Squadron leader Squadron leader Squadron leader (Sqn Ldr in the RAF ; SQNLDR in the RAAF and RNZAF; formerly sometimes S/L in all services) is a commissioned rank in the Royal Air Force and the air forces of many countries which have historical British influence. It is also sometimes used as the English translation of an equivalent rank in countries which have a non-English air force-specific rank structure. An air force squadron leader ranks above flight lieutenant and immediately below wing commander and it is the most junior of the senior officer ranks. The air force rank of squadron leader has a
University of Birmingham Air Squadron University of Birmingham Air Squadron The University of Birmingham Air Squadron, commonly known as UBAS, is a squadron within the Royal Air Force established in 1942. It is based at RAF Cosford, Shropshire, and flies a fleet of five Grob Tutors. In 2009 the squadron upgraded the aircraft to the Grob Tutor EA which has an advanced avionics suite. The Squadron has four Flights, A, B, C and D; each with a student Flight Commander who holds the rank of Acting Pilot Officer. UBAS is also the parent squadron of 8 Air Experience Flight, who jointly fly UBAS' Tutor fleet.