AD 2020-22-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Model AS350B | Airworthiness Directives; Airbus Helicopters |
Unsafe Condition
A missing main rotor gearbox (MGB) suspension bar attachment bolt head was discovered during scheduled maintenance of a Model EC 130 T2 helicopter. This condition could lead to fatigue failure of other affected bolts of the same MGB bracket, possibly resulting in loss of the MGB suspension bar and consequently loss of helicopter control.
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Required Actions
Visually inspect each MGB suspension bar attachment bracket for missing bolt heads. If one bolt head is missing, perform actions specified in the service information including measuring the tightening torque of the remaining bolts of that bracket, removing the attachment bracket bolts, washers, and nuts of that bracket, and sending photos and reporting certain information to Airbus Helicopters. If two or more bolt heads are missing, repairs in accordance with an FAA-approved method are required.
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Compliance Time
Before further flight
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Affected Aircraft
Airbus Helicopters Model AS350B, AS350B1, AS350B2, AS350B3, AS350BA, AS350C, AS350D, AS350D1, AS355E, AS355F, AS355F1, AS355F2, AS355N, AS355NP, EC130B4, and EC130T2 helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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