AD 2021-05-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta S.p.A. | Various | Airworthiness Directives; Leonardo S.p.a. (Type Certificate Previously Held by Agusta S.p.A.) Helicopters |
Unsafe Condition
excessive play of the bearing in the main rotor rotating scissors, which could result in failure of the main rotor rotating scissor bearing and loss of helicopter control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
inspect the main rotor rotating scissors to monitor the bearings, replace the bearing with a new part-numbered bearing, and install a special nut in case of lower scissor bearing dislodging.
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Compliance Time
Within 100 hours time-inservice (TIS) after the effective date of this AD.
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Affected Aircraft
Leonardo S.p.a. Model AB139 and AW139 helicopters, certified in any category, with main rotor (M/R) rotating scissors with a lower half scissor spherical bearing (bearing) P/N 3G6230V00654 installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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