EASA 2023-0105

Requires replacement with serviceable parts and provides additional requirements for installation of the tail rotor duplex bearing housing and slider group assembly.  This AD stems from reports of loosening of the tail rotor duplex bearing locking nut. Relevant investigations identified incorrect accomplishment of assembly and continued maintenance instructions of the tail rotor duplex bearing housing and slider group as the most likely root cause of the reported events. This condition could lead to failure of the tail rotor function, possibly resulting in loss of control of the helicopter.