AD 2011-26-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Enstrom | Helicopter Corporation | Airworthiness Directives; Enstrom Helicopter Corporation Helicopters |
Unsafe Condition
Failure of the cyclic trim system, specifically involving trim relays part-number KUP14D55-472, M83536/10-015M, or M83536/10-024M, which can lead to reduced controllability and potential loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the actuator and limit switch bracket in the lateral and longitudinal trim actuator assemblies to provide a positive stop for the trim actuator. Perform operational (ground) and flight tests to verify the trim relay is functioning correctly after modification.
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Compliance Time
Within 5 hours time-in-service (TIS) or at the next annual or 100 hour time-in-service inspection, whichever occurs first.
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Affected Aircraft
Enstrom Helicopter Corporation Model F-28C, F-28C-2, F-28F, 280C, 280F, 280FX, TH-28, 480, and 480B helicopters equipped with trim relays part-number KUP14D55-472, M83536/10-015M, or M83536/10-024M.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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