AD 69-21-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 501-D13 | ALLISON Models 501-D13 and 501-D22 Series Engines |
| engine | Rolls-Royce Corporation | 501-D13A | ALLISON Models 501-D13 and 501-D22 Series Engines |
| engine | Rolls-Royce Corporation | 501-D13D | ALLISON Models 501-D13 and 501-D22 Series Engines |
| engine | Rolls-Royce Corporation | 501-D13E | ALLISON Models 501-D13 and 501-D22 Series Engines |
| engine | Rolls-Royce Corporation | 501-D13H | ALLISON Models 501-D13 and 501-D22 Series Engines |
| engine | Rolls-Royce Corporation | 501-D22 | ALLISON Models 501-D13 and 501-D22 Series Engines |
| engine | Rolls-Royce Corporation | 501-D22A | ALLISON Models 501-D13 and 501-D22 Series Engines |
| engine | Rolls-Royce Corporation | 501-D22C | ALLISON Models 501-D13 and 501-D22 Series Engines |
| engine | Rolls-Royce Corporation | 501-D22G | ALLISON Models 501-D13 and 501-D22 Series Engines |
Unsafe Condition
First stage compressor wheels with balance weight pin holes in the front lip of the outer rim may exceed life limit margin, leading to potential failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect first stage compressor wheels in accordance with specified Allison Commercial Service Letters or approved method. Remove from service based on cycle limits or inspection results. Ensure no wheel exceeds 25,100 cycles.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Required as indicated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Rolls-Royce Corporation Models 501-D13 (including variants D13A, D13D, D13E, D13H) and 501-D22 (including variants D22A, D22C, D22G) engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
First Stage Compressor Wheels
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_69-21-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 69-21-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: ALLISON Models 501-D13 and 501-D22 Series Engines Subject: First Stage Compressor Wheels Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/21/1969 Make: Rolls-Royce Corporation Model: 501-D13 | 501-D13A | 501-D13D | 501-D13E | 501-D13H | 501-D22 | 501-D22A | 501-D22C | 501-D22G 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: 69-21-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-862 AD NUMBER: 69-21-03 SUBJECT HEADING: ALLISON Models 501-D13 and 501-D22 Series Engines ACTION: SUMMARY: DATES: Effective October 21, 1969 ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 69-21-03 ALLISON GAS TURBINE DIVISION Amendment 39-862. Applies to Models 501-D13 and 501-D22 Series Engines. Compliance: Required as indicated. To insure adequate life limit margin for Allison P/Ns 6738651, 6788581, 6789681, 6805651, 6805701, 6844081, and 6829661 first stage compressor wheels with balance weight pin holes in the front lip of the outer rim, accomplish the following: (A) Wheels which have 16,000 cycles or less on September 30, 1969, shall be removed from service prior to reaching 19,000 cycles or, unless already accomplished, must be inspected in accordance with Allison Commercial Service Letter CSL-120 Supplement dated October 2, 1969, or Allison Commercial Service Letter 501-D22 CSL-1001 Supplement dated October 2, 1969, or any other method approved by the Chief, Engineering and Manufacturing Branch, Central Region. (B) Wheels which exceeded 16,000 cycles on September 30, 1969, must be removed from service in accordance with Inspection/Removal Chart contained on page 3 of Allison Commercial Service Letter CSL-120 Supplement dated October 2, 1969, or contained on page 3 of Allison Commercial Service Letter 501-D22 CSL- 1001 Supplement dated October 2, 1969, unless inspected in accordance with said Allison Commercial Letters. (C) No first stage compressor wheels shall remain in service beyond 25,100 cycles. (D) For the purposes of this airworthiness directive, a cycle is defined as one takeoff. This amendment becomes effective October 21, 1969. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_69-21-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 69-21-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: ALLISON Models 501-D13 and 501-D22 Series Engines Subject: First Stage Compressor Wheels Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/21/1969 Make: Rolls-Royce Corporation Model: 501-D13 | 501-D13A | 501-D13D | 501-D13E | 501-D13H | 501-D22 | 501-D22A | 501-D22C | 501-D22G 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: 69-21-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-862 AD NUMBER: 69-21-03 SUBJECT HEADING: ALLISON Models 501-D13 and 501-D22 Series Engines ACTION: SUMMARY: DATES: Effective October 21, 1969 ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 69-21-03 ALLISON GAS TURBINE DIVISION Amendment 39-862. Applies to Models 501-D13 and 501-D22 Series Engines. Compliance: Required as indicated. To insure adequate life limit margin for Allison P/Ns 6738651, 6788581, 6789681, 6805651, 6805701, 6844081, and 6829661 first stage compressor wheels with balance weight pin holes in the front lip of the outer rim, accomplish the following: (A) Wheels which have 16,000 cycles or less on September 30, 1969, shall be removed from service prior to reaching 19,000 cycles or, unless already accomplished, must be inspected in accordance with Allison Commercial Service Letter CSL-120 Supplement dated October 2, 1969, or Allison Commercial Service Letter 501-D22 CSL-1001 Supplement dated October 2, 1969, or any other method approved by the Chief, Engineering and Manufacturing Branch, Central Region. (B) Wheels which exceeded 16,000 cycles on September 30, 1969, must be removed from service in accordance with Inspection/Removal Chart contained on page 3 of Allison Commercial Service Letter CSL-120 Supplement dated October 2, 1969, or contained on page 3 of Allison Commercial Service Letter 501-D22 CSL- 1001 Supplement dated October 2, 1969, unless inspected in accordance with said Allison Commercial Letters. (C) No first stage compressor wheels shall remain in service beyond 25,100 cycles. (D) For the purposes of this airworthiness directive, a cycle is defined as one takeoff. This amendment becomes effective October 21, 1969. 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.