AD 78-23-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | IO-540-G1B5 | AVCO LYCOMING Model IO-540-G1B5, -K1F5, -P1A5 and -S1A5 Series Engines |
| engine | Lycoming Engines | IO-540-K1F5 | AVCO LYCOMING Model IO-540-G1B5, -K1F5, -P1A5 and -S1A5 Series Engines |
| engine | Lycoming Engines | IO-540-P1A5 | AVCO LYCOMING Model IO-540-G1B5, -K1F5, -P1A5 and -S1A5 Series Engines |
| engine | Lycoming Engines | IO-540-S1A5 | AVCO LYCOMING Model IO-540-G1B5, -K1F5, -P1A5 and -S1A5 Series Engines |
Unsafe Condition
Fuel leakage due to failure of the fuel pump to fuel injector tube elbow.
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Required Actions
Replace the fuel pump to fuel injector tube part number LW-10445 and the fuel pump to fuel injector tube elbow part number LW-10446 with flexible hose assembly part number LW-12877-6-051.
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Compliance Time
within the next 50 hours' in service after the effective date of this AD, unless already accomplished
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Affected Aircraft
AVCO Lycoming Model IO-540-G1B5, -K1F5, -P1A5, and -S1A5 series engines with serial numbers up to and including L-17835-48 or -45A and engines overhauled by Lycoming prior to March 30, 1978.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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