AD 72-11-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Enstrom Helicopter Corporation, The | F-28A | Airworthiness Directives; Enstrom Model F-28A Helicopters |
Unsafe Condition
Failure of tail rotor drive taper pins with subsequent loss of directional control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the 2 forward and 3 aft AN386 taper pins for looseness within 10 hours' time in service after the effective date. Replace all loose taper pins with AN386-2-8A taper pins from Enstrom or approved sources. Replace all AN386 taper pins with AN386-2-8A pins within 25 hours' time in service after the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 10 hours' time in service after the effective date of this AD and within 25 hours' time in service after the effective date of this AD
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Affected Aircraft
Enstrom Model F-28A helicopters (Serial Numbers 1 through 83)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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