AD 79-10-03 R2
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | LO-360-E1A6D | AVCO LYCOMING Model O-360-E1A6D and O-320-H2AD Series Engines |
| engine | Lycoming Engines | O-320-H2AD | AVCO LYCOMING Model O-360-E1A6D and O-320-H2AD Series Engines |
| engine | Lycoming Engines | O-360-E1A6D | AVCO LYCOMING Model O-360-E1A6D and O-320-H2AD Series Engines |
Unsafe Condition
Loosening of the engine to aircraft mounting bracket attaching bolts (part number LW38-2.75) could cause loss of integrity of the engine mounting.
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Required Actions
Inspect the eight LW38-2.75 mounting bolts for correct torque. Replace bolts with torque 200 inch-pounds or less and retorque them to 360 inch-pounds. Retorque bolts between 200 and 360 inch-pounds to 360 inch-pounds.
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Compliance Time
Before further flight for O-360-E1A6D/LO-360-E1A6D engines, and within 50 hours after the effective date of this AD for O-320-H2AD model engines.
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Affected Aircraft
AVCO Lycoming Model O-360-E1A6D (serial numbers L-101-77 thru L-347-77, L-352-77), LO-360-E1A6D (serial numbers L-101-72 thru L-319-72, L-321-72 thru L-324-72, L-326-72 thru L-339-72, L-341-72 thru L-348-72, L-350-72) installed in Piper PA-44, and O-320-H2AD (serial numbers L-101-76 thru L-5707-76 or remanufactured before January 4, 1979) installed in Cessna 172N and Partenavia P-66C.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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