The son of Francis G. and Jessie M. MacAndrew, 2nd Lieutenant Colin Glen Orr MacAndrew, 2/1st Ayrshire Yeomanry, received Royal Aero Club Aviator's Certificate 4205 on a Maurice Farman biplane at Military School, Thetford on 21 December 1916. He was appointed Flying Officer and seconded to the Royal Flying Corps on 16 April 1917. On 1 July 1917, he was promoted to Lieutenant. A Bristol Figher pilot with 11 Squadron, he scored five victories in the summer of 1917. He was appointed Flight Commander and promoted to temporary Captain on 12 September 1917.
Great Britain, Royal Aero Club Aviators' Certificates, 1910-1950
British Army WWI Medal Rolls Index Cards, 1914-1920