Post by LOU on Aug 6th, 2011 at 2:43am
First I'll talk about the fuel system in the 727...
When the 3 tanks are equal, you burn the fuel - TANK to ENGINE
In the above picture, the three tanks are about equal. The number 2 cross feed is open to maintain fuel pressure in the cross feed manifold. Tanks 1 & 3 cross feeds are closed to prevent any movement of fuel. ALL fuel boost pumps are ON.
When there is more fuel in tank 2 than in tanks 1 & 3 you cross feed the fuel as follows....
You are burning the fuel from the center tank through the cross feed manifold by opening ALL cross feeds, and turning off the boost pumps in tank 1 & 3. The panel is pretty simple, just look at the white lines and follow the flow.
I go over the electric system later. This is a more complex system and needs some hand holding.
I'll explain the names of the various breakers and switches and how they work.
Lou
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When the 3 tanks are equal, you burn the fuel - TANK to ENGINE
In the above picture, the three tanks are about equal. The number 2 cross feed is open to maintain fuel pressure in the cross feed manifold. Tanks 1 & 3 cross feeds are closed to prevent any movement of fuel. ALL fuel boost pumps are ON.
When there is more fuel in tank 2 than in tanks 1 & 3 you cross feed the fuel as follows....
You are burning the fuel from the center tank through the cross feed manifold by opening ALL cross feeds, and turning off the boost pumps in tank 1 & 3. The panel is pretty simple, just look at the white lines and follow the flow.
I go over the electric system later. This is a more complex system and needs some hand holding.
I'll explain the names of the various breakers and switches and how they work.
Lou
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