AD 77-10-06
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 could lead to loss of directional control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace tail rotor drive shaft bearings, bearing hangers, retaining rings, and shaft segments as specified in items 1 through 7 of the AD. Modify the drive shaft cover per Bell Technical Bulletin 206-76-2. Install spring clamp type bearing hangers with the spring on the left side of the tail boom.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 100 hours time in service after the effective date of this Airworthiness Directive (AD), unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron Canada Limited Models 206A and 206B helicopters with serial numbers 1 through 1993, as specified by Tail Rotor Drive Shaft Installation Part Numbers 206-040-301-1, -7, -13, and -19.
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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