Hi Catch, Sids test was on the ground where the tank is probably level so both pumps are equally sat in fuel, in flight the fuel will move forwards or aft depending on aircraft attitude.
This whole business of the main tank fuel still transferring after the Xfer pumps are switched off is mind blowing, can't wait to find out the official reason for this, also why two aircraft that Were tested would drain the main to completely different levels with pumps off, stinks of a qty indication system fault.
I'm still thinking the Xfer pumps were manipulated as required during the second mission, then whilst in cruise back towards Glasgow the Aft pump (which was used during hovering) was switched off and the fwd not turned on. This could be the case for three reasons a) CAD failure, b) maybe the main was showing zero or c) pilot error (doesn't figure though as he would have cautions showing unless CAD fail)
CAD fail could also account for the Primes being switched on as a reaction to the Red Fuel Low, if a CAD fail is not discovered by the AAIB then I don't believe the true answers will ever be found.
FS