AD 94-20-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206A | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 206A, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 206A, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B-1 | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 206A, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 206A, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L-1 | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 206A, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L-3 | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 206A, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L-4 | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 206A, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4 Helicopters |
Unsafe Condition
Mislocated master spline on the main rotor hub trunnion can cause pitch link misalignment, altered cyclic stick control position, loss of the main rotor system, and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the trunnion master spline for proper positioning within the next 50 hours time-in-service or 90 calendar days after the effective date, whichever occurs first. Replace any trunnion with a mislocated master spline before further flight.
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 (TIS) or 90 calendar days after the effective date of this airworthiness directive, whichever occurs first
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron Canada Limited Model 206A, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4 helicopters equipped with main rotor hub trunnion part numbers 206-011-113-103 or 206-011-120-103.
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.