Originally Posted by
Skypilotsv1984
Flying with the old timers, you’ll learn that you have to have the APU master on for a while and the door open indication on to allow the ECU to warm up and conduct a proper start. It’s something they brought with them from the -9.
Which is a total ol’ wifes tale.
Looka here young feller, dem newfangled APU’s got demselves a little sumthing called software and that lil piece o’magic runs a self test and start.