I believe that 75 - 80% of those
invited to OASC as prospective WSOps are
not selected, so 20 - 25% pass.
Of those that
are selected about 50 - 66% pass A Sqn at OACTU and start WSOp Flying training.
So of the total asked to attend OASC somewhere between 10 - 17% get as far as Acting Sergeant Trainee Aircrew...
And then me and my mates chop 'em
Seriously we do our best for the guys at this stage but one or two a year don't make the grade...so the total number of OASC attendees who get a Flying Brevet is probably around 12-15% on average.