Hello,
I don't understand your first question. Before reaching O.T.U., each airman had been taught in his own trade, and received his flying brevet. But this training was done on trainer aircraft such as the Airspeed Oxford, for the pilots, and other types used as flying classrooms, to learn navigation, bomb aiming, wireless training, air gunner training...
In O.T.U., the airmen "crewed up", i.e. making a crew together, usually of 5 comprising a pilot, a navigator, a bomb aimer, a wireless operator and an air gunner. This was for example the standard crew of a Wellington. From then on, they were flying as a crew, sometimes with an instructor, otherwise on their own. The aircraft was larger and more complex than what they had been using before, so it was a step forward.
I'm not sure about the duration of a course, I'd say between 2 and 3 months, but I've seen longer periods, probably due to the weather.
Next step was directly to a Squadron, in the beginning of WW2, then to (Heavy) Conversion Units when these were created. It was in HCU that a flight engineer and the second air gunner joined the crew, training being done on four engine bombers.
The Operations Record Book of No. 23 O.T.U. in Pershore can be found in AIR 29/667 and 668 at The National Archives in Kew.
HTH
Joss
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