A320 APU Master Switch / Shutdown Issue (MSFS 2020 & 2024)

[Primo320]

Hello iniBuilds Support,

I’d like to report a potential issue with the A320 APU behavior in both Microsoft Flight Simulator 2020 and 2024. I’m not fully sure if it is consistently reproducible, but I’ve seen similar reports from other users experiencing the same behavior.

Configuration:

• MSFS 2020 and MSFS 2024
• All assistance options disabled
• No key bindings assigned to APU controls

What I observed:
Starting from Cold and Dark, the APU behaves normally until engine start. After engine start, the issue occurs.

Steps I followed:

1. Start Cold and Dark
2. Follow normal startup checklist
3. Turn ON APU Master Switch
4. Start APU and wait until it reaches 100%
5. Turn ON APU Bleed
6. Start both engines
7. Turn OFF APU Bleed
8. Turn OFF APU Master Switch

Issue:

• After turning OFF the APU Master Switch following engine start, the APU continues running for an extended period (~30 minutes or more).
• The APU Master Switch becomes unresponsive and cannot be turned back ON.
• The APU cannot be shut down using the Master Switch once this state occurs.
• It remains running until simulator restart or eventually times out.

Expected behavior:

• APU Master Switch should remain responsive at all times.
• APU should shut down normally when commanded OFF.

Since I’m not certain how consistently this can be reproduced, it may help to check if other users are seeing the same behavior under similar conditions.

Let me know if you need logs, a video, or further testing details.

Thanks for your time,
Primo320