88-17-01 ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORPORATION (ALLISON): Amendment 39-6092. Final copy of Priority Letter AD 88-17-01 issued August 15, 1988.
Applicability: Allison Model 250-B17, -C20, -C20R, and -C30 series engines, incorporating Bendix gas producer fuel controls listed in the attached appendix, installed in aircraft certificated in any category.
Compliance: Required as indicated, unless already accomplished.
To prevent possible engine over-temperature, loss of throttle response, or unscheduled power increase accomplish the following:
(a) Remove from service within the next ten (10) operating hours after the effective date of this AD, the affected Bendix gas producer fuel controls listed by part number and serial number in the attached appendix and replace with a serviceable part.
NOTES: (1) Out-of-service affected Bendix gas producer fuel controls, listed by part number and serial number in the attached appendix, may be returned to serviceupon the incorporation of Allison Alert Commercial Engine Bulletin (CEB) titled "Engine, Fuel and Control, Inspection of Certain Bendix Fuel Control Bellows Assemblies", dated August 1, 1988, with applicability as follows:
ENGINE MODEL
BULLETIN NUMBER
250-C20 Series
CEB-A-1272
250-B17 Series
TP CEB-A-1231
250-C30 Series
CEB-A-73-3042
250-C20R Series
CEB-A-73-4008
(2) Those affected Bendix gas producer fuel controls incorporating the above-cited Allison Alert CEB are identified by a green mark on the cylinder portion of the self-locking cap nut and either the letter "A" or the letter "B" in the "LESS ISSUE" block of the data plate.
(b) Aircraft may be ferried in accordance with the provisions of FAR 21.197 and 21.199 to a base where this AD can be accomplished.
(c) Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Chicago Aircraft Certification Office, Federal Aviation Administration, 2300 East Devon Avenue, Des Plaines, Illinois 60018.
(d) Upon submission of substantiating data by an owner or operator through an FAA Airworthiness Inspector, the Manager, Chicago Aircraft Certification Office, may adjust the compliance time specified in this AD.
Allison Alert CEB titled "Engine, Fuel and Control, Inspection of Certain Bendix Fuel Control Bellows Assemblies", dated August 1, 1988, identified and described in this document, 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 Allison Gas Turbine Division, General Motors Corporation, P.O. Box 420, Indianapolis, Indiana 46206-0420. This document may also be examined at the Office of the Assistant Chief Council, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, Room 311, Rules Docket Number 88-ANE-32, between the hours of 8:00 a.m. and 4:30 p.m., Monday through Friday, except federal holidays.
This amendment (39-6092, AD 88-17-01) becomes effective March 1, 1989, as to all persons except those persons to whom it was made immediately effective by individual Priority Letter AD 88-17-01 issued August 15, 1988, which contained this amendment.
APPENDIX AD 88-17-01
Bendix Fuel Controls:
Bendix Part No.:
2524644-26 (Allison 23033917)
Serial No.:
87241174
87490092
88041524
88090122
87370001
88041515
88090107
88090124
*
87430041
88041516
88090110
88090125
87430042
88041517
88090112
88090126
*
87430044
88041518
88090114
88090128
87430045
88041519
88090116
88090129
87490081
88041520
88090118
88090130
87490082
88041521
88090119
88090131
87490083
88041522
88090120
87490084
88041523
88090121
Bendix Part No.:
2524654-23 (Allison 23036660)
Serial No.:
87251235
87460078
Bendix Part No.:
2524886-10 (Allison 23033919)
Serial No.:
87430052
87430055
87490102
87430053
87490101
87490104
Bendix Part No:
2524922-6 (Allison 23033849)
Serial No.:
87370010
88090143
88090144
Bendix Part No.:
2524957-3 (Allison 23030614)
Serial No.:
84250105
Bendix Part No.:
2524986-2 (Allison 23038954)
Serial No.:
87490095
87490098
Bendix Part No.:
2549032-2 (Allison 23037275)
Serial No.:
87430056
87430063
88090154
88090163
87430057
87430065
88090155
88090165
87430059
88090147
88090156
88090166
87430060
88090149
88090157
88130236
87430061
88090151
88090158
88130249
87430062
88090152
88090160
88130250
*These Serial Nos. corrected from Priority Letter AD 88-17-01 by this Final Rule.