sentences:  Accident investigators cited the Hermes captain's failure to maintain effective radio communications with the tower during the final stage of the radar-assisted approach and his decision to continue with a visual approach under conditions that did not allow him to positively identify the correct runway as the probable cause of this runway collision.A major contract was secured in September 1952 when Airwork was selected by the Royal Navy to operate the Fleet Requirements Unit (FRU) at Hurn Airport, near Bournemouth.The FRU employed civilian pilots using Fleet Air Arm aircraft to provide target aircraft for the training of Royal Navy radar operators.