AD 97-15-04
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 main transmission upper planetary carrier (carrier), which could result in failure of the main transmission and subsequent loss of control of the helicopter.
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Required Actions
Create a component history card or equivalent record for the carrier. Determine and record the accumulated Retirement Index Number (RIN) to date using specified calculation methods based on model and operation type. Remove the carrier from service on or before attaining an accumulated RIN of 120,000.
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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 main transmission upper planetary carrier (part number 214-040-077-007 or -101) installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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