AD 59-13-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 501-D13 | ALLISON Models 501-D13 and -D13A Engines |
| engine | Rolls-Royce Corporation | 501-D13A | ALLISON Models 501-D13 and -D13A Engines |
Unsafe Condition
Spalling of the propeller shaft roller bearing due to high bearing loads caused by the propeller during certain aircraft flight conditions.
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Required Actions
Conduct a continuity check using a probe of the reduction gear magnetic plug at least every 10 flight hours. If metal chips are found as specified in Allison Maintenance Manual section 72-0, paragraph 8B, page 219, remove the gearbox.
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Compliance Time
Compliance required as indicated.
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Affected Aircraft
Allison Models 501-D13 and -D13A Engines not modified in accordance with Allison Commercial Engine Bulletin 72-74 and Lockheed Bulletin SB 262.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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