Landing Gear:
Normal extension - electrically actuated, hydraulically powered.
All in all, in a totally dark aircraft I suspect the landing gear cannot be relied on.
WRONG WRONG WRONG WRONG....
744 Normal extension is mechanically activated, hydraulically powered. Mechanical cables run from the gear lever to the hydraulic selector valves in the wheel wells.
(Edit) Maybe you were thinking of the Lever Lock? This would be no impediment to retraction (just push the button) or extension (I believe the cam setup allows movement downwards without pushing the button)
Alternate extension requires Main Bus DC and AC power for control and power. Will
not operate without main busses online.
Rgds.
NSEU