AD 2022-11-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Leonardo S.p.a. Helicopters |
Unsafe Condition
A large crack detected on the tail gearbox (TGB) fitting during a scheduled inspection and the determination that certain TGB fittings are required to be inspected by the use of a borescope.
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Required Actions
Perform a one-time borescope inspection of certain part-numbered TGB fittings, and depending on the inspection results, remove the affected part from service and replace with an airworthy part, as specified in EASA AD 2021-0259.
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Compliance Time
Before further flight
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Affected Aircraft
Leonardo S.p.a. Model AB139 and AW139 helicopters, with certain part-numbered TGB fittings installed, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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