AD 80-04-03 R2
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | LO-360-E1A6D | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E, TO-360-E and LTO-360-E Series Engines |
| engine | Lycoming Engines | LTO-360-E1A6D | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E, TO-360-E and LTO-360-E Series Engines |
| engine | Lycoming Engines | O-320-H1AD | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E, TO-360-E and LTO-360-E Series Engines |
| engine | Lycoming Engines | O-320-H1BD | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E, TO-360-E and LTO-360-E Series Engines |
| engine | Lycoming Engines | O-320-H2AD | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E, TO-360-E and LTO-360-E Series Engines |
| engine | Lycoming Engines | O-320-H2BD | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E, TO-360-E and LTO-360-E Series Engines |
| engine | Lycoming Engines | O-320-H3AD | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E, TO-360-E and LTO-360-E Series Engines |
| engine | Lycoming Engines | O-320-H3BD | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E, TO-360-E and LTO-360-E Series Engines |
| engine | Lycoming Engines | O-360-E1A6D | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E, TO-360-E and LTO-360-E Series Engines |
| engine | Lycoming Engines | TO-360-E1A6D | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E, TO-360-E and LTO-360-E Series Engines |
Unsafe Condition
Bent push rods and hydraulic lifter spalling causing excessive wear and oil system contamination.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace upper exhaust valve spring seats and hydraulic lifters on specified engines. Add oil additive at each oil change or 50-hour interval. Inspect lubrication system for metal contaminants every oil change or 50 hours, and inspect camshafts and lifters if contaminants are found. Notify the FAA if contaminants are detected on engines with 'T mod' modification.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 50 hours in service after the effective date of this AD, and at subsequent intervals as specified.
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Affected Aircraft
AVCO Lycoming Model O-320-H, O-360-E, LO-360-E, TO-360-E, and LTO-360-E series engines (all serial numbers and hydraulic lifter configurations).
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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