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NOTE
During overwing gravity refueling, the pilots must ensure the aircraft is within center-of-gravity limits.
Do not open the overwing fueling caps unless the fuel quantity in the main tanks is below 93% capacity.
Pressure Defueling
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Select DEFUEL on the POWER switch;
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Ensure that the SOV switches of only those tanks that are to be defueled are in the OPEN position, and the remaining SOV switches are in the CLOSED position; and
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Apply suction from the fuel tender (max .8 psi) at the fuel/defuel adapter.
When the auxiliary tank or either main tank are fully defueled, their respective SOV CLOSED (green) light will illuminate, and the associated (white) SOV OPEN light will extinguish.
When defueling is complete, move the applicable tank SOV switches to CLOSE.
NOTE
If defueling pressure is applied and the POWER FUEL/DEFUEL switch is inadvertently selected OFF, fuel will be drawn from the main and auxiliary tanks only. Any fuel in the tail tank system will remain trapped, possibly creating a tail-heavy condition.
Gravity Defueling
The main and auxiliary tanks can be gravity defueled through a tank drain valve, which has an integral check valve. The tail cone tank may be drained through the DC-motor-operated dump valve.
The tank drain valves are installed on the lowest access cover of each tank, and sealed from the outside with a screwed-in cover plug. A special adapter is required to operate the check valve for gravity defueling operations.
FUEL SYSTEM Description Vol. 2 12.10.25
Oct 05/06
FUEL Control Panel
Figure 12.10.18
Fuel Quantity Indicators
Fuel quantity is displayed in the lower left side of the EICAS page. The sum of all tanks is displayed next to the word TOTAL. The next line indicates, respectively, left main, center auxiliary and right main tank fuel quantity. The tail tank readout is on the last line. Fuel quantity and fuel flow are normally displayed in lb (pounds), but can also be configured in kg (kilograms) at the Completion Center.
FUEL SYSTEM Description Vol. 2 12.10.26
Oct 05/06
Fuel quantity data can also be read on the optional interior refuel panel (behind the copilot seat).
NOTE
Total fuel quantity data must be entered in the FMS (PERF INIT page) prior to flight.
Bulk Fuel Temperature Indication
Temperature is monitored by a probe in the left main tank, and displayed on the SUMMARY page. Numerals are green at temperatures above .37°C. At or below .37°C, the numerals are amber, and an associated BULK FUEL TEMP caution EICAS message will be displayed.
Engine Fuel Temperature Indications
Temperatures are sensed by a probe located on the top of each engine’s fuel filter housing. Numerals are green above 5°C, and amber if below 5°C. An associated L (R) FUEL LO TEMP caution EICAS message will be displayed.
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