Airworthiness Directives; Airbus Helicopters

FAA / Federal Register · 2020-17271

The FAA proposes to adopt a new airworthiness directive (AD) for Airbus Helicopters Model AS-365N2, AS 365 N3, SA-365N, SA-365N1 helicopters. This proposed AD would require replacing the main gearbox (MGB), or as an alternative, replacing the epicyclic reduction gear module for certain serial numbered planet gear assemblies installed on the MGB. This proposed AD would also require inspecting the MGB magnetic plugs and oil filter for particles. Depending on the outcome of the inspections, this proposed AD would require further inspections, and replacing certain parts. This proposed AD is prompted by the failure of an MGB second stage planet gear. The actions of this proposed AD are intended to correct an unsafe condition on these helicopters.