AD 97-19-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 214ST | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214ST 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 takeoffs and external load lifts using high-power settings, leading to main rotor system failure and loss of control.
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Required Actions
Create a component history card or equivalent record using a Retirement Index Number (RIN) system; track RIN increases based on takeoffs and external load lifts; replace all four bearing bolts if any are replaced, and remove bolts from service at an accumulated RIN of 17,000.
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Compliance Time
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 214ST helicopters with pillow block bearing bolts (P/N 20-057-12-48D or -50D) installed, 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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