOR, FRONT.
P45544
787208
HUB REAR COMPRESSOR, FRONT.
R23166
787208
HUB REAR COMPRESSOR, FRONT.
R23187
787208
HUB REAR COMPRESSOR, FRONT.
R23277
787208
HUB REAR COMPRESSOR, FRONT.
R23628
787208
HUB REAR COMPRESSOR, FRONT.
R23806
787208
HUB REAR COMPRESSOR, FRONT.
R24209
787208
HUB REAR COMPRESSOR, FRONT.
R24598
787208
HUB REAR COMPRESSOR, FRONT.
R24900
787208
HUB REAR COMPRESSOR, FRONT.
R91415
787208
HUB REAR COMPRESSOR, FRONT.
R91746
787208
HUB REAR COMPRESSOR, FRONT.
R92224
787208
HUB REAR COMPRESSOR, FRONT.
S07564
787208
HUB REAR COMPRESSOR, FRONT.
S07655
787208
HUB REAR COMPRESSOR, FRONT.
S07706
787208
HUB REAR COMPRESSOR, FRONT.
S39160
787208
HUB REAR COMPRESSOR, FRONT.
S39199
787208
HUB REAR COMPRESSOR, FRONT.
S39338
787208
HUB REAR COMPRESSOR, FRONT.
S39741
787208
HUB REAR COMPRESSOR, FRONT.
S39839
787208
HUB REAR COMPRESSOR, FRONT.
S40023
787208
HUB REAR COMPRESSOR, FRONT.
S40043
787208
HUB REAR COMPRESSOR, FRONT.
B228AA0261
792038
HUB REAR COMPRESSOR, 8TH STAGE.
B228AA0566
792038
HUB REAR COMPRESSOR, 8TH STAGE.
BENCAK8279
792038
HUB REAR COMPRESSOR, 8TH STAGE.
M41870
792038
HUB REAR COMPRESSOR, 8TH STAGE.
N89470
797938
HUB REAR COMPRESSOR, 8TH STAGE.
BENCAP5753
815708
HUB REAR COMPRESSOR, 8TH STAGE.
BENCAR5454
815708
HUB REAR COMPRESSOR, 8TH STAGE.
BENCAR5458
815708
HUB REAR COMPRESSOR, 8TH STAGE.
BENCAR5500
815708
HUB REAR COMPRESSOR, 8TH STAGE.
BENCAR0387
815808
HUB REAR COMPRESSOR, 8TH STAGE.
G79931
701509
DISK COMPRESSOR, 9TH STAGE.
H12008
701509
DISK COMPRESSOR, 9TH STAGE.
H85014
701509
DISK COMPRESSOR, 9TH STAGE.
J24173
701509
DISK COMPRESSOR, 9TH STAGE.
J89012
701509
DISK COMPRESSOR, 9TH STAGE.
L31210
701509
DISK COMPRESSOR, 9TH STAGE.

SN
P/N
Description
M84244
701509
DISK COMPRESSOR, 9TH STAGE.
M84648
701509
DISK COMPRESSOR, 9TH STAGE.
N03018
701509
DISK COMPRESSOR, 9TH STAGE.
N209AA0003
701509
DISK COMPRESSOR, 9TH STAGE.
N209AA0021
701509
DISK COMPRESSOR, 9TH STAGE.
N209AA0108
701509
DISK COMPRESSOR, 9TH STAGE.
N209AA0110
701509
DISK COMPRESSOR, 9TH STAGE.
N209AA0120
701509
DISK COMPRESSOR, 9TH STAGE.
N209AA0251
701509
DISK COMPRESSOR, 9TH STAGE.
N209AA0254
701509
DISK COMPRESSOR, 9TH STAGE.
N209AA0339
701509
DISK COMPRESSOR, 9TH STAGE.
N209AA0465
701509
DISK COMPRESSOR, 9TH STAGE.
N209AA0613
701509
DISK COMPRESSOR, 9TH STAGE.
N41318
701509
DISK COMPRESSOR, 9TH STAGE.
N97641
701509
DISK COMPRESSOR, 9THSTAGE.
N97777
701509
DISK COMPRESSOR, 9TH STAGE.
N98300
701509
DISK COMPRESSOR, 9TH STAGE.
N98342
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH0026
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH0145
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH0196
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH0311
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH0558
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH0686
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH0808
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH1372
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH1462
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH1787
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH2157
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH2310
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH2618
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH2744
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH2754
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH2812
701509
DISK COMPRESSOR, 9TH STAGE.
NENCAH3172
701509
DISK COMPRESSOR, 9TH STAGE.
P11727
701509
DISK COMPRESSOR, 9TH STAGE.
P51543
701509
DISK COMPRESSOR, 9TH STAGE.
P51573
701509
DISK COMPRESSOR, 9TH STAGE.
P51959
701509
DISK COMPRESSOR, 9TH STAGE.
P52941
701509
DISK COMPRESSOR, 9TH STAGE.
P98658
701509
DISK COMPRESSOR, 9TH STAGE.
P98768
701509
DISK COMPRESSOR, 9TH STAGE.
R17612
701509
DISK COMPRESSOR, 9TH STAGE.
R17753
701509
DISK COMPRESSOR, 9TH STAGE.
R17770
701509
DISK COMPRESSOR, 9TH STAGE.
R18740
701509
DISK COMPRESSOR, 9TH STAGE.
R19009
701509
DISK COMPRESSOR, 9TH STAGE.
R19013
701509
DISK COMPRESSOR, 9TH STAGE.
R45437
701509
DISK COMPRESSOR, 9TH STAGE.
R45449
701509
DISK COMPRESSOR, 9TH STAGE.
R45875
701509
DISK COMPRESSOR, 9TH STAGE.
R46726
701509
DISK COMPRESSOR, 9TH STAGE.
R72945
701509
DISK COMPRESSOR, 9TH STAGE.
R72960
701509
DISK COMPRESSOR, 9TH STAGE.
R73803
701509
DISK COMPRESSOR, 9TH STAGE.
R73835
701509
DISK COMPRESSOR, 9TH STAGE.
R73941
701509
DISK COMPRESSOR, 9TH STAGE.
S00757
701509
DISK COMPRESSOR, 9TH STAGE.
S00963
701509
DISK COMPRESSOR, 9TH STAGE.
S18823
701509
DISK COMPRESSOR, 9TH STAGE.
S18838
701509
DISK COMPRESSOR, 9TH STAGE.
S18955
701509
DISK COMPRESSOR, 9TH STAGE.
S50282
701509
DISK COMPRESSOR, 9TH STAGE.
S50317
701509
DISK COMPRESSOR, 9TH STAGE.
S50434
701509
DISK COMPRESSOR, 9TH STAGE.
S70079
701509
DISK COMPRESSOR, 9TH STAGE.
S77569
701509
DISK COMPRESSOR, 9TH STAGE.
S77744
701509
DISK COMPRESSOR, 9TH STAGE.
S77764
701509
DISK COMPRESSOR, 9TH STAGE.
T18831
701509
DISK COMPRESSOR, 9TH STAGE.
T27504
701509
DISK COMPRESSOR, 9TH STAGE.
T27506
701509
DISK COMPRESSOR, 9TH STAGE

SN
P/N
Description
T27542
701509
DISK COMPRESSOR, 9TH STAGE.
N41854
772509
DISK COMPRESSOR, 9TH STAGE.
B209AA0643
798509
DISK COMPRESSOR, 9TH STAGE.
BENCAK4407798509
DISK COMPRESSOR, 9TH STAGE.
BENCAK5293
798509
DISK COMPRESSOR, 9TH STAGE.
BENCAK9176
798509
DISK COMPRESSOR, 9TH STAGE.
S79381
798509
DISK COMPRESSOR, 9TH STAGE.
BENCAP5919
815609
DISK COMPRESSOR, 9TH STAGE.
BENCAP8126
815609
DISK COMPRESSOR, 9TH STAGE.
BENCAP7181
815709
DISK COMPRESSOR, 9TH STAGE.
1A9814
701410
DISK COMPRESSOR, 10TH STAGE.
H18187
701410
DISK COMPRESSOR, 10TH STAGE.
B210AA0149
772510
DISK COMPRESSOR, 10TH STAGE.
B210AA0640
772510
DISK COMPRESSOR, 10TH STAGE.
B210AA0909
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAH0262
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAH2166
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAH2273
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAH3784
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAH4152
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAH7481
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAJ9921
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAK0265
772510DISK COMPRESSOR, 10TH STAGE.
BENCAK0436
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAK6513
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAL1628
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAL1639
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAL3371
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAL6369
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAM1250
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAM3804
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAM3921
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAM4098
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAM9868
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAM9908
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAN1150
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAN7151
772510
DISK COMPRESSOR, 10TH STAGE.
H77954
772510
DISK COMPRESSOR, 10TH STAGE.
J70438
772510
DISK COMPRESSOR, 10TH STAGE.
K35562
772510
DISK COMPRESSOR, 10TH STAGE.
K67440
772510
DISK COMPRESSOR, 10TH STAGE.
M61663
772510
DISK COMPRESSOR, 10TH STAGE.
M73696
772510
DISK COMPRESSOR, 10TH STAGE.
M73717
772510
DISK COMPRESSOR, 10TH STAGE.
M73921
772510
DISK COMPRESSOR, 10TH STAGE.
N02011
772510
DISK COMPRESSOR, 10TH STAGE.
N22418
772510
DISK COMPRESSOR, 10TH STAGE.
N80149
772510
DISK COMPRESSOR, 10TH STAGE.
N80717
772510
DISK COMPRESSOR, 10TH STAGE.
N97525
772510
DISK COMPRESSOR, 10TH STAGE.
N98121
772510
DISK COMPRESSOR, 10TH STAGE.
N98502
772510
DISK COMPRESSOR, 10TH STAGE.
P51840
772510
DISK COMPRESSOR, 10TH STAGE.
P51884
772510
DISK COMPRESSOR, 10TH STAGE.
P52230
772510
DISK COMPRESSOR, 10TH STAGE.
P52692
772510
DISK COMPRESSOR, 10TH STAGE.
P53030
772510
DISK COMPRESSOR, 10TH STAGE.
P98173
772510
DISK COMPRESSOR, 10TH STAGE.
R18125
772510
DISK COMPRESSOR, 10TH STAGE.
R18126
772510
DISK COMPRESSOR, 10TH STAGE.
R18219
772510
DISK COMPRESSOR, 10TH STAGE.
R45551
772510
DISK COMPRESSOR, 10TH STAGE.
R45884
772510
DISK COMPRESSOR, 10TH STAGE.
R46585
772510
DISK COMPRESSOR, 10TH STAGE.
R72889
772510
DISK COMPRESSOR, 10TH STAGE.
R74037
772510
DISK COMPRESSOR, 10TH STAGE.
S01333
772510
DISK COMPRESSOR, 10TH STAGE.
S01381
772510
DISK COMPRESSOR, 10TH STAGE.
S19348
772510
DISK COMPRESSOR, 10TH STAGE.
S19418
772510
DISK COMPRESSOR, 10TH STAGE.
S19446
772510
DISK COMPRESSOR, 10TH STAGE.
S19563
772510
DISK COMPRESSOR, 10TH STAGE.

SN
P/N
Description
S50885
772510
DISK COMPRESSOR, 10TH STAGE.
S51060
772510
DISK COMPRESSOR, 10TH STAGE.
S51077
772510
DISK COMPRESSOR, 10TH STAGE.
S70198
772510
DISK COMPRESSOR, 10TH STAGE.
S70221
772510
DISK COMPRESSOR, 10TH STAGE.
S78390
772510
DISK COMPRESSOR, 10TH STAGE.
S78774
772510
DISK COMPRESSOR, 10TH STAGE.
T19111
772510
DISK COMPRESSOR, 10TH STAGE.
T19185
772510
DISK COMPRESSOR, 10TH STAGE.
T28090
772510
DISK COMPRESSOR, 10THSTAGE.
T28130
772510
DISK COMPRESSOR, 10TH STAGE.
T28230
772510
DISK COMPRESSOR, 10TH STAGE.
BENCAP3554
815610
DISK COMPRESSOR, 10TH STAGE.
BENCAP8866
815610
DISK COMPRESSOR, 10TH STAGE.
BENCAP9500
815610
DISK COMPRESSOR, 10TH STAGE.
BENCAR3177
815610
DISK COMPRESSOR, 10TH STAGE.
2A0326
701411
DISK COMPRESSOR, 11TH STAGE.
8Y2537
701411
DISK COMPRESSOR, 11TH STAGE.
B211AA0141
772511
DISK COMPRESSOR, 11TH STAGE.
B211AA0611
772511
DISK COMPRESSOR, 11TH STAGE.
B211AA0838
772511
DISK COMPRESSOR, 11TH STAGE.
B211AA0934
772511
DISK COMPRESSOR, 11TH STAGE.
B211AA1235
772511
DISK COMPRESSOR, 11TH STAGE.
B211AA1315
772511
DISK COMPRESSOR, 11TH STAGE.
B211AA1357
772511
DISK COMPRESSOR, 11TH STAGE.
BENCAH0266
772511
DISK COMPRESSOR, 11TH STAGE.
BENCAH8830
772511
DISK COMPRESSOR, 11TH STAGE.
BENCAK0480
772511
DISK COMPRESSOR, 11TH STAGE.
BENCAK7394
772511
DISK COMPRESSOR, 11TH STAGE.BENCAL2738
772511
DISK COMPRESSOR, 11TH STAGE.
BENCAM2075
772511
DISK COMPRESSOR, 11TH STAGE.
BENCAM7493
772511
DISK COMPRESSOR, 11TH STAGE.
BENCAM7745
772511
DISK COMPRESSOR, 11TH STAGE.
BENCAM7814
772511
DISK COMPRESSOR, 11TH STAGE.
BENCAN3212
772511
DISK COMPRESSOR, 11TH STAGE.
BENCAN7762
772511
DISK COMPRESSOR, 11TH STAGE.
H58198
772511
DISK COMPRESSOR, 11TH STAGE.
J24723
772511
DISK COMPRESSOR, 11TH STAGE.
L55201
772511
DISK COMPRESSOR, 11TH STAGE.
M10783
772511
DISK COMPRESSOR, 11TH STAGE.
M40303
772511
DISK COMPRESSOR, 11TH STAGE.
M61351
772511
DISK COMPRESSOR, 11TH STAGE.
M61382
772511
DISK COMPRESSOR, 11TH STAGE.
M62071
772511
DISK COMPRESSOR, 11TH STAGE.
M73309
772511
DISK COMPRESSOR, 11TH STAGE.
M87068
772511
DISK COMPRESSOR, 11TH STAGE.
N03523
772511
DISK COMPRESSOR, 11TH STAGE.
N41429
772511
DISK COMPRESSOR, 11TH STAGE.
N97351
772511
DISK COMPRESSOR, 11THSTAGE.
N97355
772511
DISK COMPRESSOR, 11TH STAGE.
P03557
772511
DISK COMPRESSOR, 11TH STAGE.
P11649
772511
DISK COMPRESSOR, 11TH STAGE.
P51901
772511
DISK COMPRESSOR, 11TH STAGE.
P52302
772511
DISK COMPRESSOR, 11TH STAGE.
P52553
772511
DISK COMPRESSOR, 11TH STAGE.
P53051
772511
DISK COMPRESSOR, 11TH STAGE.
P66344
772511
DISK COMPRESSOR, 11TH STAGE.
P66429
772511
DISK COMPRESSOR, 11TH STAGE.
P76611
772511
DISK COMPRESSOR, 11TH STAGE.
R05611
772511
DISK COMPRESSOR, 11TH STAGE.
R18714
772511
DISK COMPRESSOR, 11TH STAGE.
R29877
772511
DISK COMPRESSOR, 11TH STAGE.
R29944
772511
DISK COMPRESSOR, 11TH STAGE.
R29960
772511
DISK COMPRESSOR, 11TH STAGE.
R30004
772511
DISK COMPRESSOR, 11TH STAGE.
R30196
772511
DISK COMPRESSOR, 11TH STAGE.
R30400
772511
DISK COMPRESSOR, 11TH STAGE.
R30622
772511
DISK COMPRESSOR, 11TH STAGE.
R30734
772511
DISK COMPRESSOR, 11TH STAGE.
R30906
772511
DISK COMPRESSOR, 11TH STAGE.
R44093
772511
DISK COMPRESSOR, 11TH STAGE.
R44808
772511
DISK COMPRESSOR, 11TH STAGE.

SN
P/N
Description
R45420
772511
DISK COMPRESSOR, 11TH STAGE.
R45926
772511
DISK COMPRESSOR, 11TH STAGE.
R46487
772511
DISK COMPRESSOR, 11TH STAGE.
S04447
772511
DISK COMPRESSOR, 11TH STAGE.
S04609
772511
DISK COMPRESSOR, 11TH STAGE.
S80579
772511
DISK COMPRESSOR, 11TH STAGE.
S80718
772511
DISK COMPRESSOR, 11TH STAGE.
S80811
772511
DISK COMPRESSOR, 11TH STAGE.
T22392
772511
DISK COMPRESSOR, 11TH STAGE.
T23022
772511
DISK COMPRESSOR, 11TH STAGE.
T23028
772511
DISK COMPRESSOR, 11TH STAGE.
T23042
772511
DISK COMPRESSOR, 11TH STAGE.
BENCAM8030
815611
DISK COMPRESSOR, 11TH STAGE.
BENCAP1478
815611
DISK COMPRESSOR, 11TH STAGE.
BENCAP1525
815611
DISK COMPRESSOR, 11TH STAGE.
BENCAP3999
815611
DISK COMPRESSOR, 11TH STAGE.
3A7566
701412
DISK COMPRESSOR,12TH STAGE.
BENCAH0234
772512
DISK COMPRESSOR, 12TH STAGE.
H58273
772512
DISK COMPRESSOR, 12TH STAGE.
H76934
772512
DISK COMPRESSOR, 12TH STAGE.
K04068
772512
DISK COMPRESSOR, 12TH STAGE.
L85496
772512
DISK COMPRESSOR, 12TH STAGE.
M09749
772512
DISK COMPRESSOR, 12TH STAGE.
M10951
772512
DISK COMPRESSOR, 12TH STAGE.
M49036
772512
DISK COMPRESSOR, 12TH STAGE.
M61295
772512
DISK COMPRESSOR, 12TH STAGE.
M84028
772512
DISK COMPRESSOR, 12TH STAGE.
M84233
772512
DISK COMPRESSOR, 12TH STAGE.
N57563
772512
DISK COMPRESSOR, 12TH STAGE.
N58053
772512
DISK COMPRESSOR, 12TH STAGE.
P11181
772512
DISK COMPRESSOR, 12TH STAGE.
P11212
772512
DISK COMPRESSOR, 12TH STAGE.
P51407
772512
DISK COMPRESSOR, 12TH STAGE.
P51774
772512
DISK COMPRESSOR, 12TH STAGE.
P52401
772512
DISK COMPRESSOR, 12TH STAGE.
P77282 .
772512
DISK COMPRESSOR, 12TH STAGE.
P97978
772512
DISK COMPRESSOR, 12TH STAGE.
R17545
772512
DISK COMPRESSOR, 12TH STAGE.
R18483
772512
DISK COMPRESSOR, 12TH STAGE.
R18596
772512
DISK COMPRESSOR, 12TH STAGE.
R45619
772512
DISK COMPRESSOR, 12TH STAGE.
R45941
772512
DISK COMPRESSOR, 12TH STAGE.
R72907
772512
DISK COMPRESSOR, 12TH STAGE.
R73448
772512
DISK COMPRESSOR, 12TH STAGE.
R73794
772512
DISK COMPRESSOR, 12TH STAGE.
R74102
772512
DISK COMPRESSOR, 12TH STAGE.
R74226
772512
DISK COMPRESSOR, 12TH STAGE.
S01740
772512
DISK COMPRESSOR, 12TH STAGE.
S01866
772512
DISK COMPRESSOR, 12TH STAGE.
S01877
772512
DISK COMPRESSOR, 12TH STAGE.
S01918
772512
DISK COMPRESSOR, 12TH STAGE.
S02036
772512
DISK COMPRESSOR, 12TH STAGE.
S19787
772512
DISK COMPRESSOR, 12TH STAGE.
S51385
772512
DISK COMPRESSOR, 12TH STAGE.
S51589
772512
DISK COMPRESSOR, 12TH STAGE.
SO1816
772512
DISK COMPRESSOR, 12TH STAGE.
B212AA0497
798512
DISK COMPRESSOR, 12TH STAGE.
B212AA0517
798512
DISK COMPRESSOR, 12TH STAGE.
B212AA0943
798512
DISK COMPRESSOR, 12TH STAGE.
B212AA1106
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAJ6163
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAJ9174
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAK2345
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAK2388
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAK5240
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAK9190
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAL2466
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAL5411
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAL6708
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAM3530
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAM3774
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAM5489
798512
DISK COMPRESSOR, 12TH STAGE.

SN
P/N
Description
BENCAM6218
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAN0910
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAN6906
798512
DISK COMPRESSOR, 12TH STAGE.
S94496
798512
DISK COMPRESSOR, 12TH STAGE.
S94583
798512
DISK COMPRESSOR, 12TH STAGE.
S94619
798512
DISK COMPRESSOR, 12TH STAGE.
S94637
798512
DISK COMPRESSOR, 12TH STAGE.
T28485
798512
DISK COMPRESSOR, 12TH STAGE.
T43078
798512
DISK COMPRESSOR, 12TH STAGE.
T43084
798512
DISK COMPRESSOR, 12TH STAGE.
BENCAP3428
815612
DISK COMPRESSOR, 12TH STAGE.
BENCAP7698
815612
DISK COMPRESSOR, 12TH STAGE.
BENCAP7719
815612
DISK COMPRESSOR, 12TH STAGE.
BENCAP7720
815612
DISK COMPRESSOR, 12TH STAGE.
BENCAP8481
815612
DISK COMPRESSOR, 12TH STAGE.
BENCAR2033
815612
DISK COMPRESSOR, 12TH STAGE.

The P/N and description for each SN are provided as reference information.

Table 2.--Affected Rear Compressor Front Hubs

SN
P/N
Description
2U4347
521041
HUB REAR COMPRESSOR, FRONT.
2U4814
521041
HUB REAR COMPRESSOR, FRONT.
2U5426
521041
HUB REAR COMPRESSOR, FRONT.
4R1473
521041
HUB REAR COMPRESSOR, FRONT.
6P7156
521041
HUB REAR COMPRESSOR, FRONT.
9L9671
521041
HUB REAR COMPRESSOR, FRONT.
9L9679
521041
HUB REAR COMPRESSOR, FRONT.
9P3378
521041
HUB REAR COMPRESSOR, FRONT.
9S4536
521041
HUB REAR COMPRESSOR, FRONT.
9V7938
521041
HUB REAR COMPRESSOR, FRONT.
2U4900
650782
HUB REAR COMPRESSOR, FRONT.
B 21738
650782
HUB REAR COMPRESSOR, FRONT.
2U5010
698145
HUB REAR COMPRESSOR, FRONT.
9V8201
698145
HUB REAR COMPRESSOR, FRONT.
3X3000
717623
HUB REAR COMPRESSOR, FRONT.
3X6979
717623
HUB REAR COMPRESSOR, FRONT.
5Z4371
717623
HUB REAR COMPRESSOR, FRONT.
8X6204
717623
HUB REAR COMPRESSOR, FRONT.
9V8645
717623
HUB REAR COMPRESSOR, FRONT.
G23815
717623
HUB REAR COMPRESSOR, FRONT.
G23817
717623
HUB REAR COMPRESSOR, FRONT.
H05055
717623
HUB REAR COMPRESSOR, FRONT.
H05059
717623
HUB REAR COMPRESSOR, FRONT.
K47148
717623
HUB REAR COMPRESSOR, FRONT.
N08016
717623
HUB REAR COMPRESSOR, FRONT.
N08021
717623
HUB REAR COMPRESSOR, FRONT.
P16923
717623
HUB REAR COMPRESSOR, FRONT.
R15834
717623
HUB REAR COMPRESSOR, FRONT.
S61487
717623
HUB REAR COMPRESSOR, FRONT.
N08020
717623
HUB REAR COMPRESSOR, FRONT.
2U4331
726222
HUB REAR COMPRESSOR, FRONT.
4P2249
726222
HUB REAR COMPRESSOR, FRONT.
4R2166
726222
HUB REAR COMPRESSOR, FRONT.
9M2324
726222
HUB REAR COMPRESSOR, FRONT.
P3757
726222
HUB REAR COMPRESSOR, FRONT.
9S4223
726222
HUB REAR COMPRESSOR, FRONT.
9V8146
726222
HUB REAR COMPRESSOR, FRONT.
2X6377
726227
HUB REAR COMPRESSOR, FRONT.
2X6391
726227
HUB REAR COMPRESSOR, FRONT.
3X2998
726227
HUB REAR COMPRESSOR, FRONT.
4R1190
726227
HUB REAR COMPRESSOR, FRONT.
6X0015
726227
HUB REAR COMPRESSOR, FRONT.
6X0071
726227
HUB REAR COMPRESSOR, FRONT.
9P4067
726227
HUB REAR COMPRESSOR, FRONT.
9V8100
726227
HUB REAR COMPRESSOR, FRONT.
9V8331
726227
HUB REAR COMPRESSOR, FRONT.
4R1272
726230
HUB REAR COMPRESSOR, FRONT.
9V8024
726230
HUB REAR COMPRESSOR, FRONT.
9V8107
726230
HUB REAR COMPRESSOR, FRONT.

The P/N and description for each SN are provided as reference information.

Prohibition Against Installation of Disks and Hubs Listed in Table 1

(g) After the effective date of this AD, do not install any disk or hub listed in Table 1 of this AD that has zero cycles-in-service since May 14, 2001.

(h) After the effective date of this AD, do not return to service any engine that has a disk or hub listed in Table 1 of this AD that has zero cycles-in-service since May 14, 2001.

Definition of Shop Visit

(i) A shop visit is defined as an engine and/or module removal where engine maintenance entails separation of pairs of major engine flanges or the removal of a disk, hub or spool at a maintenance facility, regardless of the scheduled maintenance action or the reason for engine removal.

Definition of Part Accessibility

(j)For the purposes of this AD, accessibility of the HPC rear hub is removing the hub from the engine.

Alternative Methods of Compliance

(k) The Manager, Engine Certification Office, has the authority to approve alternative methods of compliance for this AD if requested using the procedures found in 14 CFR 39.19.

Related Information

(l) None.

Material Incorporated by Reference

(m) You must use Pratt & Whitney Alert Service Bulletin (ASB) No. JT8D A6442, dated April 4, 2003, to perform the actions required by this AD. The Director of the Federal Register approved the incorporation by reference of this service bulletin in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Pratt & Whitney, 400 Main St., East Hartford, CT 06108; telephone (860) 565-7700; fax (860) 565-1605, for a copy of this service information. You may review copies at the Docket Management Facility; U.S. Department of Transportation, 400 Seventh Street, SW., Nassif Building, Room PL- 401,Washington, DC 20590-0001, on the Internet at http://dms.dot.gov , or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html .

The FAA proposed to amend 14 CFR part 39 with a proposed airworthiness directive (AD). The proposed AD applies to Pratt & Whitney (PW) JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, - 15, -15A, -17, -17A, -17R, -17AR, -209, -217, -217A, -217C, and -219 turbofan engines. We published the proposed AD in the Federal Register on December 30, 2004 (69 FR 78359). That action proposed to require removing affected rotating parts overhauled by a certain repair vendor, and inspecting or replacing the parts as applicable.

Examining the AD Docket

You may examine the docket that contains the AD, any comments received, and any final disposition in person at the DMS Docket Offices between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Office (telephone (800) 647-5227) is located on the plaza level of the Department of Transportation Nassif Building at the street address stated in ADDRESSES. Comments will be available in the AD docket shortly after the DMS receives them.

Comments

We provided the public the opportunity to participate in the development of this AD. We have considered the comments received.

Request To Remove Rear Compressor Rear Hub From List of Affected Parts

One commenter requests that we remove the rear compressor rear hub from the list of affected parts. The commenter states that the part is a nickel alloy similar to the 13th stage disk and there is no cracking or corrosion associated with it. In addition, the rear compressor rear hub is not a life-limited part, and the serial numbers are not readily available. As a result, the commenter feels the proposed AD would force operators to inspect all parts, not just the listed serial number parts.

We agree. We have removed it from this AD.

Include All Parts Improperly Processed by the Repair Vendor

One commenter asks that this AD include all parts improperly processed by a certain repair vendor, not just the high-pressurecompressor.

We do not agree. The proposed AD addresses those parts that pose a safety threat. All other parts either present no known safety threat, or are already addressed through other applicable ADs and field notifications. If we decide that further AD action is necessary to address other parts, we may issue a separate AD at that time.

Request To Clarify "Shop Visit"

One commenter asks that we clarify the definition of "shop visit" contained in the AD. The commenter feels that an operator could interpret a shop visit as when an airplane upon which an affected engine is installed, goes into a hangar.

We agree. We included the following definition in the AD: "A shop visit is defined as an engine removal where engine maintenance entails separation of pairs of major engine flanges or the removal of a disk, hub or spool at a maintenance facility, regardless of the scheduled maintenance action or the reason for engine removal."

Request To Inspect Rear Compressor Front and Rear Compressor Rear Hubs When They Are Accessible

One commenter asks that we not place time restrictions on operators to inspect rear compressor front and rear compressor rear hubs and instead inspect them when they are accessible. Because they aren't life-limited parts, the hubs are not tracked by serial numbers. The commenter believes the proposed AD would require operators to inspect every JT8D before March 31, 2008. Those inspections would force early removal of many engines. We partially agree. Table 1 of this AD lists all life-limited rear compressor front hubs, and operators must inspect them by the March 31, 2008, deadline. Table 2 of this AD lists all rear compressor front hubs that are non-life limited. Operators must inspect them at the next accessibility. We removed the rear compressor rear hubs from this AD, based on a previous comment.

Compliance Date

One commenter asks us to explain how we determined the March 31, 2008 compliance date. The commenter states that it is unclear how we selected that compliance date since corrosion inspection ADs 2003-16-05 and 2003-12-07, as well as PW ASBs A6431 and A6435, designate July 18, 2011, as a compliance date.

We evaluated the results of a risk analysis based on inspection data obtained from a sample of parts repaired by the repair vendor. That analysis demonstrated a greater risk of failure if the parts were only inspected for corrosion and not for cracking as mandated in ADs 2003-16-05 and 2003-12-07. Based on that risk analysis, we set March 31, 2008, as the date by which operators must complete the inspections.

Use of Certain Parts as Serviceable Parts

One commenter recommends inspecting all parts listed in Tables 1 and 2 that have zero cycles-in-service since May 14, 2001, using PW ASB A6442 and made available for use as spare parts.

We do not agree. Parts listed in Table 1 were subjected to shot peening that could mask surface cracks. Parts listed in Table 2 were not. If the parts in Table 1 were cracked and, thereafter, shot peened, the cracks will reopen once operated in an engine, a significant factor in our risk analysis and the resulting compliance schedule in the proposed AD. Since there is no effective inspection to detect these cracks, operators may use only parts that have been in service. This is consistent with the manufacturer's disposition instructions in ASB A6442 that state, "All compressor disks and hubs listed in Table 1 that are not installed in an engine MUST be scrapped."

Definition of Installed Part

One commenter requests that the definition of installed part be included in this AD to prevent "operation of a part physically installed in a module."

We do not agree. A definition of "installed part" is unnecessary because this proposed AD prohibits all parts with zero cycles-in- service that are listed in Table 1 from entering service, regardless of whether they are installed or not. However, we added a new paragraph (h) to prevent installing any engine that has an affected disk or hub that has zero cycles-in-service after May 14, 2001, and recodified the subsequent paragraphs.

Operators' Cost

One commenter asks that we explain the cost to operators, suggesting that we evaluate the cost as if every part fails inspection. The commenter states that the current market value for all affected parts is $14,413,020, and the cost to disassemble, inspect and reassemble engines outside of regularly scheduled maintenance is $1,766,440.

We disagree. We still consider our evaluation of cost as noted in the NPRM valid. We do not expect that every part will fail the inspection, although we estimate that the number will be substantial. In addition, we did not include the full cost of every disk in the economic analysis if the disks must be replaced before they reach their certified life, a normal operating expense. Accordingly, we didn't change the Costs to Comply.

Add Spare Parts to Paragraph (g)

One commenter asks that we add a sentence to Paragraph (g) that reads "This includes all parts on the shelf that have not been used."

We do not agree. This AD is clear as written. We have not added the sentence.

Conclusion

We have carefully reviewed the available data, including the comments received, and determined that air safety and the public interest require adopting the AD with the changes described previously. We have determined that these changes will neither increase the economic burden on any operator nor increase the scope of the AD.

Interim Action

These actions are interim actions and we might take further rulemaking action in the future.

Costs of Compliance

We estimate that this AD will affect about 632 JT8D engines installed on airplanes of U.S. registry. We estimate that 158 engines will require access to the high-pressure compressor outside of regularly scheduled maintenance, and will require 66 work hours per engine. The highpressure compressor section of the remaining 474 engines will be inspected during regularly scheduled maintenance, and will not require additional labor costs to inspect. The average labor rate is $65 per work hour. We estimate that half of the parts presently installed will require replacement, at a cost of approximately $6,730,800. Based on this information, we estimate the total cost of the AD to U.S. operators to be $7,398,620.

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, Section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency's authority.

We are issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701, "General requirements." Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.

Regulatory Findings

We have determined that this AD will not have federalism implications under Executive Order 13132. This AD will 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.

For the reasons discussed above, I certify that this AD:

(1) Is not a "significant regulatory action" under Executive Order 12866;

(2) Is not a "significant rule" under 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.

We prepared a summary of the costs to comply with this AD and placed it in the AD Docket. You may get a copy of this summary at the address listed under ADDRESSES.

List of Subjects in 14 CFR Part 39

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

Adoption of the Amendment

Accordingly, under the authority delegated to me by the Administrator, the Federal Aviation Administration amends 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. The FAA amends Sec. 39.13 by adding the following new airworthiness directive:

You can get the service information identified in this AD from Pratt & Whitney, 400 Main St., East Hartford, CT 06108; telephone (860) 565-7700; fax (860) 565-1605.

You may examine the AD docket on the Internet at http://dms.dot.gov or in Room PL-401 on the plaza level of the Nassif Building, 400 Seventh Street, SW., Washington, DC.

Keith Lardie, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803-5299; telephone (781) 238-7189; fax (781) 238-7199.