AD 59-21-03
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
Compressor blade retention failures, including bulging and separation of the compressor case and flash fire inside the cowling during ground running.
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Required Actions
Install first stage compressor wheel assembly P/N 67 92821 or P/N 67 93351, or compressor rotor assembly P/N 67 92332. Modifications are covered by Allison Commercial Engine Bulletins 61, 80, or the new design.
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Compliance Time
not later than November 15, 1959
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Affected Aircraft
ALLISON Models 501-D13 and -D13A Engines
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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