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.
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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.
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Compliance Time
Compliance required as follows unless previously accomplished
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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.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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