AD 79-25-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 501-D13 | DETROIT DIESEL ALLISON Model 501-D13, 501-D13A, 501-D13D, 501-D13E, and 501-D13H Engines |
| engine | Rolls-Royce Corporation | 501-D13A | DETROIT DIESEL ALLISON Model 501-D13, 501-D13A, 501-D13D, 501-D13E, and 501-D13H Engines |
| engine | Rolls-Royce Corporation | 501-D13D | DETROIT DIESEL ALLISON Model 501-D13, 501-D13A, 501-D13D, 501-D13E, and 501-D13H Engines |
| engine | Rolls-Royce Corporation | 501-D13E | DETROIT DIESEL ALLISON Model 501-D13, 501-D13A, 501-D13D, 501-D13E, and 501-D13H Engines |
| engine | Rolls-Royce Corporation | 501-D13H | DETROIT DIESEL ALLISON Model 501-D13, 501-D13A, 501-D13D, 501-D13E, and 501-D13H Engines |
Unsafe Condition
Second, third, and fourth stage turbine wheels with part numbers 6829072, 6847112, 6788833, 6842143, 6841223, 6846553, 6738424, and 6843014 may fail due to stress corrosion cracking or fatigue, leading to engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove second stage turbine wheels from service per FAA-approved revision of 501-D13 CSL-235 dated December 13, 1979. Remove third and fourth stage turbine wheels from service per FAA-approved revision of 501-D13 CSL-253 dated December 13, 1979.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as follows unless previously accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Rolls-Royce Corporation Model 501-D13, 501-D13A, 501-D13D, 501-D13E, and 501-D13H engines equipped with second, third, and fourth stage turbine wheels P/N's 6829072, 6847112, 6788833, 6842143, 6841223, 6846553, 6738424, and 6843014.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Second, Third, And Fourth Stage Turbine Wheels
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_79-25-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 79-25-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DETROIT DIESEL ALLISON Model 501-D13, 501-D13A, 501-D13D, 501-D13E, and 501-D13H Engines Subject: Second, Third, And Fourth Stage Turbine Wheels Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/13/1979 Make: Rolls-Royce Corporation Model: 501-D13 | 501-D13A | 501-D13D | 501-D13E | 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: 79-25-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3625 AD NUMBER: 79-25-03 SUBJECT HEADING: DETROIT DIESEL ALLISON Model 501-D13, 501-D13A, 501-D13D, 501-D13E, and 501-D13H Engines ACTION: SUMMARY: DATES: Effective December 13, 1979. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 79-25-03 DETROIT DIESEL ALLISON: Amendment 39-3625. Applies to Model 501-D13, 501-D13A, 501-D13D, 501-D13E, and 501-D13H engines equipped with second, third, and fourth stage turbine wheels P/N's 6829072, 6847112, 6788833, 6842143, 6841223, 6846553, 6738424, and 6843014. Compliance required as follows unless previously accomplished: (a) For second stage turbine wheels, remove from service in accordance with FAA approved revision of 501-D13 CSL-235 dated December 13, 1979. (b) For third and fourth stage turbine wheels, remove from service in accordance with FAA approved revision of 501-D13 CSL-253 dated December 13, 1979. Detroit Diesel Allison Commercial Service Letters 501-D13 CSL-235, 501-D13 CSL-253, and Commercial Overhaul Information Letter 501-D13 COIL-349 revised as of December 13, 1979 are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). The incorporated service documents may be obtained from Detroit Diesel Allison, Division of General Motors Corporation, Indianapolis, Indiana 46206. This amendment becomes effective on December 13, 1979. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_79-25-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 79-25-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DETROIT DIESEL ALLISON Model 501-D13, 501-D13A, 501-D13D, 501-D13E, and 501-D13H Engines Subject: Second, Third, And Fourth Stage Turbine Wheels Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/13/1979 Make: Rolls-Royce Corporation Model: 501-D13 | 501-D13A | 501-D13D | 501-D13E | 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: 79-25-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3625 AD NUMBER: 79-25-03 SUBJECT HEADING: DETROIT DIESEL ALLISON Model 501-D13, 501-D13A, 501-D13D, 501-D13E, and 501-D13H Engines ACTION: SUMMARY: DATES: Effective December 13, 1979. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 79-25-03 DETROIT DIESEL ALLISON: Amendment 39-3625. Applies to Model 501-D13, 501-D13A, 501-D13D, 501-D13E, and 501-D13H engines equipped with second, third, and fourth stage turbine wheels P/N's 6829072, 6847112, 6788833, 6842143, 6841223, 6846553, 6738424, and 6843014. Compliance required as follows unless previously accomplished: (a) For second stage turbine wheels, remove from service in accordance with FAA approved revision of 501-D13 CSL-235 dated December 13, 1979. (b) For third and fourth stage turbine wheels, remove from service in accordance with FAA approved revision of 501-D13 CSL-253 dated December 13, 1979. Detroit Diesel Allison Commercial Service Letters 501-D13 CSL-235, 501-D13 CSL-253, and Commercial Overhaul Information Letter 501-D13 COIL-349 revised as of December 13, 1979 are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). The incorporated service documents may be obtained from Detroit Diesel Allison, Division of General Motors Corporation, Indianapolis, Indiana 46206. This amendment becomes effective on December 13, 1979. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
Related Airworthiness Directives
2006-25-12
final ruleAirworthiness Directives; Rolls-Royce Corporation 501-D Series Turboprop Engines
Unsafe Condition: Uncontained turbine rotor failure resulting in an in-flight engine shutdown and possible damage to the airplane.
86-17-06
final ruleALLISON 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.
81-03-02
final ruleDETROIT DIESEL ALLISON Model 501-D13, 501-D13A, 501- D13D, 501-D13E, 501-D13H Engines
Unsafe Condition: Catastrophic wheel failures could occur subsequent to the specified cyclic intervals due to insufficient spline interference fit between turbine wheels and shafts.
80-14-13
final ruleDETROIT DIESEL ALLISON Model 501-D13, 501-D13A, 501- D13D, 501-D13E, and 501-D13H Engines
Unsafe Condition: Disc failures due to fatigue in the 1st stage turbine wheels with part numbers 6844061 and 6847111.