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In order to achieve maximum fuel quantity in the auxiliary tank, pressure must be kept constant at the FUEL/DEFUEL ADAPTER. If an interruption of 30 seconds or more during refueling occurs, the FSCU will close the TAIL SOVs and the AUX SOV, preventing fuel from going to these tanks. If this occurs, the FSCU may be overridden by holding the OVERRIDE button on the FUEL/DEFUEL panel, or the POWER switch may be cycled OFF, then to FUEL. The affected TAIL and AUX SOV(s) will reopen, allowing more fuel into the tanks, unless the HIGH LEVEL SENSOR light of the affected tank has been triggered.
FUEL SYSTEM Description Vol. 2 12.10.20
Oct 05/06
If a long interruption occurs during refueling, and depending on how much fuel there is in the auxiliary tank at this stage, the forward and aft auxiliary tanks will not be further pressurized by the ejectors, and their vent valves will open. Their level will drop, and equalize with the center auxiliary tank. This will cause the level in the center auxiliary tank to rise, and if the level is high enough, it may trigger the auxiliary tank HIGH LEVEL SENSOR. If this is the case, the FSCU will not allow the AUX SOV to reopen, and only gravity refueling will be possible to fill the remaining volume of the auxiliary tanks.
Auxiliary Tank Quantity Indication
Since the auxiliary tank fuel quantity indication is generated using the center and forward auxiliary tank capacitance probes, the cockpit reading for the auxiliary tank during refueling does not immediately reflect actual auxiliary tank contents. Actual tank contents will only indicate after the three tank levels have equalized (approximately one to eight minutes later).
Override Button
The override button allows fueling/defueling of the auxiliary or tail tanks individually, provided the high-level sensor has not been triggered in the selected tank system. The override button must be held for the duration of individual auxiliary or tail tank fueling/defueling.
FUEL SYSTEM Description Vol. 2 12.10.21
Oct 05/06
IF INDIVIDUAL FUELING OF AUXILIARY OR TAIL TANKS HAS BEEN CARRIED OUT USING THE OVERRIDE BUTTON, THE C OF G LIMITS MUST BE CALCULATED MANUALLY.
FUEL/DEFUEL Panel Pressure Refueling
Figure 12.10.15
FUEL SYSTEM Description Vol. 2 12.10.22
Oct 05/06
Pressure Refueling (Auxiliary Tanks)
Figure 12.10.16
FUEL SYSTEM Description Vol. 2 12.10.23
Oct 05/06
Refuel/Defuel System Schematic
Figure 12.10.17
FUEL SYSTEM Description Vol. 2 12.10.24
Oct 05/06
Overwing Gravity Refueling
Gravity refueling will average 7% less volume than pressure refueling in the main and auxiliary tank systems, since the main and auxiliary overwing filler points are below the highest point of the respective tank. Overwing filler caps are installed on each wing. The auxiliary tank gravity refueling panel and cap are situated on the right wing root. The tail tank cannot be gravity refueled.
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