and these are they functional what do they do? [image] [image]

@Garack666 These switches are non functional because you only need them in case of system malfcuntions which aren’t simulated in MSFS. e.g. AVIONICS BUS TIE SWITCH The AVIONICS BUS TIE switch connects the AVN BUS 1 and AVN BUS 2 together in the event of failure of either bus feeder circuit