[1] On 11 April 1918 he was flying a Royal Aircraft Factory R.E.8 two-seat biplane on a artillery observation patrol.
Over Bouzincourt he was attacked by four German fighters, the elevator controls were damaged by gun fire and Hart attempted to recover the aircraft.
[1] Hart rejoined the Royal Air Force in 1926 and from 1936 he worked at RAF Bawdsey on the first experimental radar station.
[1] In 1944 Hart became Chief Air Signals Officer at Supreme Headquarters Allied Expeditionary Force whener he was involved in the planning for the D-Day landings.
Hart died on 16 July 1960 at his home at Aston Rowant in Oxfordshire, he was electrocuted while connecting power to an electric lawn mower, he was aged 61.