- the applicable REFUEL VALVES selector switch when set to SHUT in a manual refuel.
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201-299, 401-499, Aug 01/05 CES The refuel valve will close automatically:
- if the pressure of the fuel is reduced to less than 50psi (3.45bar)
- the refuel supply is shut-off.
A fuel spill can be caused when a fuel tank (one or more) becomes full and the fuel flow, refuel or transfer (in), is not stopped. The continuing fuel overflow will then start to go out through the applicable tank(s) vent system. A refuel overflow from the center tank will normally flow to (both) the left and right sides. The escape routing of the center tank overflow fuel is through the center tank:
- vent pipe to the left wing surge tank.
- pressure relief vale to the right wing tank. If you do not correct the (original) cause of the malfunction the end result will be for fuel to be discharged overboard, from a NACA vent, when the applicable surge tank (temporary reservoir) becomes full. A jet pump scavenge system, powered by fuel pressure supplied by the related wing tank fuel pumps, is used to transfer fuel from the surge tank to the wing tank outer cell. When the intercell transfer valves are closed and the fuel level in the outer cell reaches the level of the spill pipe, gravity will cause the fuel to flow through the spill pipe into the wing tank inner cell.
A transfer valve is installed between the engine fuel feed line and the refuel gallery. When open this lets the fuel pumps:
- transfer fuel from one tank to another
- defuel the aircraft through the refuel coupling.
**ON A/C 301-399,
A. General (synopsis of refuel system description and operation)
There are four different types of refuel procedures, these are as follows:
- Automatic Pressure
- Manual Pressure (with electric power)
- Manual Pressure (without electric power)
- Manual Overwing, (gravity and without electric power).
Refueling is usually automatic, the required fuel load is set on the preselector at the refuel panel (800VU).
A fuel gallery connects the refuel coupling to the refuel valve of each tank. The refuel valves are used to control the fuel flow into the tanks in three types of refuel (procedures) and are as follows:
- Automatic Pressure
- Manual Pressure (with electric power)
- Manual Pressure (without electric power).
The fuel flow in the Overwing method is controlled by the delivery system (fuel tanker or pump unit).
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During an automatic refuel, when all the refuel valve control switches are set to NORMAL, the Fuel Quantity Indicating Computer (FQIC) controls the refuel valves. Each refuel valve is closed when the actual fuel load for its related tank equals an amount, computed by the FQIC, that is related to the preselected fuel quantity. Fuel is supplied to all tanks at the same time. This is to keep the refuel time to a minimum. The fuel is loaded in the order that follows: Left and right wing tanks. Center tank (if the preselected fuel load is more than the two wing tank capacities).
During a Manual Pressure Refuel each refuel valve is closed, by one of the ground (refuel) crew, when its refuel valve control switch is set to SHUT.
During the automatic and manual pressure refuel procedures the Fuel Level Sensing System (FLSS) high level channels prevent an overfill and possible spillage.
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