AD Amdt-39-11419
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 412, 412EP and 412CF Helicopters |
| aircraft | Bell | Helicopter Textron | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 412, 412EP and 412CF Helicopters |
Unsafe Condition
Main rotor yoke assemblies manufactured below 0.478-inch thickness may not have the anticipated service life, leading to fatigue failure, loss of a main rotor blade, and subsequent loss of control of the helicopter.
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Required Actions
Inspect and measure the thickness of certain main rotor yoke assemblies. Add 500 hours time-in-service (TIS) to the total time for yokes measuring below 0.478-inch thickness and document the measurement and added TIS on the component history card or equivalent record.
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Compliance Time
Before further flight
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 412, 412EP, and 412CF helicopters.
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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