Transport Canada CF-2024-03

This emergency AD mandates an initial inspection, instructions for the replacement of the vertical stabilizer top-end cap if required, and a recurring inspection of the top-end cap for cracks. There have been multiple occurrences of the vertical stabilizer top-end cap assembly being found cracked, with some cases including the departure of the NAV/VOR/GS antenna and tuning weight from the helicopter during flight. Detailed investigation has identified that the stabilizer top-end cap assembly was not designed for the full fatigue spectrum. The investigation has determined that if no corrective actions are implemented, there is potential for the antenna and tuning weight to depart, which could damage the tail rotor, resulting in the loss of directional control of the helicopter. The corrective actions are interim actions until a permanent solution can be made available for the fleet.