kai491 wrote on Oct 6^th, 2023 at 11:05am:

Although this will work fine. Another Workaround is to simply add the AvionicsSwitch=True to the Apron.FLT file and save it. All radios and transponder screens show as working :) Not tested on a flight however!

Nevermind, still had to use Ctrl E to get the engines started.
I'll keep digging
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When I set AvionicsSwitch=True the frequencies are displayed but they can only be modified for Comm 1 and they only swap from standby to active in Comm 1.