AD 2001-09-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 412 Helicopters and Agusta S.p.A. Model AB412 Helicopters |
| aircraft | Bell | Helicopter Textron | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 412 Helicopters and Agusta S.p.A. Model AB412 Helicopters |
Unsafe Condition
Static and dynamic overload damage to the tail rotor yoke assembly that could result in loss of the tail rotor and subsequent loss of control of the helicopter.
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Required Actions
Review historical records of the yoke assembly for overload damage; replace the yoke if damage is indicated; install a Vne red line at 120 knots KIAS; install a placard; insert applicable temporary revisions into the RFM; within 180 days, remove and replace the yoke assembly with an airworthy one; install an airworthy tail rotor flapping stop; remove temporary measures after compliance; and conduct recurring inspections at intervals not exceeding 25 hours TIS.
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Compliance Time
Within 180 calendar days
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 412, 412CF, and 412EP helicopters and Agusta S.p.A. Model AB412 helicopters, with tail rotor yoke assembly, part number 212-011-702-all dash numbers, installed, certificated in any category.
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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