AD 87-10-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206A | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. (BHTI) Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. (BHTI) Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. (BHTI) Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L-1 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. (BHTI) Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L-3 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. (BHTI) Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
Unsafe Condition
Failure of the main rotor mast.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Determine if an affected serial number main rotor mast is installed before further flight. Remove the affected mast within 25 hours' time in service after receipt of this AD but no later than May 31, 1987, and replace it with an airworthy part.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 25 hours' time in service after receipt of this AD but no later than May 31, 1987
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron Inc. Model 206A, 206B, 206L, 206L-1, and 206L-3 helicopters with specific main rotor mast serial numbers as listed in the AD: P/N 206-010-332-121 (Model 206A/B) and P/N 206-040-535-105 (Model 206L/L-1/L-3).
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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