AD 2011-18-52
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | S.p.A. | Airworthiness Directives; Agusta S.p.A. Helicopters |
Unsafe Condition
Cracks in the tail rotor (T/R) blades could lead to failure of a T/R blade and subsequent loss of control of the helicopter.
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Required Actions
Establish a revised life limit for each T/R blade and update historical records. Visually inspect T/R blades for cracks or damage at specified intervals. Replace T/R blades that exceed the life limit or show cracks or excessive damage.
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Compliance Time
Within 5 hours time-in-service (TIS) for establishing life limits and replacing blades that exceed limits. Visual inspections must occur within 25 hours TIS and at intervals not exceeding 25 hours TIS.
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Affected Aircraft
Agusta S.p.A. Model AB139 and AW139 helicopters with T/R blades, part numbers 3G6410A00131 or 4G6410A00131.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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