Originally Posted by junior man
Very unlikely the APU was running as at the weights and temp involved still would not have been needed for TO performance.
RAT would have deployed if you lost both engines, giving you Electrics, Normal Law and flight controls. Poss hydraulic power still available for flaps with engines turning even if not producing power.
How would APU improve takeoff performance?
With two hydraulic systems lost (green and yellow, RAT powering the blue system) and in emergency elec configuration the aircraft certainly wasn't in normal law.