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MSFS 2020 APU issue

dl4saw · 2025-11-29T18:29:34Z

I am using PM CDU/MP/GC without PM-Systems. It worked well with FS2004 and the PM-B737 model, I could control the aircraft using the default FSUIPC variables. Now, I updating to MSFS-2020 with all new PM-software and model. I have problems to start the APU. The PM-B737 aircraft model might use some PM-variables, even if no PMsystems is used. If I start the APU (0B58), the APU starts, but stops immediatelly. All other prerequisits (Battery, Bleed etc,) are available. Strange: after starting and stopping the engines with Ctr.+E, I can start the APU and it remains running. The same behaviour with the default 787, but only if the main battery switch is off. Is there a "hidden" or not dokumented battery switch? Any idea?

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Posts: 216

FSUIPC Support

Moderator

December 1, 2025 7:37 pm

(@fsuipc-support)

Joined: 4 months ago

Posted by: @dl4saw
↑
I’m still a bit bit overwhelmed by he the new features. I started working on my simulator over 20 years ago.. I am retired software developer, so I think I’ll manage.

Yes, everything is a lot more complicated in MSFS2020/2024. There are many more control methods, and every aircraft seems to use different methods and many don't respect the standard FS events or update/use the defined simvars. It takes a while to learn the ropes, but you should certainly be able to manage...!

Posted by: @dl4saw
↑
Regarding the ELECTRIC_PUSH_BATTERY: it appears under Developer->Behavior, when I press Ctrl+G and the main battery switch. (ASOBO-B787)

Ok, its probably a (n internal) b-var or maybe a hvar (html variable). I'll take a look tomorrow, but, as I said, just use the provided input event for the battery.

Nice looking set-up you have there!

Regards,

John

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