AD 77-15-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Enstrom Helicopter Corporation, The | 280C | Airworthiness Directives; Enstrom Model F28C and 280C Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28C | Airworthiness Directives; Enstrom Model F28C and 280C Helicopters |
Unsafe Condition
Fatigue cracking of the tail rotor pitch link retainer assembly (P/N 28-16320) around the circular hub and arm base could result in tail rotor pitch link failure.
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Required Actions
Perform a dye penetrant inspection around the circular hub and arm base of the pitch link retainer assembly P/N 28-16320. Replace the wide chord tail rotor pitch link assembly P/N 28-16320 and two guide bolts P/N 28-16307 with new assembly P/N 28-16325 and guide bolts P/N 28-16324.
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Compliance Time
Before further flight and within ten (10) hours time in service after receipt of the airmail letter.
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Affected Aircraft
Enstrom Models F28C and 280C helicopters with wide chord (4.4 inch) tail rotor blades.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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