I see what you mean. Another thing that I do is to load the 727 Cold-n-Dark, then move it to the airport of my choice and save it there. I think that because it was just a change of location, the 727 was set correctly for the Cold-n-Dark situation. It sounds like that is definitely the difference. The only thing it doesn't explain is, why, when I do start mine from the C172 default flight situation, the avionics still don't cut out after 15 minutes or so. It's really weird.

Mark

I have a good one for you! Because I am in the middle of a flight, I opened my default C172 saved flight to see if the Alternator is on (I really don't think it is) and what I found at the bottom of the file surprised me. Here is some what I found:

[CaptainSim]
WiperPos=0
iSndPl=0
SetFuelTanks=1
FuelSelTank1=10
FuelSelTank2=10
FuelSelTank3=11
FuelSelTank4=10
L01_001_SW2=0
L01_002_SW2=0
L01_003_GL3=2
L01_005_SW2=0
L02_001_BUT=0
L02_002_BUT=0
L02_003_BUT=0
L02_004_BUT=0
L02_005_BUT=0
L02_006_BUT=0
L02_007_BUT=0
L02_008_BUT=0
L02_009_GL3=0
L02_010_LT=0

It goes on for quite a few pages! I have no idea how that got in there. I know never put it in there myself. But that could make a difference.

So what I will do is backup the file, remove the [CaptainSim] information, save it and try a flight using the 727 with the fixed up C172.FLT and let you know how that goes.

Mark

EDIT Feb 19^th, 2011 at 4:02pm: I loaded my default C172 Flight and the Alternator is definitely OFF. I had made the changes to it, as mentioned above, and took the 727 up for a flight. I never lost the Avionics power nor radio communications. The only thing different, was the Pilot and F/O windows opened when I first loaded the 727.

Jimi said:  also i noticed that a lot of 727 captains start no 2 engine first thus essential power and ac meter selector in the gen 2 mode after no 2 engine started.

I don't know why anyone would start the number two engine first? That's not to say it cannot be done, but why? The only reason I can think of is you are still loading passengers from mobile stairs and you don't want the noise of engine one in their ears, and maybe the ground crew could still be loading bags and your APU is inop and the ground crew wants to remove ground power and start air - that's a lot of if's. In any event you would not like to fly around with the Essential bus being powered by the number two generator because if you lose the number two engine or generator, or there is an electrical fault or short on the number two bus you could loose all your instruments and radios.  

Normal start sequence on the 727 is 1, 2 & 3 but there is no reason you could not start them in any other order. There is a reason however to set the electrical panel with the essential bus powered by generator three, and that is to keep essential powered by something other than generator two, and to spread the electrical load more evenly since bus three has fewer loads.

Lou