AD 98-12-22
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 407 | Airworthiness Directives; Bell Helicopter Textron Canada Model 407 Helicopters |
Unsafe Condition
Failure of the tail rotor drive system bearing supports, which could result in excessive tail rotor drive system vibration, loss of tail rotor drive, 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
Shim the tail rotor drive system bearing supports in accordance with Bell Helicopter Textron Alert Service Bulletin No. 407-97-7. An alternative method of compliance or adjustment of the compliance time may be approved by the Manager, Rotorcraft Certification Office.
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Compliance Time
Within 25 hours time-in-service, unless accomplished previously.
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Affected Aircraft
Bell Helicopter Textron Canada Model 407 helicopters, serial numbers 53000, 53002 through 53065, 53067, and 53069 through 53075, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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