AD 99-26-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta S.p.A. | AB412 | Airworthiness Directives; Agusta S.p.A. Model AB412 Helicopters |
| aircraft | Agusta S.p.A. | AB412 EP | Airworthiness Directives; Agusta S.p.A. Model AB412 Helicopters |
Unsafe Condition
Fatigue failure of a main rotor yoke (yoke) could result in loss of a main rotor blade and subsequent loss of control of the helicopter due to the yokes being on the low end of the manufacturer’s tolerance for thickness and lacking the desired margin of safety.
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Required Actions
Remove and replace each main rotor yoke, part number 412-010-101-123 or -127, with an airworthy yoke, part number 412-010-101-129 before further flight. Alternative methods of compliance may be approved by the FAA if they provide an acceptable level of safety.
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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 numbers 412-010-101-123 or -127 installed, 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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