AMERICAN AIRCRAFT IN ROYAL AIR FORCE SERVICE 1939-1945: CONSOLIDATED MODEL 32 LIBERATOR. (CH 18035) Liberator GR Mark IIIs, FK228 ?M? and FL933 ?O?, of No. 120 Squadron RAF, lined up with other aircraft at Aldergrove, County Antrim. The third aircraft in line is a GR Mark V, FL952, of No. 86 Squadron RAF. The Mark IIIs are equipped with ASV Mark II anti-submarine radar, while FL952 carries centrimetric ASV radar in a radome under the nose.