AD 2017-06-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Model EC120B | Airworthiness Directives; Airbus Helicopters |
Unsafe Condition
Wear of the spline joint on the pulley can exceed its capability to ensure power transmission to the tail rotor shaft, potentially resulting in the loss of tail rotor drive and subsequent loss of directional control.
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Required Actions
Before further flight and at intervals not to exceed 25 hours time-in-service, remove the pulley and visually inspect the pulley splines for wear. Inspect the exposed portion of the wheel splines for cracks, scoring, metal pick-up, and measure for wear. Replace the pulley if any splines are not straight, have inconsistent cross-sections, or show localized material deformation or loss. Replace the wheel if there is cracking, scoring, metal pick-up, or wear. Report certain information to the FAA within 10 days.
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Compliance Time
Before further flight and at intervals not to exceed 25 hours time-in-service.
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Affected Aircraft
Airbus Helicopters Model EC120B helicopters with an Air Comm Corporation air conditioning system installed in accordance with STC No. SR00491DE, where the compressor is driven by a pulley installed aft of the rotor brake.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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