AD 2001-13-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Canada Model 206L-4 | Airworthiness Directives; Bell Helicopter Textron Canada Model 206L-4, 407, and 427 Helicopters |
| aircraft | Bell | Helicopter Textron Canada Model 206L-4 | Airworthiness Directives; Bell Helicopter Textron Canada Model 206L-4, 407, and 427 Helicopters |
Unsafe Condition
Cracking of the flexframe on the forward end of the driveshaft, which can lead to driveshaft failure, loss of drive to the main rotor system, and a subsequent emergency forced landing.
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Required Actions
Visually inspect each driveshaft for a crack, a loose bolt or nut, or red powder residue. Replace the driveshaft with an airworthy one before further flight if any of these conditions are found. Notify the FAA within 10 days if a driveshaft is replaced.
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Compliance Time
Before further flight
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Affected Aircraft
Bell Helicopter Textron Canada Model 206L-4, 407, and 427 helicopters where driveshaft part number 206-340-300-105 has been installed on a Model 407 helicopter.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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