I am totally absorbed by this great model of the 737NG. Everything about it is wonderful. The only issue I have is getting the APU on line. I have years in the PMDG and IFly NGs and never had an issue starting the APU. Just left aft fuel pump on, hold the switch in the start position a couple of seconds, release and directly the EGT starts increasing, low oil pressure light comes on and in a minute you have the APU GENs available. With Zibo it just doesn't happen. Sometimes nothing, other times the EGT comes up but no APU GENS come on. Other times nothing and if I flip the APU switch off and on two or three times the EGT temp jumps up and the generator available light comes on. Very erratic behavior. I've surfed the many discussion on this topic and it seems to be a problem for some but not others so I don't know if it is procedural or just a bug in this other wise excellent aircraft. I just redownloaded the latest Zibo version (4.05.33) yesterday and today I had to hook up the GPU and air cart to start the engines at the gate. The proper EGT displayed but I couldn't get the APU generators to come on. Yes I have the battery and stand by switches on and even GPU hooked up.

I would appreciate hearing advice or thoughts from other users of the Zibo and Level Up 737NGs on this issue. I've already been to the Zibo forum on .org.

Maybe try 4.05.34, the latest from Zibo.

https://drive.google.com/file/d/1MTuKxc1iAzzk7FabPyLQMTtWpSMIhBJg/view?usp=drive_link

10 hours ago, Mike_CFII_MEL said:

Maybe try 4.05.34, the latest from Zibo.

https://drive.google.com/file/d/1MTuKxc1iAzzk7FabPyLQMTtWpSMIhBJg/view?usp=drive_link

Thank you, I will.

You didn't mention turning the APU bleed on, so you could try that.