AD Amdt-39-11474
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | S.p.A. Model AB412 | Airworthiness Directives; Agusta S.p.A. Model AB412 Helicopters |
Unsafe Condition
Fatigue failure of the main rotor yoke (yoke) due to insufficient thickness and margin of safety, which could lead to loss of a main rotor blade and subsequent loss of control of the helicopter.
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Required Actions
Remove and replace each main rotor yoke, part number (P/N) 412-010-101-123 or -127, with an airworthy yoke, P/N 412-010-101-129, before further flight.
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Compliance Time
Before further flight
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Affected Aircraft
Agusta S.p.A. Model AB412 helicopters with main rotor yoke, part number (P/N) 412-010-101-123 or -127, installed, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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