AD 63-14-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | IO-540-A1A5 | LYCOMING Model O-540 Series Engines and IO-540 Series Engines |
| engine | Lycoming Engines | IO-540-B1A5 | LYCOMING Model O-540 Series Engines and IO-540 Series Engines |
| engine | Lycoming Engines | IO-540-B1B5 | LYCOMING Model O-540 Series Engines and IO-540 Series Engines |
| engine | Lycoming Engines | IO-540-B1C5 | LYCOMING Model O-540 Series Engines and IO-540 Series Engines |
| engine | Lycoming Engines | IO-540-C1B5 | LYCOMING Model O-540 Series Engines and IO-540 Series Engines |
| engine | Lycoming Engines | IO-540-E1A5 | LYCOMING Model O-540 Series Engines and IO-540 Series Engines |
| engine | Lycoming Engines | IO-540-G1A5 | LYCOMING Model O-540 Series Engines and IO-540 Series Engines |
| engine | Lycoming Engines | O-540-A1A | LYCOMING Model O-540 Series Engines and IO-540 Series Engines |
| engine | Lycoming Engines | O-540-A1A5 | LYCOMING Model O-540 Series Engines and IO-540 Series Engines |
| engine | Lycoming Engines | O-540-A1B5 | LYCOMING Model O-540 Series Engines and IO-540 Series Engines |
Unsafe Condition
Oil pump drive shaft (P/N 67512 or 74641) damage could occur, leading to oil pump failure and subsequent engine failure.
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Required Actions
Inspect the oil pump drive shaft per Lycoming Service Bulletin No. 295. Replace damaged shafts before further flight. Continue inspections until P/N 67512 (redesigned) or P/N 74641 is installed, after which inspections may stop.
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Compliance Time
Within 25 hours' time in service after the effective date and every 100 hours' time in service thereafter, with specific adjustments based on engine's time in service as of the effective date.
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Affected Aircraft
Lycoming Engines, Model O-540 Series (Serial Numbers 101-40 through 6129-40) and IO-540 Series (Serial Numbers 101-48 through 551-48) that do not incorporate Oil Pump Drive Shaft P/N 67512 (redesigned) or 74641.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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