AD 78-07-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | T5508D | AVCO LYCOMING Model T5508D Engines. |
Unsafe Condition
Fatigue failure of the engine accessory inner bevel gear leading to engine stoppage.
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Required Actions
Remove inner bevel gear P/N 2-070-005-02 and replace with inner bevel gear assembly P/N 2-070-030-01, in accordance with Avco Lycoming Service Bulletin No. 5508-0013.
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Compliance Time
by May 1, 1978
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Affected Aircraft
Avco Lycoming T5508D model turboshaft engines.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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