Hello again  

1.) i've got the apu problem, when i started the apu
everything looks normally but seem like 1 part between
apu just start > light goes on, it jump to started so quickly
(in C-130 fs9 took around 5-10 second before light goes on)

2.) in AP panel, which key that command 'NAV' button?
i tried MSFS key command for NAV button but it can't active this button.

Please advice, Thank you.
Prechapoj

On the AP panel itself, NAV is selected with the TRACK switch. I only use the AP popup panel so don't know if any of the keyboard commands work or not.
You really should read the manual on the use of the autopilot as it is a little bit more involved than the default autopilots in FSX. And I still struggle to get the AP to work sometimes.
But to help you along...
1. Turn on Power switch
2. Make sure 'A, R, E' switches are on (up) (mine are alway off for some reason?)
3. If you turn on Engage now, that will just hold your current Attitude, which can be adjust with the Bank and Pitch knobs.
4. Use the Nav Mode Select switch to select either Hdg, GPS, or VOR/ILS 1/2 (this assumes you've also set your heading bug, have a GPS flight plan running, or have a VOR dialed in)
5. Turn on Engage if you haven't already done so, then turn on the TRACK switch and the plane should start navigating properly. (keep those fingers crossed!!!)

Hey,

seems you got the answer before I had the time to check it in FSX.
Can't seem to find the command to get the AP in the track function however.

Tyrion

i think something wrong with model10 (C-130H Japan)
too much smoke, press I but still smoke  

so i removed my RTAF livery from model10,
Then everything fine. (used model9)