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.
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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.
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Compliance Time
Required as indicated.
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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.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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