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pressure refueling of the tank.
SUCTION DEFUEL
The procedure for suction defuel is as follows:
• Open the RDCP access panel
• Place the MASTER switch in the ON position
• Allow the FMQGC to conduct BITE test until tank quantities are displayed steady
in all windows
NOTE
If a system fault is detected, the windows will display dashed
lines or error message(s) in the individual tank windows instead
of quantities. Do not proceed without investigating and rectifying
fault.
• Verify no error messages are displayed in any of the individual tank quantity
windows
• Verify all MANUAL tank switches are in the CLOSE position
• Verify the AUTO REFUEL switch is in the mid position marked AUTO REFUEL
• Note the quantities in the TOTAL and PRESEL windows. They should be the
same
• Move the MODE SELECTOR switch to the position marked MANUAL DEFUEL
• Verify the PRESEL window displays the message DEFUEL
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
11-40 For Training Purposes Only
Sept 04
• Connect the refuel tender to the single point adapter and adjust the tender pressure
to negative 8 psig (suction) maximum
• Select the desired tank MANUAL switches to the OPEN position
• Verify tank quantities show decrease
• When the desired fuel quantity for the selected tank is displayed on the tank
window, return the MANUAL switch to the CLOSE position to terminate the
defueling operation
• Move the MODE SELECTOR switch to AUTO REFUEL
• Disconnect the tender as required and return the RDCP MASTER switch to the
OFF position
• Secure RDCP access 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.
Direct pressure defueling of the aft fuselage tank is not possible. Aft fuselage tank fuel
may however be transferred to the wing tanks using the aft transfer pumps. From the
wing tank, it may then be defueled via the wing tank.
LATER VERSION RDCP REFUEL/DEFUEL PROCEDURES
Differences in Later Refuel/Defuel Panel are as follows:
• The MODE SELECTOR switch is now rotary and includes the aft tank control
switch
• The START/STOP switch now includes the SOV test function
• The master ON/OFF switch is part of the mode selector switch
For Training Purposes Only
Sept 04
11-41
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
EICAS MESSAGES
GX_11_026
AFT XFER OFF SCHED
FUEL COMPUTR FAIL
FUEL LO QTY
L (R) FUEL RECIRC FAIL
L (R) PRI FUEL PUMPS
WING TO CTR LEAK
FUEL IMBALANCE
FUEL UNIT MISMATCH
FUEL XFER FAIL
FUEL XFER ON
FUEL XFER FAIL
FUEL XFER ON
FUEL TEMP SENSOR
FUEL UNIT MISMATCH
The refuel/defuel panel and
EICAS indications are correct
but in different units of
measurements.
AFT XFER OFF SCHED
Indicates that fuel transfer from
the aft tanks to the wings is
unable to keep pace with the
optimum aft transfer schedule.
FUEL XFER ON
Indicates that fuel is being
transferred from the left wing
tank to the right wing
unrequested.
FUEL XFER ON
Indicates that fuel is being
transferred from the right wing
tank to the left wing
unrequested.
FUEL COMPUTR FAIL
Indicates that both channels of
the fuel system computer have
failed.
L (R) PRI FUEL PUMPS
Indicates both left or both right
forward and aft primary AC
pumps have failed to operate
when requested.
WING TO CTR LEAK
Indicates that the fuel level in
the center tank has increased by
600 lbs or more.
FUEL XFER FAIL
Transfer from the left wing to the
right wing has been requested
and failed.
FUEL XFER FAIL
Transfer from right wing to left
wing has been requested and
failed.
FUEL TEMP SENSOR
On ground, indicates that a fuel
temperature sensor is failed.
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