AD 86-17-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 501-D13 | ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. (Allison, formerly Detroit Diesel Allison) Models 501-D13, -D13A, -D13D, and -D13H Engines |
| engine | Rolls-Royce Corporation | 501-D13A | ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. (Allison, formerly Detroit Diesel Allison) Models 501-D13, -D13A, -D13D, and -D13H Engines |
| engine | Rolls-Royce Corporation | 501-D13D | ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. (Allison, formerly Detroit Diesel Allison) Models 501-D13, -D13A, -D13D, and -D13H Engines |
| engine | Rolls-Royce Corporation | 501-D13H | ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. (Allison, formerly Detroit Diesel Allison) Models 501-D13, -D13A, -D13D, and -D13H Engines |
Unsafe Condition
The possibility of unwanted autofeather or inability to autofeather when required due to thrust sensitive switch assemblies with part numbers 6792891, 6794122, 6794359, 6807776, 23005483, or 23005485.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace thrust sensitive switch assemblies with part number 6870559 in accordance with Allison Commercial Engine Alert Bulletin CEB-A-73-84, Revision 2, or FAA approved equivalent.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 60 days after the effective date of this AD
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Affected Aircraft
Allison 501-D13, -D13A, -D13D, and -D13H engine reduction gear assemblies equipped with thrust sensitive switch assemblies P/N 6792891, 6794122, 6794359, 6807776, 23005483, or 23005485.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Thrust Sensitive Switch Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_86-17-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 86-17-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. (Allison, formerly Detroit Diesel Allison) Models...Show more Subject: Thrust Sensitive Switch Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/15/1986 Make: Rolls-Royce Corporation Model: 501-D13 | 501-D13A | 501-D13D | 501-D13H Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 86-17-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5370 AD NUMBER: 86-17-06 SUBJECT HEADING: ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. (Allison, formerly Detroit Diesel Allison) Models 501-D13, -D13A, -D13D, and -D13H Engines ACTION: SUMMARY: DATES: Effective September 15, 1986. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 86-17-06 ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. (Allison, formerly Detroit Diesel Allison): Amendment 39-5370. Applies to Allison 501-D13, -D13A, -D13D, and -D13H engine reduction gear assemblies equipped with thrust sensitive switch assembly, P/N's 6792891, 6794122, 6794359, 6807776, 23005483, or 23005485. Compliance is required within 60 days after the effective date of this AD, unless already accomplished. To prevent the possibility of unwanted autofeather or the inability to autofeather when required, accomplish the following: Replace thrust sensitive switch assemblies, P/N's 6792891, 6794122, 6794359, 6807776, 23005483, and 23005485 with P/N 6870559, a single carbon contact switch assembly, in accordance with the detailed instructions provided in Allison Commercial Engine Alert Bulletin CEB-A-73-84, Revision 2, dated October 1, 1984, or FAA approved equivalent. 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. Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Chicago Aircraft Certification Office, FAA, 2300 East Devon Avenue, Des Plaines, Illinois 60018. Upon submission of substantiating data by an owner or operator through an FAA maintenance inspector, the Manager, Chicago Aircraft Certification Office, may adjust the compliance time specified in this AD. Allison Commercial Engine Alert Bulletin CEB-A-73-84, Revision 2, dated October 1, 1984, 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 Corp., P.O. Box 420, Indianapolis, Indiana 46206-0420. This document also may be examined at the Office of the Regional Counsel, FAA, ATTN: Rules Docket No. 82-ANE-50, 12 New England Executive Park, Burlington, Massachusetts 01803 and may be examined weekdays, except Federal holidays, between 8:00 a.m. and 4:30 p.m. This amendment becomes effective on September 15, 1986. FOOTER:
Document Text
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AD Final Rules - DRS_86-17-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 86-17-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. (Allison, formerly Detroit Diesel Allison) Models...Show more Subject: Thrust Sensitive Switch Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/15/1986 Make: Rolls-Royce Corporation Model: 501-D13 | 501-D13A | 501-D13D | 501-D13H Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 86-17-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5370 AD NUMBER: 86-17-06 SUBJECT HEADING: ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. (Allison, formerly Detroit Diesel Allison) Models 501-D13, -D13A, -D13D, and -D13H Engines ACTION: SUMMARY: DATES: Effective September 15, 1986. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 86-17-06 ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. (Allison, formerly Detroit Diesel Allison): Amendment 39-5370. Applies to Allison 501-D13, -D13A, -D13D, and -D13H engine reduction gear assemblies equipped with thrust sensitive switch assembly, P/N's 6792891, 6794122, 6794359, 6807776, 23005483, or 23005485. Compliance is required within 60 days after the effective date of this AD, unless already accomplished. To prevent the possibility of unwanted autofeather or the inability to autofeather when required, accomplish the following: Replace thrust sensitive switch assemblies, P/N's 6792891, 6794122, 6794359, 6807776, 23005483, and 23005485 with P/N 6870559, a single carbon contact switch assembly, in accordance with the detailed instructions provided in Allison Commercial Engine Alert Bulletin CEB-A-73-84, Revision 2, dated October 1, 1984, or FAA approved equivalent. 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. Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Chicago Aircraft Certification Office, FAA, 2300 East Devon Avenue, Des Plaines, Illinois 60018. Upon submission of substantiating data by an owner or operator through an FAA maintenance inspector, the Manager, Chicago Aircraft Certification Office, may adjust the compliance time specified in this AD. Allison Commercial Engine Alert Bulletin CEB-A-73-84, Revision 2, dated October 1, 1984, 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 Corp., P.O. Box 420, Indianapolis, Indiana 46206-0420. This document also may be examined at the Office of the Regional Counsel, FAA, ATTN: Rules Docket No. 82-ANE-50, 12 New England Executive Park, Burlington, Massachusetts 01803 and may be examined weekdays, except Federal holidays, between 8:00 a.m. and 4:30 p.m. This amendment becomes effective on September 15, 1986. FOOTER:
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Retrieved: Apr 8, 2026
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