AD Amdt-39-10990
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Bell Helicopter Textron Canada (BHTC) Model 407 Helicopters |
| aircraft | Bell | Various | Airworthiness Directives; Bell Helicopter Textron Canada (BHTC) Model 407 Helicopters |
Unsafe Condition
Failure of the engine-to-transmission driveshaft, leading to loss of engine drive to the rotor system, damage to critical structural components, and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the driveshaft with an airworthy driveshaft on or before the accumulation of 50 hours total time-in-service (TIS) on the driveshaft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
On or before the accumulation of 50 hours total time-in-service (TIS) on the driveshaft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron Canada (BHTC) Model 407 helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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