Avionics Master Switch vs. Avionics Switch???
Im having a time trying to understand the difference between Master Battery, Avionics, and Master Avionics Switch.
My train of thought is that when the Battery Switch is ON, it supplies power to the aircraft's systems and when the Avionics Master Switch is ON, it enables the avionics to be turned on and also causes the Display Units to turn ON. However, the LJ45 handbook references having the L & R Avionics Master Switch Turned OFF for Battery starts, but if the Display Units are not showing data, then you are a bit in the dark as to the Engine Stats (oil pressure, fuel flow, etc) and these need to be monitored while starting.
Here's where Im thinking the difference lies between offset 2E80 (Master Avionics Switch) and 3103 (Avionics). One offset causes the DUs to come online and the other actually causes the NAVs and COMs be available? Perhaps when turing on the Master Batt it brings the DUs online, but the actual data is not shown till the Master Avionics switch is pressed.
Can someone shed some light here?
Thanks,