bus_power(fgGetNode("/systems/electrical/outputs/navcom[0]", true)),
power_btn(fgGetNode("/radios/marker-beacon/power-btn", true)),
audio_btn(fgGetNode("/radios/marker-beacon/audio-btn", true)),
bus_power(fgGetNode("/systems/electrical/outputs/navcom[0]", true)),
power_btn(fgGetNode("/radios/marker-beacon/power-btn", true)),
audio_btn(fgGetNode("/radios/marker-beacon/audio-btn", true)),