AD 2021-04-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Model AS350B | Airworthiness Directives; Airbus Helicopters |
Unsafe Condition
A missing retaining ring of the inner race of the MRM upper bearing can lead to an unlimited shift of the inner race and compromise the function of the MRM upper bearing, potentially resulting in loss of control of the helicopter.
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Required Actions
Inspect the upper and lower retaining rings of the inner race of the MRM upper bearing to verify their presence and correct installation, and perform a repetitive inspection of the sealant bead on the MRM for damage. If damage is found, repair or replace the MRM.
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Compliance Time
Within 660 hours TIS or 6 months, whichever occurs first.
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Affected Aircraft
All Airbus Helicopters Model AS350B, AS350BA, AS350B1, AS350B2, AS350B3, and AS350D helicopters; Model AS355E, AS355F, AS355F1, AS355F2, AS355N, and AS355NP helicopters; and Model EC130 B4 and EC130 T2 helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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