75-22-05 DETROIT DIESEL ALLISON: Amendment 39-2391. Applies to Detroit Diesel Allison Model 501-D13 series engines which incorporate P/N 6829072 and 6847112 second stage turbine wheels with the serial numbers listed below:
Compliance required as indicated:
I. Remove from service in accordance with the schedule in paragraphs I.A, B, C, and D, wheels with the following serial numbers:
CA-6108
CA-6112
CA-6114
CA-6056
CA-6083
KK-2052
to and including
KK-2053
KK-2055
to and including
KK-2085
KK-2092
to and including
KK-2094
KK-2099
to and including
KK-2100
KK-2102
to and including
KK-2115
KK-2117
to and including
KK-2167
KK-2169
to and including
KK-2251
KK-2253
to and including
KK-2329
KK-2332
to and including
KK-2382
KK-2384
to and including
KK-2460
KK-2475
to and including
KK-2500
KK-2502
to and including
KK-2643
KK-2645
to and including
KK-2682
KK-2763
to and including
KK-2813
KK-2824
to and including
KK-2857
KK-2873
to and including
KK-2901
KK-3033
to and including
KK-3034
KK-3047
to and including
KK-3048
KK-3063
to and including
KK-3075
KK-3108
to and including
KK-3118
KK-3136
to and including
KK-3239
KK-3287
to and including
KK-3300
KK-3314
to and including
KK-3327
KK-3617
to and including
KK-3643
KK-3756
to and including
KK-3768
KK-3867
to and including
KK-3880
KK-11829
to and including
KK-11832
KK-16501
to and including
KK-16589
KK-16901
to and including
KK-16999
KK-19966
to and including
KK-20064
NOTE: At time of overhaul, some wheels have R1, R2, R3, R4, or R5 added as a suffix to the wheel serial number. The suffix should be disregarded in determining the applicability of this A.D.
A. Remove from service within the next 200 cycles, wheels which have 16,000 or more total cycles on the effective date of this A.D.
B. Remove from service within the next 400 cycles, or prior to exceeding 16,200 total cycles, which ever comes first, wheels which have from 14,000 to 16,000 total cycles on the effective date of this A.D.
C. Remove from service within the next 500 cycles, or prior to exceeding 14,400 total cycles whichever comes first, wheels which have 13,500 to 14,000 total cycles on the effective date of this A.D.
D. Remove from service prior to exceeding 14,000 total cycles, wheels which have less than 13,500 total cycles on the effective date of this A.D.
II. Remove from service in accordance with the schedule in paragraphs II A, B, C, D, E and F, wheels with the following serial numbers:
KK-3132 and
KK-15499
KK-29611
to and including
KK-2997
KK-3035
to and including
KK-3046
KK-3049
to and including
KK-3062
KK-3076
to and including
KK-3107
KK-3119
to and including
KK-3130
KK-3240
to and including
KK-3286
KK-3301
to and including
KK-3313
KK-3328
to and including
KK-3364
KK-3376
to and includingKK-3580
KK-3582
to and including
KK-3616
KK-3644
to and including
KK-3755
KK-3769
to and including
KK-3782
KK-3798
to and including
KK-3866
KK-3881
to and including
KK-3949
KK-3963
to and including
KK-3976
KK-3996
to and including
KK-4006
KK-1180
to and including
KK-11821
KK-14201
to and including
KK-14207
KK-14466
to and including
KK-14470
KK-14801
to and including
KK-14815
KK-15704
to and including
KK-15784
KK-20577
to and including
KK-20680
KK-21599
to and including
KK-21653
A. Remove from service within the next 200 cycles, wheels which have 16,000 or more total cycles on the effective date of this A.D.
B. Remove from service within the next 400 cycles, or prior to exceeding 16,200 total cycles, whichever comes first, wheels which have from 14,000 to 16,000 total cycles on the effective date of this A.D.
C. Remove from service within the next 1000 cycles, or prior to exceeding 14,400 total cycles whichever comes first, wheels which have 10,500 to 14,000 total cycles on the effective date of this A.D.
D. Remove from service within the next 2,000 cycles, or prior to exceeding 11,500 total cycles, whichever comes first, wheels which have from 7,000 to 10,500 total cycles on the effective date of this A.D.
E. Remove from service within the next 2,100 cycles, or prior to exceeding 9,000 total cycles, whichever comes first, wheels which have from 4,900 to 7,000 total cycles on the effective date of this A.D.
F. Remove from service prior to exceeding 7,000 total cycles, wheels with less than 4,900 total cycles on the effective date of this A.D.
III. Remove from service in accordance with the schedule in paragraphs III A, and B, wheels with serial numbers not specified in Paragraphs I or II above, or in AD 75-17-32 (Amdt. 39-2336).
A. Remove from service within the next 100 cycles, wheels which have 6900 or more total cycles on the effective date of this A.D.
B. Removefrom service prior to exceeding 7,000 total cycles, wheels which have less than 6,900 total cycles on the effective date of this A.D.
IV. Wheels removed per paragraphs I, II or III above, which have less than 14,000 total cycles may be inspected as specified in IV.A and B, and if found satisfactory, may be returned to service until they reach the total number of cycles specified in IV.C; however, no wheels may exceed 11,000 total hours in service.
A. Inspect for hub spline cracks using fluorescent penetrant method FP-30A or ZL-30A.
B. Inspect and classify microstructure per Detroit Diesel Allison 501-D13 Commercial Overhaul Information Letter No. COIL-349.
C. Wheels inspected and classified per IV.A and B above, may be continued in service as follows:
1. Light carbide and medium light carbide wheels may be operated for a maximum of 14,000 cycles total.
2. Medium heavy carbide wheels may be operated for 7,000 cycles between inspections per IV.A andB above, for a maximum of 14,000 total cycles.
3. Heavy carbide wheels may not be operated more than 7,000 total cycles maximum.
V. For the purposes of this airworthiness directive, a cycle is defined as one takeoff.
VI. Detroit Diesel Allison 501-D13 Commercial Service Letter No. CSL-235 pertains to this subject.
The manufacturer's service letter identified and described in this directive is incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received this document from the manufacturer may obtain copies upon request to Detroit Diesel Allison, Division of General Motors Corporation, P. O. Box 894, Indianapolis, Indiana, 46206.
This document may also be examined at the Office of the Regional Counsel, Federal Aviation Administration, Great Lakes Region, 2300 East Devon Avenue, Des Plaines, Illinois, 60018, and at Federal Aviation Administration Headquarters, 800 Independence Avenue, S.W., Washington, D.C., 20591. A historical file on this AD which includes the incorporated material in full is maintained by the Federal Aviation Administration at its headquarters in Washington, D.C., and at the Great Lakes Regional Office in Des Plaines, Illinois.
This supersedes Amendment 39-2117, Airworthiness Directive 75-05-15.
This amendment is effective October 23, 1975.