The thing is, if I already know what's going to be faulty while being on the ground, what's the point in starting that mission? For example: The oil pump is failed when the mission loads. So I'm going through the checklist very carefully already knowing I won't be able to startup and fly the aircraft, or fly it only for ten minutes, because I know I just started the mission where exactly this will happen. In my opinion, bad things should happen by chance, with me as the pilot not knowing beforehand what exactly will happen.