My father was an Air Bomber with 158 squadron and on the 30 Dec 1942 he was a Flight Sergeant. He got the following promotions:
31.12.42 Pilot Officer on probation/General Duties, Bomber Command
(16.3.43 London Gazette [?])
30.6.43 Flying Officer on probation (23.7.43 London Gazette)
26.1.44 Flight Lieutenant, Acting
31.12.44 Flight Lieutenant (W) (19.1.45 London Gazette)
From February 1943 he was off flying crew, went on courses and was an instructor until the end of the war when he became flying crew again.