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FUEL SYSTEM Description Vol. 2 12.10.18
Oct 05/06
GALLONS GALLONS
LOCATION
POUNDS KILOS LITERS(US) (IMP)
Total capacity 129 59 19 16 72 Unusable fuel is the quantity of trapped and residual fuel.
Components and Operation
FUEL/DEFUEL Panel
The FUEL/DEFUEL panel has controls for testing the systems’ functionality, and to initiate or terminate selective tank fueling or defueling. Maximum pressure during refueling is 50 psi, and maximum defueling pressure is negative 8 psi. The maximum fuel imbalance for structural integrity is 2,500 lb between the two main tanks.
To ensure FUEL/DEFUEL panel power has been turned off, a power kill switch disconnects the panel from the APU battery direct bus, when the panel is stowed and the door closed.
FUEL/DEFUEL Panel Operational Test
To complete the test:
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Fuel adapter and pressure must be available from the tender (max 50 psi);
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Place POWER switch to the FUEL position;
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Select all SOV switches to the OPEN position (all five white SOV OPEN lights illuminate);
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Push and hold the SHUTOFF TEST switch (to check automatic fueling shutoff feature);
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Verify that:
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All four white HIGH LEVEL SENSOR lights illuminate;
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All five SOV OPEN lights extinguish; and
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All five green SOV CLOSED lights illuminate.
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Release the SHUTOFF TEST button to verify that all the above lights revert to their status prior to test start; and
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Start refueling.
NOTE
The functional test of the refueling system must be conducted prior to each refueling. During the test, the high-level sensors generate a false high-level signal to the FSCU, which then closes the refuel shutoff valves.
FUEL SYSTEM Description Vol. 2 12.10.19
Oct 05/06
Fuel/Defuel Panel Operation Test Figure 12.10.14
Pressure Refueling
For partial fuel loads, it is recommended to fill the main tanks completely first, then the auxiliary and tail tanks, as required. For safety reasons, and to maintain proper C of G, the FSCU will prevent refueling of the auxiliary tank without the tail tank being selected. The auxiliary and tail tanks must always be selected together, and the refuel SOVs must be confirmed open, to ensure proper filling of the auxiliary and tail tanks.
To open the shutoff valve (SOV) for the respective tank, toggle the appropriate SOV switch to OPEN. When the tank is full, the respective HIGH LEVEL SENSOR light and SOV CLOSED light will illuminate, to indicate the SOV has closed automatically. Should this fail, as evidenced by fuel dumping overboard from the vent system, toggle the switch down to manually close the SOV.
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