just to clarify whether all 3x modes of flap operation is simulated.

 

PRIMARY: flap handle selection = hydraulic drive.

SECONDARY: flap handle selection = elec drive after system fault is detected & associated SLATS PRIMARY FAIL &/or FLAPS PRIMARY FAIL eicas message/s show.

ALTERNATE: flap is manually operated electrically using ALTN FLAP controls on the pedestal (co pilot side).

 

it seems only PRIMARY & ALTERNATE modes are simulated....

 

 

Secondary is simulate also you can try it by shutoff all center hydraulic pumps and move the flap lever in flight. But if you do on ground make sure both engine are running.

kool. will try it with engs running, it was on ground pwr'd on APU gen when i last tried. the (real) 744 secondary mode is live even on ground power, i guess different airplane so not the same even though similar design philosophy...