Key Point?
Examination of the MGB indicates that there was no loss of main rotor drive and that the main rotor blades were rotating at the time of the impact. The examination of the MGB also revealed that the tail rotor drive gears had been severely damaged, resulting in a loss of drive, causing it to stop producing thrust. Further examination is being carried out by the TSB Engineering Laboratory to determine the cause and sequence of this loss of tail rotor drive.