AD Amdt-39-10077
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 transmission upper planetary carrier due to unanticipated high number of torque events and time-in-service beyond original expectations.
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Required Actions
Revise the method of calculating retirement life from high-power events to a maximum accumulated Retirement Index Number (RIN) of 120,000. Implement the new RIN calculation method as specified in the approved data.
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Compliance Time
Before further flight
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 214B, 214B-1, and 214ST helicopters with the main transmission upper planetary carrier subject to this AD.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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