AD 2021-15-52
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Inc | Airworthiness Directives; Various Restricted Category Helicopters |
| aircraft | Bell | Textron Inc | Airworthiness Directives; Various Restricted Category Helicopters |
Unsafe Condition
A pin part number (P/N) 204-012-104-005 with a serial number (S/N) prefix 'FNFS' sheared off during flight, resulting in the main rotor blade and the main rotor head detaching from the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove pins P/N 204-012-104-005 with an S/N prefix 'FNFS' before further flight. Prohibit installing those pins on any helicopter as of the effective date of this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Restricted category helicopters originally manufactured by Bell Textron Inc., including but not limited to, Rotorcraft Development Corporation Model HH-1K helicopters, Robinson Air Crane Inc.; Rotorcraft Development Corporation; and Tamarack Helicopters, Inc., Model TH-1F helicopters, and others.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.