AD Amdt-39-10717
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B, 214B-1, and 214ST Helicopters |
| aircraft | Bell | Helicopter Textron | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B, 214B-1, and 214ST Helicopters |
Unsafe Condition
Fatigue failure of the main rotor trunnion due to unanticipated higher number of torque events (lifts or takeoffs) leading to premature failure than originally anticipated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the method of calculating retirement life for the main rotor trunnion from high-power events to a maximum accumulated Retirement Index Number (RIN).
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 214B, 214B-1, and 214ST 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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