AD 92-06-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206A | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L-1 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L-3 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
Unsafe Condition
Premature wear of the main transmission sungear, part number 206-040-662-101, and mating spur gears due to insufficient tip relief or improper tooth profile, which could result in transmission failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace listed main transmission sungears with serial numbers SD-0005 through SD-0071 (as listed in the AD) by the next inspection interval or within 1,500 hours' time in service after April 13, 1992. Inspect mating spur gears for micro pitting or hardlines in the gear teeth; replace those exceeding specified limits before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
At the next inspection interval for the main transmission sungear, but no later than 1,500 hours' time in service after the effective date 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 206A, 206B, 206L, 206L-1, and 206L-3 helicopters with main transmission sungear part number 206-040-662-101 installed.
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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