EASA 2019-0193

Supercedes but retains the requirements of EASA AD 2019-0121R1, which requires in-depth inspections of the tail rotor duplex bearing for absence of particle release, as well as additional repetitive roughness checks of the tail rotor duplex bearing. New AD requires a revised reporting regime, including the reporting of health and usage monitoring system (HUMS) data for helicopters equipped with the retro-mod that relocates an existing HUMS accelerometer sensor to the tail rotor servo-actuator lever to allow monitoring of the vibration signature of the tail rotor duplex bearing.