AD 2004-10-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Canada Model 407 | Airworthiness Directives; Bell Helicopter Textron Canada Model 407 Helicopters |
| aircraft | Bell | Helicopter Textron Canada Model 407 | Airworthiness Directives; Bell Helicopter Textron Canada Model 407 Helicopters |
Unsafe Condition
Failure of certain oil cooler blower bearings and segmented drive shaft bearings, leading to loss of tail rotor drive and subsequent loss of directional control.
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Required Actions
Replace specified oil cooler blower bearings and segmented drive shaft bearings. Modify oil cooler blower inlet ducts and airflow shields. Revise the rotorcraft flight manual (RFM) to remove temporary limitations and insert revised limitations. Revise inspection and lubrication requirements for specified bearings.
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Compliance Time
Before further flight
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Affected Aircraft
Bell Helicopter Textron Canada Model 407 helicopters, as applicable per the amendment's detailed specifications.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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