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START.STOP/SOV TEST
FUEL SOVs
START . Initiates refueling.
Allows tanks to be
STOP/SOV TEST . Stops
manually. automatic refueling or enables testing of the refuel SOVs and circuitry during fueling.
refueled or defueled
AUTO MODE MODE SELECTOR OFF POSITION
AUTO REFUEL . Enables MANUAL REFUEL . OFF . Removes
automatic refueling. Enables manual refueling using the fuel SOVs. power form the panel.
MANUAL DEFUEL.
Enables manual defueling
using the fuel SOVs.
FGF1210_016
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
REFUEL/DEFUEL PANEL (CONT'D)
Normal Fuel Loading
The normal fuel loading logic as planned by the FMQGC is as follows:
.
Wing tanks only if the required fuel load is equal to or less than the wing tank capacity.
.
Any fuel in excess of the wing tank capacity is placed in the center tank.
NOTE
The fuel computer always strives to keep between 0 and 400 lb maximum lateral imbalance, however, the software allows the imbalance to reach 1100 lb before shutting down and going into INHIB mode.
Gravity Refueling
The wing tanks may be refueled through over wing gravity fill adapters located on top of both left and right wings. It is not possible to completely fill either wing tank by gravity fueling, since the fill adapters are located outboard and below the maximum fuel level.
The center tank may be refueled through a gravity fill adapter located on top of the right hand wing.
Pressure Refueling
Pressure refueling is accomplished through the single point refuel/defuel adapter, located in the right hand wing root and is controlled by the refuel/defuel control panel. An optional duplicate refuel/defuel control panel can be installed in the flight compartment.
NOTE
A SHUTOFF TEST must be carried out prior to all refueling operations.
If the test is successful a SOV PASS is displayed in the PRESEL window. If the test fails a SOV FAIL is displayed in the PRESEL window. SOV FAIL will be displayed in the tank window for the failed shutoff valve, alternating display of the tank quantity.
Pressure refueling may be performed in either AUTOMATIC or MANUAL mode. The airplane does not have a fuel jettison system.
A preselect fuel quantity is used during automatic refueling of the airplane. This method will allow the airplane to be filled automatically to the desired fuel state selected.
NOTE
The preselect quantity is the desired final total fuel quantity in the tanks and not the quantity to be added.
The computer determines the required distribution of fuel into each of the aircraft tanks to achieve the preselected value and controls each refuel valve accordingly. The refuel schedule (planning only) will fill the wings first, then the center tank. If the center tank is used, it will be fueled to a minimum of 500 pounds to ensure pump priming. The shutoff point, for each tank, is “anticipated” by the computer by monitoring the refueling rate to determine the correct shutoff point for each individual refueling operation.
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