AD 2018-10-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Bell Helicopter Textron Canada Limited (Bell) Helicopters |
| aircraft | Bell | 407 | Airworthiness Directives; Bell Helicopter Textron Canada Limited (Bell) Helicopters |
Unsafe Condition
A report of an in-flight failure of the tail rotor drive system, which resulted in loss of directional control, revealed severely worn splines connecting the adapter part number (P/N) 406-040-328-105 to the shaft assembly P/N 407-040-330-107.
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Required Actions
Inspect repetitively the tail rotor driveshaft segment assemblies for rotational and axial play between the adapter and the tail rotor driveshaft, and perform a one-time verification of the installation torque of each adapter retention nut.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
Bell Model 407 helicopters
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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