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DEFUEL -- Configures
refuel/defuel system for
suction defueling.
OFF -- Shuts off refuel/defuel
system.
SOV switches (3)
ON -- Opens respective
shut--off valve
(SOV OP light comes on).
OFF -- Closes respective
shut--off valve
(SOV CL light comes on).
INC.
DEC.
ON
OFF
PRES. TOTAL QTY
FUEL AUTO
OFF
DEFUEL TEST
FUEL
MANUAL
LAMP
TEST
ON
POWER
FAULT
ANNUNC.
FUEL QTY
BITE
INITIA.
RIGHT
CL OP
ON
OFF
LEFT
H.LEVEL DETECTOR
CL OP SOV
ON
OFF
CL OP SOV
Vol. 1 13--50--7
REV 56, Jan 31/03
FUEL SYSTEM
Refueling and Defueling
Flight Crew Operating Manual
CSP A--013
MASTER
B. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Fuel System Refuel and
EMERG REFL
APU BAT DIR 5
B15
Defuel Panel FUEL/DEFUEL
B14
REV 56, Jan 31/03
Vol. 1 13--50--8
FUEL SYSTEM
Refueling and Defueling
Flight Crew Operating Manual MASTER
CSP A--013
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 13--60--1
REV 56, Jan 31/03
FUEL SYSTEM
Fuel Quantity Gauging
Flight Crew Operating Manual
CSP A--013
MASTER
1. FUEL QUANTITY GAUGING SYSTEM
The fuel system computer (FSC) monitors information from fuel probes in each tank to
calculate the fuel quantity.
Fuel quantity is measured using fuel probes, which provide signals directly proportional to
fuel level to the FSC. There are 6 probes in each wing tank and 3 in the centre tank. A
compensator probe in each wing tank supplies data to the FSC to compute fuel density
corrections.
Fuel quantity gauging is calibrated for both ground and flight operations by the the computer
which receives weight-on-wheel signals from the proximity sensing electronic unit (PSEU).
In flight, the computer takes into account the effects of wing deflection and aircraft attitude
on the fuel quantity measurement.
Corrected individual tank quantities, total fuel quantity, fuel used quantity and fuel
temperature are displayed on the Engine Indication and Crew Alerting System (EICAS) as
well as any fault detected in the fuel quantity gauging computer.
The FUEL USED indication on the FUEL synoptic page can be reset to zero through the
EICAS menu page.
The FUEL USED indication on the FUEL synoptic page can be reset to zero through the
FMS, ACT PERF INIT page. If the FMS is failed or not available, the FUEL USED indication
can be reset to zero through the EICAS menu page.<0039>
The temperature of the fuel is continuously monitored by a fuel temperature sensor installed
in the left wing tank. The sensor supplies a fuel temperature signal to the EICAS for display
on the FUEL synoptic page.
REV 56, Jan 31/03
Vol. 1 13--60--2
FUEL SYSTEM
Fuel Quantity Gauging
Flight Crew Operating Manual MASTER
CSP A--013
Refuel/Defuel --- EICAS Messages <MST>
Figure 13---60---1
Status Page
Primary Page
<0039>
<0039> <0006>
FUEL CH 1, 2 FAIL
status (white)
Comes on to indicate
that the respective
channel of the fuel
system computer has
failed.
<0039>
Vol. 1 13--60--3
REV 56, Jan 31/03
FUEL SYSTEM
Fuel Quantity Gauging
Flight Crew Operating Manual
CSP A--013
MASTER
Refuel/Defuel System --- Fuel Synoptic Page Indications <MST>
Figure 13---60---2
Fuel Page
P
FUEL USED Quantity
Readout
Indicates the amount of
fuel used, i.e. , in lb or in
kg <0001>.
Five amber dashes are
displayed if input data is
invalid.
FUEL CH 1/2 FAIL status (white)
Comes on to indicate that the respective
channel of the fuel system computer has failed.
FUEL CH (1,2) FAIL status (white)
Comes on to indicate that the respective
channel of the fuel system computer has failed.
FUEL CH 1/2 FAIL caution (amber)
Comes on to indicate that both channels
of the fuel system computer has failed.
REV 56, Jan 31/03
Vol. 1 13--60--4
FUEL SYSTEM
Fuel Quantity Gauging
Flight Crew Operating Manual MASTER
CSP A--013
Fuel System --- Menu Page
Figure 13---60---3
Data Entry Message
Comes on when the
cursor goes to the
ACCEPT line after
selection of the FUEL
USED RESET line.
Menu Page
Vol. 1 13--60--5
REV 56, Jan 31/03
FUEL SYSTEM
Fuel Quantity Gauging
　
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