AD 60-07-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 501-D13D | ALLISON Models 501-D13D and 501-D13E Engines |
| engine | Rolls-Royce Corporation | 501-D13E | ALLISON Models 501-D13D and 501-D13E Engines |
Unsafe Condition
Third stage turbine blade failures due to resonance at low speed ground idle, resulting in damage to fourth stage blades and vanes, and in one case failure of turbine inlet case-vane case split line bolts.
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Required Actions
Aircraft without vibration detection equipment must limit low speed ground idle to 4 minutes total and inspect fourth stage turbine blades every 25 hours of operation. Aircraft with vibration detection must inspect blades upon arrival at the next maintenance base if vibrations exceed normal. Engines modified with P/N 6794773 blades are exempt.
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Compliance Time
within the next 25 hours of operation
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Affected Aircraft
Rolls-Royce Corporation Models 501-D13D and 501-D13E Engines
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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