AD 99-05-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 214B | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B and 214B-1 Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214B-1 | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B and 214B-1 Helicopters |
Unsafe Condition
Fatigue failure of the pillow block bearing bolts (part numbers 20-057-12-48D or -50D) due to unanticipated high number of lifts and takeoffs (torque events) and time-in-service, which could result in main rotor system failure and loss of control.
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Required Actions
Create a Retirement Index Number (RIN) component history card or equivalent record for the bearing bolts. Calculate and record historical accumulated RIN using specified factors based on operation type and flight hours. Track and increase accumulated RIN daily by 1 per takeoff or external load lift, or 2 for elevation differences ≥200 feet. Remove bolts from service at 17,000 RIN. Replace all four bolts if any are replaced.
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Compliance Time
Within 25 hours time-in-service
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 214B and 214B-1 helicopters, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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