I've recently started flying the J41 again and did the tutorial flight to get back into things which went smoothly.
I have made my own flows based on the tutorial but after I have started the engines and turned the avionics switches back on, the FMC remains off. When I turn it on, the route I have entered AND the cruise altitude figure entered on the VNAV Data page have disappeared. I can't work out what i'm doing wrong to cause this to happen?
I am loading the tutorial saved flight and then re positioning the aircraft so that it is in a cold and dark state - is that something to do with it maybe?