AD 78-16-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206A | Airworthiness Directives; Bell Model 206A and 206B Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B | Airworthiness Directives; Bell Model 206A and 206B Helicopters |
Unsafe Condition
Failure of the tail rotor drive shaft due to insufficient support from the bearing hangers could result in loss of directional control.
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Required Actions
Replace the tail rotor drive shaft bearing hangers with improved spring type hangers (P/N 206-040-345-9, 206-040-355-1, 206-040-346-17, or 206-040-338-9) as specified. Modify the drive shaft cover per Technical Bulletin No. 206-76-2. Compliance must follow applicable maintenance instructions and Service Bulletin 206-77-9.
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Compliance Time
within the next 500 hours time in service after the effective date of this airworthiness directive unless already accomplished
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Affected Aircraft
Bell Helicopter Textron Canada Limited Models 206A and 206B, serial numbers 148 and 414 through 913
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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