Well... It's a computer that controls the DC part of the plane.
@ Amadis of Gaul: Well, I don't want the overall picture, when you see F-COM with the transfer valves in the CTR TANK.... And when you see all these valves, I still want to know how they are controlled, for e.g: The HP fuel pump of the HMU is on the acessory gear box connected to the turbine... but in the tanks, the pumps are electrically powered! Do you remember, we had talked about the CTR TANKS? I hadn't understood how it had priority on Inner tanks! I had to understand the engine feed stuff with the sequence valves. Now , I think: how are the sequence valves controlled? Electrically? (switches, servomotors....)
