Hello,

 

for a few weeks I notice that during the preflight (about 5 minutes before pushback) somebody just disconnects the Ground Power and I'm sitting there with no power, emegency exit lights on and this weird alarm. Does anybody know why this happens and how to avoid this?

 

Best regards

Roman

You're normally getting asked if the APU should be started? Mostly after you've done the departure briefing (around +10) or after the load sheet arrived. The GPU is disconnected automatically. Like the cargo doors automatically close with 3 minutes left until pushback.

 

If not (for what ever reason), just turn the APU on manually and put it on the busses. Then the APU is keeping the plane powered even if the Ground Power is disconnected.

Make sure the APU is on the busses.

 

You probably have the APU running, but not on the busses.

In Button mode you should start the APU by yourself according to manual. May be that is the case?