EASA 2020-0048

Supersedes but retains the requirements of EASA AD 2019-0193, which mandates inspections and checks of the tail rotor duplex bearing and, depending on findings, applicable corrective action, as well as a revised reporting regime, including the reporting of HUMS data for helicopters equipped with a HUMS retro-mod. Updated AD requires installation on an improved tail rotor servo-actuator with a control rod and related castellated nut on the back-end side with a left-hand thread. Prompted by an accident of AW169 helicopter that lost yaw control on takeoff at low forward speed and a subsequent Leonardo service bulletin with instructions to check for the correct installation of the tail rotor servo-actuator in AW169s and AW189s.