AD 86-12-01 L
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 214ST | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 214ST Helicopters |
Unsafe Condition
Loss of main rotor collective control due to a defective locking plate (Part Number 214-010-232-101) or improper torque of the lower collective hub nut (Part Number 214-010-407-001).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the locking plate per Part I of ASB 214ST-86-36. Check torque of the lower collective hub nut per Part IV of the same service bulletin. Subsequent inspections at each 'A' and 'B' checks per Parts II, III, and IV of the service bulletin.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to further flight after receipt of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron, Inc. Model 214ST helicopters, all serial numbers, certified in all categories.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.