L-1011 Trainer Installation: Fuel Used Instrument Power-Up - 400Hz Power System

Here is a video of the first set of instruments powered from the 400Hz distribution system in the Lockheed L-1011 simulator at the National Museum of Commercial Aviation. You can find a lot more detail on the Fuel Used instruments as part of the Fuel Consumed Indicator blog posting. Providing these first three instruments with the 115V 400Hz power from the AC Bus 1 Ext, AC Bus 2 Ext and AC Bus 3 Ext subsystems checks the 400Hz system end to end:

Below is a more detailed description of the Fuel Flow system on the L-1011. 

L-1011 Engine Fuel Used System - From Delta Pilot's Reference