AD 76-04-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206A | Airworthiness Directives; Bell Models 206A, 206B, 206A-1, and 206B-1 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206A-1 (OH-58A) | Airworthiness Directives; Bell Models 206A, 206B, 206A-1, and 206B-1 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B | Airworthiness Directives; Bell Models 206A, 206B, 206A-1, and 206B-1 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B-1 | Airworthiness Directives; Bell Models 206A, 206B, 206A-1, and 206B-1 Helicopters |
Unsafe Condition
Cracks in the main rotor hub yokes and nicks, scratches, or tool marks on yoke trunnion bore edges could lead to failure of the main rotor hub assembly.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove and inspect main rotor hub yokes for cracks using a 10-power magnifying glass or equivalent. Remove nicks, scratches, or tool marks on yoke trunnion bore edges as per Service Bulletin 206-04-1-74-1 or equivalent FAA procedure. Replace discrepant yokes before further flight.
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Compliance Time
within 200 hours' time in service after the effective date of this AD unless already accomplished
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Affected Aircraft
Bell Models 206A, 206B, 206A-1, and 206B-1 helicopters except those with main rotor hub yokes installed after August 11, 1974, and specific serial numbers listed (1174, 1192, etc.)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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