Yes, airborne with MAIN PWR switch in the off position some stuff keeps working. On ground this switch position additionally disables the standby generator and disconnects the battery from the battery bus which airborne doesn’t do. And so despite selecting MAIN PWR off after the crash the airborne state prevented the battery bus from being disconnected and therefore the COM1 radio continued to function.
that could Indeed be it. If airborne State is determined by weight on wheels, And I landed without wheels,
It makes sense.