hope this helps
__classic____
CLEARED FOR START
DOORS .... CLOSED
FlLT DECK WINDOWS.... LOCKED
AIR CONDITIONING PACKS ...OFF
START PRESSURE........_________-psi
ANTICOLLISION LIGHT .....ON
__ NG ___
The start pressure line is missing
This is because the bleed pressure from the classic APU is fixed and NG is as per demand so if you looked up at the NG pressure guage prior to start it would be close to zero .Only after the starter is engaged does the pressure build up.
I think there is a seperate compressor in the NG APU that does the trick.
Why don't you check with the engineering they might be more precise.
