Quote:

I think one reason more people haven't posted this problem is most people probably start the APU and start engines and fly. But some of us spend quite a bit more time on the ground on APU power, enough time for the electrical problem to appear.

True.
OR. They could do what I do. I use the Ground (External) Power, until just before pushback, then I start the APU, then pushback and start the engines during the pushback.


Quote:

Mark, I wonder if the results would be the same if you set the power selector from ground power to APU, and from Batt to STBY.

Why would I do that? I am not using Standby Power. I'm using the APU to provide power.

Have you tried the settings, the way mine are, to see if that gives you more than 11 minutes of power?

Besides, even if that is the case, it does not explain why my power failed that one time when I was using the battery for power only. If I use battery power ONLY now, I still get power for more than two hours. :-?