I also have this problem as just as previously explained.

Jeff

Captain Sim wrote on Apr 25^th, 2012 at 6:54pm:


I have seen this issue discussed for many weeks. People losing elec power after 5 minutes with APU running. Some things still will work - lights, many gauges - but radios go silent and HSI loses power. APU still running, voltage/amps look normal, but no radios, HSI.

Captain Sim wrote on Apr 25^th, 2012 at 6:54pm:


There is discussed the 1.0 In fact

Сhecked WITHOUT using fsx menu or pausing a flight. All the same.

I tried it. Powered by the EP, after 5 minutes, as expected, power was lost. Engine will not start (air from the ground), dome light is not lit. But the panel are lit. Started APU, APU generator to connect - all died out. Absolutely.

The following image is of my OH Panel after using the APU, continuously, for 47 minutes.


I started the APU at 17:39 and this image is at 18:26.

I also tried with the EP/BA, and everything was working fine 30 minutes later.

I'm trying very hard, but I still can't make it do it again.

Mark

Quote:
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:
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.

bud7h7 wrote on Apr 27^th, 2012 at 12:36am:

I think we need to set everything in the 737 the same. Same model, livery and the same settings (lights, switches and knobs).

That way we are dealing with the same set of rules for e problem.

Mark

Even with electric_always_available = 1 in the .cfg, I'm losing power to radios after about 6 minutes, with APU running. Also when this happens the radio frequencies won't dial, and engines won't start. Amps/volts still look okay, and everything appears to be on but if I shut off the APU generators I can see the Battery is dead.

My APU start precedure:

battery on
hydr B pumps off
DC selector to Batt
Iso valve to auto
#1 fuel pump on
APU start, stabilized
APU gen switches on ***see note below***
apu bleed open
AC selector to APU
position lights on
#1 pack on after 1 minute

I notice when I switch ONE apu generator switch to ON, both "bus off" lights extinguish, instead of only the one relative to each generator switch. Not sure how important that is or not.

Thanks for doing that Mark. I also thought maybe my saved default flight was causing problems with this aircraft.

I have tried saving with the C172 running, as well as cold/dark in the following config:

C172
completely shut down
avionics on
magnetos - I tried "off" and "both"
alternator - tried off and on
brake set

And I tried deleting my default flight to see if that would help.

But I'm also having the 737 issues even if I load the CS cold/dark saved flight. Fortunately the infinite battery option in FSUIPC is an effective workaround even thought the "always_on" entry in the .cfg didn't help me.