AD 77-20-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Enstrom Helicopter Corporation, The | 280 | Airworthiness Directives; Enstrom Model F28, F28A, F28C, 280 and 280C Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | 280C | Airworthiness Directives; Enstrom Model F28, F28A, F28C, 280 and 280C Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28 | Airworthiness Directives; Enstrom Model F28, F28A, F28C, 280 and 280C Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28A | Airworthiness Directives; Enstrom Model F28, F28A, F28C, 280 and 280C Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28C | Airworthiness Directives; Enstrom Model F28, F28A, F28C, 280 and 280C Helicopters |
Unsafe Condition
Tail rotor spindle P/N 28-15202 may fail due to fatigue cracking, leading to loss of tail rotor control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace tail rotor spindle P/N 28-15202 with new P/N 28-15202-13 or manufacturer-reworked spindle with eight-character serial number. Install strike tabs P/N 28-17308 on blade leading edge.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 50 hours time in service or six (6) months calendar time, whichever occurs first
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Enstrom Models F28, F28A, F28C, 280, and 280C helicopters with 3.3 inch tail rotor blade and spindle P/N 28-15202
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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