AD 2021-23-22
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Leonardo S.p.a. Helicopters |
Unsafe Condition
A crack in an MR damper, which could result in seizure of the MR damper, detachment of the MR damper in-flight, and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the MR damper rod end and MR damper body end for a crack; dye penetrant inspect or eddy current inspect certain rod and body ends for a crack; repetitively inspect the rod and body end bearings for rotation in the damper seat and for misaligned slippage marks; repetitively inspect the rod end broached ring nut; repetitively inspect the bearing friction torque value of the body and rod ends, and the MR damper anti-rotation block. Depending on the results of the various inspections, remove a part from service or replace a part.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before the first flight of the day
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Leonardo S.p.a. Model AB139 and AW139 helicopters with an MR damper part number (P/N) 3G6220V01351, 3G6220V01352, or 3G6220V01353 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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