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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.
FUEL
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
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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
LEFT CENTER RIGHT
TOTAL PRESEL
10000 1000 10000
21000 REPEATER
Error Messages
The following messages may be displayed on the refuel/defuel panel if a fault exists:
FUEL
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
12−10−19
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.
REPEATER
Displayed in the PRESEL window of the external refuel/defuel panel when two panels are powered
ON. The panel located in the flight compartment is in control and the outside panel provides
quantity display only.
Dashes ( _ _ _ _ _ _ ) will be displayed for fuel quantity if the computed value is invalid.
FAILED
Displayed in the PRESEL window if the refuel/defuel panel is not functional.
FMQGC − FAILURE
FMQGC will be displayed in the TOTAL window and FAILURE in the PRESEL window if the
refuel/defuel panel is not communicating with the fuel computer.
FUEL
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
12−10−20
REFUEL/DEFUEL PANEL (CONT'D)
　
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