AD 65-03-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | IO-320-B1A | LYCOMING Model IO- 320-BIA Engines |
Unsafe Condition
Crankshaft flange failure with a possible loss of propeller
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Required Actions
Add an operating limitation to the airplane flight manual prohibiting exceeding 2,100 r.p.m. engine speed during power-on-stalls. Inspect engines according to Lycoming Service Bulletin No. 300A before further flight after acrobatic maneuvers or exceeding the rpm limit. Remove crankshafts with cracks from service before further flight.
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Compliance Time
before further flight
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Affected Aircraft
Lycoming Model IO-320-BIA Engines equipped with Hartzell HC-E2YL-2/7663-4 Propellers and installed in Piper Model PA-30 Aircraft
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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