Originally Posted by
Romasik
Well, I’ve heard from maintenance, that their procedure was to start the APU 3 min after Master Switch pressed ON (Airbus). I’m not sure what is the technicality behind that. So I started delaying APU start after landing and since then never had an APU FAULT and second attempt.
Airbus (320) FCOM states “Wait at least 3 s before selecting APU START pb-sw.” and as stated by someone else here that’s probably just for the ECB to perform it’s power-up test before crew initiates the start sequence. Never heard or read about 3 min.
CP