AD 87-11-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 214B | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 214ST, 214B and 214B-1 Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214B-1 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 214ST, 214B and 214B-1 Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214ST | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 214ST, 214B and 214B-1 Helicopters |
Unsafe Condition
Failure of the collective hub locking plate due to the use of P/N 214-010-232-101 lower locking plate and P/N 214-010-231-101 upper locking plate.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the lower and upper locking plates with P/N 214-010-569-101 within 50 hours' time in service or 30 days after the effective date, whichever comes first. Subsequent inspections for slippage every 25 hours' time in service and cracks every 500 hours' time in service, with replacement if cracks are found. Retorque the lower hub nut and install the new locking plate as required.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 50 hours' time in service or within 30 days after the effective date of this AD, whichever comes first
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 214ST (S/N 28101-28159), 214B, and 214B-1 (S/N 28001-28070) helicopters equipped with P/N 214-010-231-101 upper and 214-010-232-101 lower locking plates.
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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