AD 75-22-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 501-D13 | DETROIT DIESEL ALLISON Model 501-D13 Series Engines |
| engine | Rolls-Royce Corporation | 501-D13A | DETROIT DIESEL ALLISON Model 501-D13 Series Engines |
| engine | Rolls-Royce Corporation | 501-D13D | DETROIT DIESEL ALLISON Model 501-D13 Series Engines |
| engine | Rolls-Royce Corporation | 501-D13E | DETROIT DIESEL ALLISON Model 501-D13 Series Engines |
| engine | Rolls-Royce Corporation | 501-D13H | DETROIT DIESEL ALLISON Model 501-D13 Series Engines |
Unsafe Condition
Second stage turbine wheels with specific serial numbers and part numbers 6829072 and 6847112 may develop hub spline cracks or microstructure degradation, leading to failure.
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Required Actions
Remove from service turbine wheels with specified serial numbers according to compliance schedules based on total cycles. Inspect for hub spline cracks using fluorescent penetrant method and classify microstructure per COIL-349. Wheels passing inspection may be returned to service with cycle limits.
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Compliance Time
Compliance required as indicated in paragraphs I, II, III, and IV, with specific removal schedules based on total cycles (e.g., within 200 cycles for wheels with 16,000+ cycles on effective date).
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Affected Aircraft
Rolls-Royce Corporation Model 501-D13, 501-D13A, 501-D13D, 501-D13E, 501-D13H engines with P/N 6829072 and 6847112 second stage turbine wheels and specified serial numbers listed in the AD.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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