Doppler Data.
1 If power is off an aircraft on the ground does the aircraft ACARS ping when power is turned on or does it wait until INMARSAT interrogates it?
2 I'm not familiar with the T7, but flew the 763. Does the apu autostart if there is a complete loss of electrical power on the busses.
3What's the location of the fuel feed for the APU in relation to the Engine feed. Is it likely that that APU would find fuel other than in the fuel line if the engine feeding from that tank shuts down due to fuel starvation.
4 If there is a total AC electrical failure the aircraft will have battery power. What bus is the ACARS receiver powered from? In other words when a 777 is on 30mins (?) of battery power is the ACARS still functioning in its basic mode?