Between 1933 and 1936, de la Cierva used one C.30A (G-ACWF) to test his last contribution to autogyro development before his death in the crash of a KLM Douglas DC-2 airliner at Croydon Airfield in England on 9 December 1936.
At least one Royal Air Force (RAF) C.30A was on floats as a Sea Rota in January 1935 [REF].