AD 97-06-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 214B | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B, 214B-1 and 214ST Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214B-1 | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B, 214B-1 and 214ST Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214ST | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B, 214B-1 and 214ST Helicopters |
Unsafe Condition
Fatigue failure of the lower planetary spider (spider) due to unanticipated higher number of external load lifts and takeoffs (torque events), which could result in main transmission failure and subsequent loss of control of the helicopter.
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Required Actions
Create a component history card for the spider. Determine and record accumulated Retirement Index Number (RIN) based on takeoffs, external load lifts, or time-in-service. Remove the spider when accumulated RIN reaches 80,000.
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Compliance Time
Required within 25 hours time-in-service (TIS) after the effective date of this AD, unless accomplished previously.
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 214B, 214B-1, and 214ST helicopters with lower planetary spider part numbers 214-040-080-001, -101.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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