|No. 109 Squadron RAF|
|Branch||Royal Air Force|
The squadron first formed on 1 November 1917 as 109 Squadron Royal Flying Corps at South Carlton in 1917 operating the de Havilland DH.9 until it was disbanded on 19 August 1918.
Reformed on 10 December 1940 from the Wireless Intelligence Development Unit at RAF Boscombe Down operating a variety of aircraft. The main task was to identify German radio beams and to develop methods to jam them, its secondary role was to develop wireless and radar navigation aids for Bomber Command. In 1942 the squadron moved to RAF Tempsford with the twin-engined Mosquito light bomber fitted with Oboe and operated as part of the Pathfinder Force. The first raid it led as a marker squadron was on Düsseldorf on 1 January 1943. and was fully involved with raids including the last raid on Berlin on 21 April 1945. As the war finished it used its accurate navigation equipment to help drop supplies in the Netherlands. The squadron was disbanded on 30 September 1945 at RAF Little Staughton it had carried out 5,421 operational sorties with the Mosquito with the loss of 18 aircraft.
On 1 October 1945 it was reformed at RAF Woodhall Spa still as a Mosquito unit and provided a light bomber force for Bomber Commander in the post-war years. It eventually re-equipped with Canberras and saw action in the Suez campaign. With the increase of the V bomber force the squadron was no longer needed and was finally disbanded on 1 February 1957 at RAF Binbrook.
|1917-1918||de Havilland DH.9||Single-engined piston biplane bomber|
|1940-1941||Armstrong Whitworth Whitley||V||Twin-engined medium bomber|
|1940-1942||Avro Anson||I||Twin-engined transport and trainer|
|1940-1942||Vickers Wellington||I||Twin-engined medium bomber|
|1942||Avro Lancaster||I||Four-engined heavy bomber|
|1942-1945||de Havilland Mosquito||IV, IX and XVI||Twin-engined light bomber|
|1945-1948||de Havilland Mosquito||XVI|
|1948-1952||de Havilland Mosquito||B35|
|1952-1954||English Electric Canberra||B2||Twin-engined jet light bomber|
|1954-1957||English Electric Canberra||B6|
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