Superseded. This AD was superseded by AD 2021-05-05. Verify which one applies to your serial and effectivity before any maintenance action.
AD 2016-23-05
Effective 12/12/2016 · Published 11/25/2016
Airworthiness Directives; Airbus Helicopters (Previously Eurocopter France) Helicopters
Summary
We are superseding Airworthiness Directive (AD) 2007-25-08 for Eurocopter France (now Airbus Helicopters) Model SA-365N1, AS-365N2, AS 365 N3, SA-366G1, EC 155B, and EC155B1 helicopters. AD 2007-25-08 required checking the tail rotor gearbox (TGB) oil, inspecting the magnetic plug, and either replacing the TGB or performing additional inspections. This AD was prompted by reports of new occurrences of loss of yaw con…