AD Amdt-39-10033
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 412 and 412EP Helicopters |
| aircraft | Bell | Helicopter Textron | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 412 and 412EP Helicopters |
Unsafe Condition
Fatigue failure of the main rotor mast or spline plate due to unanticipated high number of takeoffs and external load lifts utilizing high power settings, in addition to time-in-service accrued under normal operating conditions.
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Required Actions
Create a component history card or equivalent record using a Retirement Index Number (RIN) system; establish a system for tracking accumulated RIN; and set a maximum accumulated RIN for certain main rotor masts and spline plates.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 412 and 412EP 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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