AD 97-06-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 214ST | Airworthiness Directives; Bell Helicopter Textron, Inc. (BHTI) Model 214ST Helicopters |
Unsafe Condition
Fatigue failure of the main rotor mast (mast) due to an unanticipated high number of takeoffs and external load lifts in addition to deterioration in strength under other operating conditions.
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Required Actions
Create a component history card or equivalent record for the mast, determine and record the accumulated Retirement Index Number (RIN) based on part number, maintain daily RIN counts for takeoffs and external load lifts, and remove the mast when the accumulated RIN reaches 140,000.
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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 214ST helicopters with main rotor mast part numbers 214-040-090-109 or 214-040-090-121 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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