One of these days - no APU. GPU is connected via EXT POWER A. Following the recommended procedure starting ENG 1 first, then during pushback crossbleed ENG 2. As external power removed the entertainment system goes to reset for 15 minutes along with safety demonstration. WHF
Next flight tried EXT POWER B - the same sh.t.
Haven't tried ENG 2 first or both engines before external power removal.
Something is wrong here. Recommended procedure and chaos with safety demonstration. Any idea, why and what to do?