AD 2023-03-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Leonardo S.p.a. Helicopters |
Unsafe Condition
a damaged tail rotor duplex bearing (TRDB) that was improperly installed on a sliding control assembly, and to prevent a TRDB from remaining in service beyond its life limit.
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Required Actions
repetitively inspect certain TRDBs and depending on the results, replacing the TRDB or tail rotor actuator (TRA), or as an option, replacing the sliding control assembly. Additionally, replace an affected TRDB with a serviceable TRDB at a specified threshold and prohibit the installation of certain TRDBs or sliding control assemblies on any helicopter.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
Leonardo S.p.a. Model AB139 and AW139 helicopters, 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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