AD 94-13-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Enstrom Helicopter Corporation, The | 280C | Airworthiness Directives: The Enstrom Helicopter Corporation Model F-28C, F-28C-2, F-28F, 280C, 280F, and 280FX Series Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | 280F | Airworthiness Directives: The Enstrom Helicopter Corporation Model F-28C, F-28C-2, F-28F, 280C, 280F, and 280FX Series Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | 280FX | Airworthiness Directives: The Enstrom Helicopter Corporation Model F-28C, F-28C-2, F-28F, 280C, 280F, and 280FX Series Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28C | Airworthiness Directives: The Enstrom Helicopter Corporation Model F-28C, F-28C-2, F-28F, 280C, 280F, and 280FX Series Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28C-2 | Airworthiness Directives: The Enstrom Helicopter Corporation Model F-28C, F-28C-2, F-28F, 280C, 280F, and 280FX Series Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28F | Airworthiness Directives: The Enstrom Helicopter Corporation Model F-28C, F-28C-2, F-28F, 280C, 280F, and 280FX Series Helicopters |
Unsafe Condition
Cracked tail rotor spindles, part numbers 28-150064-11 or 28-150064-13, could fail leading to loss of directional control and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the spindle for cracks using a 5-power magnifying glass before further flight. Perform dye penetrant inspections for cracks under specific conditions (e.g., vibrations or frequent track/balance needs) and at intervals not exceeding 25 hours' time-in-service. Replace spindles with cracks or excessive surface defects, and remove/replace spindles reaching 1,200 hours' TIS.
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Compliance Time
Before further flight, within the next 25 hours' time-in-service, and at intervals not to exceed 25 hours' TIS from the last inspection. Spindles must be replaced within the next 100 hours' TIS or before reaching 1,200 hours' TIS, whichever occurs later.
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Affected Aircraft
Enstrom Helicopter Corporation Models F-28C, F-28C-2, F-28F, 280C, 280F, and 280FX series helicopters equipped with tail rotor spindle part numbers 28-150064-11 or 28-150064-13.
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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