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Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
REFUEL/DEFUEL PANEL (CONT'D)
Pressure Refueling (Cont’d)
When auto refueling is terminated by the computer, the quantity showing in the TOTAL window is equal to that in the PRESEL window.
Auto refueling can be interrupted at any time by moving the START/STOP switch to the STOP position. Individual tank quantities can be seen in the other two windows of the display.
Manual Refueling
In MANUAL mode, it permits the operator to select and control the fuel quantity to be added in each tank through the refuel/defuel panel. In this mode, the high level sensors automatically close the refuel/defuel SOVs if the maximum fuel level capacity is reached.
Suction Defueling
Suction defueling of the fuel tanks is carried out by applying suction (recommended pressure .8 psig) to the single point refuel/defuel adapter, using the refuel/defuel control panel.
Pressure Defueling
Pressure defueling of the fuel tanks is accomplished through the fuel shutoff valves and single point adapter. Pressure defueling is identical to suction defueling, except that primary defueling flow is provided by the AC boost pumps or DC auxiliary pump in each feed tank.
NOTE
AC or DC electrical power is required to operate the airplane pumps for this procedure.
Direct pressure defueling of the wing tank is accomplished using the AC boost pumps or DC auxiliary pump in each feed tank.
Direct pressure defueling of the center tank is not possible. center tank fuel may however be transferred to the wing tanks using the center tank transfer pumps. From there, it may then be defueled via the wing tank.
Fault Reporting
Fault reporting is in the form of error messages which will appear in the display windows of the refuel/defuel panel. In the event of a fuel computer failure, a FMQGC”will be displayed in the TOTAL window and FAILURE in the PRESEL window. An example of fault reporting is illustrated below:
REPEATER
This indicates that two panels are powered on.
FGF1210_017
Error Messages
The following messages may be displayed on the refuel/defuel panel if a fault exists:
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
REFUEL/DEFUEL PANEL (CONT'D)
INHIBIT
In manual refuel or defuel mode, displayed when a tank switch is in the OPEN position. In pressure defuel mode, displayed when an engine is on (no fire handles pulled). In auto mode, displayed when the preselected fuel quantity is valid, airplane is in CAIMS maintenance mode or the SOV shutoff test fails.
FULL
Displayed when the high level shutoff has been activated.
LOAD ERROR
In auto refuel mode, displayed when an invalid fuel distribution is selected. Example, one tank contains more fuel than the target quantity assigned by the automatic distribution.
IMBAL
Displayed when a predetermined fuel quantity imbalance exists between the left and right wings.
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