AD Amdt-39-10421
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
Fatigue damage to the tail rotor yoke assembly due to unforeseen static and dynamic loading against the original flapping stop.
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Required Actions
Reduce the never-exceed velocity (Vne) limitation temporarily. Inspect the tail rotor yoke assembly for fatigue damage and install a redesigned yoke flapping stop. Perform recurring periodic and special inspections to detect yoke overload occurrences.
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Compliance Time
Before further flight
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Affected Aircraft
Bell Helicopter Textron Model 412 and Agusta S.p.A. Model AB412 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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