His first flying experience was in 1907 in a balloon race in Berlin, and in December 1908 he flew with
Wilbur Wright in
Le Mans. In February 1911, he offered to let both the
Admiralty and
War Office use the aircraft and airfield at Eastchurch to teach naval and military personnel to fly heavier-than-air machines. just off the coast at
Eastbourne. In August 1912, he flew a floatplane between the upper and lower parts of
Tower Bridge and underneath
London Bridge. In 1914, he made a flight following the course of the
Nile between
Alexandria and
Khartoum in a specially built four-seater aircraft, the
Short S.80 The Nile. Beset by mechanical problems, the flight took from 2 January until 22 March. Upon the outbreak of the
First World War in August he was commissioned in the
Royal Naval Air Service and carried out patrols in the
English Channel before becoming chief instructor at Eastchurch. He transferred to the
Royal Air Force when it was formed in 1918 but resigned his commission in 1919. McLean was a founder member of the Aero Club of Great Britain (later the
Royal Aero Club) and was Chairman in 1923–1924 and again from 1941 to 1944. McClean served as
High Sheriff of Oxfordshire for 1932/33. ==Family and later life==