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By March 1919, Avro sent the first prototype to Aeroplane and Armament Experimental Establishment at Martlesham Heath for official trials before its eventual return to the Avro factory at Hamble.
After modifications to the radiator layout and wing structure and re-armed with three Lewis guns in an Eeman mounting capable of firing up at a 45° angle in order able to engage enemy bombers from below, and numbered B1484, the FB.26 was passed to Aeroplane and Armament Experimental Establishment at Martlesham Heath for evaluation.