Originally Posted by
FlyingStone
Even on the basic 737 without the fuel preselect, we're really talking about 3 ON-OFF switches, one for each fuel tank. Figure out how much you need in each tank, open the required valves, close each valve 20-30kg below the desired tank quantity.
Hardly a difficult task compared to what is required to actually fly the airplane.
I don't think it has anything to do with difficulty.
It can be time consuming, especially on older aircraft. Pilots tend to be quite busy doing preflight tasks, drinking coffee, not getting wet.... 😁