The configuration of the auxiliary gearbox that I have typically seen on FB.31s – in tech pubs and historical photographs (no opportunity yet to see any in the flesh) – includes mounting of the generator. Early and later configurations are shown below in extracts from AAP.828:
Above: Early configuration with vacuum pump. Generator is shown.
Below: Later configuration with vacuum pump deleted. Generator is shown.
Below: Other configuration with vacuum pump. Generator is not in the usual position; instead a bracket with pressure relief valve is attached at the location. The wreckage shown is from Vampire Mk.31 A79-536 which crashed at Pearce on 18th September, 1955.
Vampire F.30 A79-14 at the Camden Museum of Aviation has a similar gearbox that is partially installed – the gearbox has the bracket with pressure relief valve, and no sign of any generator!
So, what I want to know is:- WHERE IS THE GENERATOR on aircraft of this mod status?!