AD Amdt-39-9959
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 lower planetary spider due to unanticipated higher number of external load lifts and takeoffs (torque events) leading to failure of the main transmission and subsequent loss of control.
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Required Actions
Revise the AFM to change the spider retirement life calculation from high-power events to a maximum accumulated RIN of 80,000. Apply the RIN requirement to an additional part-numbered spider.
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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 specified spiders.
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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