AD 55-02-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | O-320-A1A | LYCOMING Model O-320 Engines |
| engine | Lycoming Engines | O-320-A2A | LYCOMING Model O-320 Engines |
Unsafe Condition
Rapid loss of engine oil from the engine accessory drive adapter gasket location leading to immediate forced landings.
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Required Actions
Inspect to ensure the proper gasket (Lycoming P/N 69551) is installed under the lower accessory drive adapter cover. Install the specified gasket for engines with fixed pitch propellers.
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Compliance Time
As soon as possible but not later than February 28, 1955.
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Affected Aircraft
Lycoming Engines Model O-320 engines below serial number 612 installed in aircraft equipped with fixed pitch propellers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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