AD 89-20-01 R1 ACTIVE

89-20-01 R1 GENERAL ELECTRIC COMPANY: Amendment 39-6337 as revised by Amendment 39-6411.

Applicability: General Electric Company (GE) CF6-6 series turbofan engines installed in McDonnell Douglas DC10-10 aircraft.

Compliance: Required as indicated, unless already accomplished.

To detect the existence of metallurgical imperfections in Stage 1 fan disks which could adversely affect Stage 1 fan disk service life, ultrasonic inspect all Stage 1 fan disks in accordance with the Appendix to this AD, and the following schedule:

(a) All Stage 1 fan disks with those serial numbers listed in TABLE 1 of this AD, immersion ultrasonic inspect no later than October 27, 1989.

(b) All Stage 1 fan disks identified by those serial numbers listed in TABLE 2 of this AD, as follows:

(1) Remove fan rotor spinner cone and contact ultrasonic inspect the installed fan disk no later than November 21, 1989.

(2) Immersion ultrasonic inspect within the next 500 cycles in service after accomplishing the contact ultrasonic inspection requirements of paragraph (b)(1) above, or at the next shop visit after October 7, 1989, or no later than April 1, 1990, whichever comes first.

(c) All Stage 1 fan disks identified by serial numbers listed in TABLE 3 of this AD, as follows:

(1) Remove fan rotor spinner cone and contact ultrasonic inspect the installed fan disk no later than February 4, 1990, and reinspect at intervals not to exceed 500 cycles since the last contact ultrasonic inspection until the immersion ultrasonic requirement of paragraph (c)(2) has been accomplished.

(2) Immersion ultrasonic inspect at the next shop visit after October 7, 1989, but no later than December 31, 1990.

(d) All Stage 1 fan disks identified by those serial numbers listed in TABLE 2A of this AD, as follows:

(1) Remove fan rotor spinner cone and contact ultrasonic inspect the installed fan disk no later than January 23, 1990.

(2) Immersion ultrasonic inspect within the next 500 cycles in service after accomplishing the contact ultrasonic inspection requirements of paragraph (d)(1) above, or at the next shop visit after December 12, 1989, or no later than June 5, 1990, whichever comes first.

(e) All Stage 1 fan disks identified by serial numbers listed in TABLE 3A of this AD, as follows:

(1) Remove fan rotor spinner cone and contact ultrasonic inspect the installed fan disk no later than April 10, 1990, and reinspect at intervals not to exceed 500 cycles since the last contact ultrasonic inspection until the immersion ultrasonic requirement of paragraph (e)(2) has been accomplished.

(2) Immersion ultrasonic inspect at the next shop visit after December 12, 1989, but no later than March 5, 1991.

NOTES: (1) Disks which have been previously immersion ultrasonic inspected in accordance with GE Commercial Engine Memorandum No. 98, Rev. 2, dated October 5, 1989, are considered to be in compliance with the immersion ultrasonic inspection requirements of paragraphs (a), (b), (c), (d), and (e) above.

(2) For the purpose of this AD, "shop visit" is defined as the induction of the engine into the shop for any reason.

(3) Accomplishment of the immersion ultrasonic inspection requirements of paragraphs (b)(2), (c)(2), (d)(2), and (e)(2) above relieves the requirements for contact ultrasonic inspections of paragraphs (b)(1), (c)(1), (d)(1), and (e)(1) above.

(f) Remove from service, prior to further flight, fan disks inspected in accordance with paragraphs (a), (b), (c), (d), and (e) which do not meet the acceptance criteria of the Appendix to this AD and replace with a serviceable part. Report all inspection findings in writing within 10 days of the inspection to the Manager, Engine Certification Office, ANE-140, Engine and Propeller Directorate, Aircraft Certification Service, 12 New England Executive Park, Burlington, Massachusetts, 01803; Telex No. 949301 FAANE BURL.

Information collection requirements contained in this regulation (Section 39.13) have been approved by the Office of Management and Budget under the provisions of the Paperwork Reduction Act of 1980 (Pub. L. 96- 511) and have been assigned OMB Control Number 2120-0056.

(g) Aircraft may be ferried in accordance with the provisions of FAR 21.197 and 21.199 to a base where the AD can be accomplished.

(h) Upon submission of substantiating data by an owner or operator through an FAA Airworthiness Inspector, an alternate method of compliance with the requirements of this AD or adjustments to the compliance schedules specified in this AD may be approved by the Manager, Engine Certification Office, Engine and Propeller Directorate, Aircraft Certification Service, Federal Aviation Administration, 12 New England Executive Park, Burlington, Massachusetts 01803.

TABLE 1

MP000382
MP000383
MP000384
MP000386
MP000387
MP000388

TABLE 2

MP000352
MP000363
MP000374
MP000390
MP000407
MP0A0117
MP000354
MP000364
MP000375
MP000393
MP000411
MP0A0133
MP000357
MP000365
MP000376
MP000395
MP0A0108
MP0A0136
MP000358
MP000368
MP000377
MP000397
MP0A0109
MP0A0140
MP000359
MP000370
MP000378
MP000398
MP0A0110
MP0A0141
MP000360
MP000371
MP000379
MP000399
MP0A0111
MP0A0142
MP000361
MP000372
MP000380
MP000402
MP0A0112
MP0A0143
MP000362
MP000373
MP000389
MP000404
MP0A0113
MP0A0145

MP0A0115

TABLE 2A

MP0A0135
MP0A0182

TABLE 3

MP000150
MP000188
MP000222
MP000251
MP000284
MP000319
MP000151
MP000189
MP000223
MP000253
MP000285
MP000320
MP000152
MP000190
MP000224
MP000254
MP000286
MP000321
MP000153
MP000191
MP000225
MP000255
MP000289
MP000322
MP000154
MP000193
MP000226
MP000257
MP000290
MP000323
MP000155
MP000194
MP000228
MP000258
MP000291
MP000325
MP000156
MP000195
MP000229
MP000260
MP000292
MP000326
MP000158
MP000196
MP000230
MP000263
MP000293
MP000331
MP000159
MP000197
MP000231
MP000264
MP000295
MP000334
MP000160
MP000198
MP000232
MP000265
MP000297
MP000336
MP000161
MP000199
MP000233
MP000266
MP000298
MP000337
MP000162
MP000200
MP000234
MP000267
MP000299
MP000338
MP000163
MP000204
MP000235
MP000268
MP000300
MP000339
MP000168
MP000205
MP000236
MP000270
MP000302
MP000340
MP000171
MP000206
MP000237
MP000271
MP000303
MP000341
MP000172
MP000207
MP000238
MP000272
MP000304
MP000342
MP000173
MP000208
MP000240
MP000273
MP000305
MP000343
MP000175
MP000209
MP000241
MP000274
MP000308
MP000346
MP000177
MP000212
MP000243
MP000276
MP000311
MP000348
MP000178
MP000213
MP000244
MP000277
MP000312
MP000349
MP000179
MP000214
MP000245
MP000278
MP000313
MP000350
MP000180
MP000215
MP000246
MP000279
MP000314
MP0A0137
MP000181
MP000216
MP000247
MP000280
MP000315
MP0A0139
MP000182
MP000217
MP000248
MP000281
MP000316
MP0A0207
MP000184
MP000218
MP000249
MP000282
MP000317
MP0A0439
MP000185
MP000219
MP000250
MP000283
MP000318

MP000186
MP000220

MP000187
MP000221

TABLE 3A

MP000618
MP000139
MP000103
MP000011
MP0C2744
MP0A0376
MP000436
MPOOO136
MP000102
MP000010
MP0C0321
MP0A0291
MP000353
MP000113
MP000078
MP000009
MP0A0880
MP0A0284
MP000351
MP000111
MP000016
MP000005
MP0A0810
MP0A0206
MP000294
MP000109
MP000015
MP000004
MP0A0801
MP0A0200
MP000174
MP000108
MP000014
MP000003
MP0A0736
MP0A0139
MP000149
MP000107
MP000013
MP000002
MP0A0662
MP0A0138
MP000141
MP000104
MP000012
MP0H3844
MP0A0481
MP0G2753

The ultrasonic inspections shall be done in accordance with the Appendix to this AD.

This AD revises Amendment 39-6337 (54 FR 38814; September 21, 1989), AD 89-20-01, which became effective on October 7, 1989.

This amendment (39-6411, AD 89-20-01 R1) becomes effective on December 12, 1989.

89-20-01 R1 Appendix

The applicable General Electric Service Bulletin (CF6-6) 72-947, Revision 2, dated November 21, 1989, and the following General Electric Manufacturing and Field Quality Procedures may be obtained from General Electric Company, Technical Publications Department, 1 Neuman Way, Cincinnati, Ohio 45215, or may be examined in the Regional Rules Docket (Docket #89-ANE-35), FAA, New England Region, Office of Assistant Chief Counsel, 12 New England Executive Park, Burlington, Massachusetts 01803.

(A) General Electric Manufacturing and Field Quality Technology Procedure No. 391, issued September 15, 1989, Rev. 1, dated September 28, 1989.

(B) General Electric Manufacturing and Field Quality Technology Procedure No. 384, issued September 15, 1989, Rev. 2, dated October 5, 1989.

(C) General Electric Manufacturing and Field Quality Technology Procedure No. 385, issued September 14, 1989, Rev. 2, dated October 5, 1989.

(D) General Electric Manufacturing and Field Quality Technology Procedure No. 389, issued September 14, 1989, Rev. 2, dated October 3, 1989.