- the applicable REFUEL VALVES selector switch when set to SHUT in a manual refuel.
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 valve to the right wing tank
- main transfer system (28-26-00) to the left and right wing wing tanks (by gravity/pressure even when set to OFF).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 301-399, ∞∞28-25-00∞∞∞∞∞∞∞∞∞∞Page 253
Nov 01/04 CES 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. Two clack valves (non return valves) are at the bottom of the RIB22 and connect the surge tank to the related wing tank. In normal operation the clack valves:
- let the fuel that has entered the surge tank return to the related wing tank, by gravity, if the fuel levels and/or aircraft atitude is appropriate
- do not let fuel enter the surge tank from the wing tank.
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 ALL
B. Tests
(1) Before you do more steps, stop the refuel.
(a) Place a container (drum - 40 gall) under the applicable NACA vent.
(b) Remove all the spilt fuel in accordance with the local regulations.
(c) Clean the fuel spillage from the:
- area on the ground (hard standing)
- aircraft.
(2) Do a check of the refuel supply system (fuel tanker, hydrant or pump unit) delivery fuel pressure to make sure that it is not more than 50psi (3.45bar).
NOTE : This is important if a fuel spillage has occured on more than
____ one aircaft during refuels from the same (common) refuel supply unit.
This action can be initiated (started) at the same time as the FLSS high level light systems are tested, step (3).
This procedure from step (4) is:
- only valid for trouble shooting if the (refuel supply system) fuel pressure was known (guaranteed) to be less than 50psi (3.45bar)
- valid for the identification of possible damage to the refuel galleries.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞28-25-00∞∞∞∞∞∞∞∞∞∞Page 254
Nov 01/04R CES
(3) Do a complete test of the Fuel Level Sensing System, high level channels, as follows:
(a) Do the FLSS Bite Test (with the refuel panel door open) (Ref. AMM TASK 28-46-00-740-001).
1 Look at the FLSS STATUS page.
_
2 If any failures are shown (given), go to (Ref. TSM (CFDS) PB
_ 101) for the applicable task number and do the related trouble shooting.
(b) Do the Test of the Refuel Panel 800VU, High Level Lights at the (switch) positions LTS then TEST (Ref. AMM TASK 28-46-00-710-001).
1 If any failures are observed, go to (Ref. TSM (OBS) PB 101)
_ for the applicable task number and do the related trouble shooting.
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