AD 71-11-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | IO-360-A1A | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A1B | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A1B6 | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A1C | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A1D6 | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A2A | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A2B | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A2C | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-C1A | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-C1B | AVCO LYCOMING Model IO-360A and -C Series Engines |
Unsafe Condition
Valve failures due to the intake and exhaust hydraulic tappet plunger assembly P/N 76290.
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Required Actions
Replace the intake and exhaust hydraulic tappet plunger assembly P/N 76290 with P/N 78290 within the specified in-service time limits.
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Compliance Time
(a) Engines with less than 400 hours in service on P/N 76290 as of the effective date must comply prior to accumulating 450 hours in service. (b) Engines with 400 or more hours in service on P/N 76290 as of the effective date must comply within the next 50 hours in service.
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Affected Aircraft
AVCO Lycoming Model IO-360A and -C Series engines with serial numbers 1734-51A through 4412-51A and those remanufactured between 1 September 1965 and 11 October 1967.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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