Yes, engine off. Simple enough. 'Must turn engine off to change or reload ordinance.'
glad you understand that concept.
i have an idea about the fuel...a compromise maybe...if fuel load out is to be changed from original take off value (not including drop tank), it should take at least an additional 60 seconds for the loadout to be completed.
the reason being, ole goober originally took off with 75% fuel, did his thing and is out of ammo but he still has 50-60% fuel load and now the base he is rearming at is suddenly getting attacked, now he wants to change his fuel load to 25% fuel so he can feel good about himself thinking he now has a better chance to fight the vulchers.
to make the change in his fuel load, the fuel in his plane has to be siphoned and siphoning fuel takes longer than adding fuel...
in the case where goober is rearming and was out of fuel and wants to now change his take off fuel load, same thing...filling up takes time and the base supply officer is pissy about fuel allocations being correct.