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REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
12−10−21
REFUEL/DEFUEL PANEL (CONT'D)
Pressure Refueling (Cont’d)
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.
In “AUTOMATIC” mode, fuel quantity added to each tank is automatically controlled by the
FMQGC to give the correct distribution for the presented total quantity. Refueling flow is stopped
when the total fuel quantity reaches the preselect quantity and the appropriate SOVs are
commanded close.
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.
· Wing Tank − Suction defueling of the wing tanks is accomplished by opening a valve which
connects the refuel/defuel manifold to the engine feed line. This allows fuel to be drawn out
of the tank through the suction defuel check valve in the feed tank.
· Centre Tank − The centre tank is defueled through the refuel/defuel shutoff
valve.
· Aft Tank − The aft tank may be suction defueled using the same line and shutoff
valve used
for pressure refueling of the tank.
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 centre tank is not possible. Centre tank fuel may however be
transferred to the wing tanks using the centre 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 pump. From the wing tank, it may
then be defueled via the wing tank.
FUEL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
12−10−22
REFUEL/DEFUEL PANEL (CONT'D)
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.
GF1210_022
LEFT CENTRE RIGHT
TOTAL AFT PRESEL
10000 8000 10000
30000 2000 REPEATER
If installed, the following information may be displayed in either or both quantity windows:
IMBALANCE
Displayed if an imbalance condition exists.
The tank affected displays will alternate
between IMBAL and tank quantity every two
seconds.
GF1210_023
PRESEL
RIGHT
AFT
TOTAL
LEFT
CTR
30000
10000
8000
LB 30000
10000
2000
LB
20000
IMBAL
2000
LB
Error Messages
The following messages may be displayed on the refuel/defuel panel if a fault exists:
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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