FUEL
Sep 13/2004
Flight Crew Operating Manual
Volume 2
REV 1
CSP 100-6
12-01-09
FUEL INDICATION AND CONTROL
DESCRIPTION
The fuel indication and control system provides fuel quantity indication and control of refuel and defuel functions. The
system consists of the fuel quantity gaging computer, fuel quantity probes, fuel temperature probes, fuel level sensors, and
the refuel/defuel panel.
COMPONENTS AND OPERATION
FUEL QUANTITY PROBES
Nine fuel quantity probes are distributed throughout each wing tank. The probes provide fuel level indications to the fuel
quantity gaging computer.
FUEL TEMPERATURE PROBE
The fuel temperature probe is located in the right wing tank and provides temperature information to the fuel indicating
system.
FUEL LEVEL SENSORS
A tank full fuel level sensor is located at the top of each tank. This sensor provides a cutoff signal to the refuel valve when
the tank is full.
FUEL QUANTITY GAGING COMPUTER
The fuel quantity gaging computer provides the following functions:
- Fuel quantity probe, fuel density probe, fuel level, fuel temperature, and sensor signal processing. The
fuel computer uses weight-off-wheels indications and pitch and roll attitude from the AHRS to correct the fuel
quantity probe data and display accurate fuel quantity information on the EFIS.
- Failure monitoring and indication to EICAS and the maintenance diagnostic computer.
- Automatic control of refueling and defueling when selected.
- Engine oil level indication to the refuel/defuel panel.
REFUEL/DEFUEL CONTROL PANEL
Pressure refueling and suction defueling can be conducted using the single-point fuel port and the refuel/defuel panel, both
located in the right wing root leading-edge fairing. The controls allow the required total fuel load to be preselected and
automatically controlled by the fuel system computer. Alternatively, the quantity of fuel loaded into the aircraft can be man-
ually controlled from the refuel panel. A high-level sensor is provided in each tank to prevent the tanks from being over-
filled if the automatic or manual refuel control fails. For testing the operation of the refuel shutoff valve, a control allows
high-level sensor operation to be simulated electrically and checks the refuel valves closure.
OFF
TEST
ON
OFF
001
ON
OFF
DEFUEL
FUEL
MANUAL
FUEL AUTO
LEFT
H. LEVEL
DETECTOR
S.O.V.
FUEL QTY
Lbs
PRESS. TOTAL QTY
INC.
DEC.
LAMP
TEST
ENGINE OIL LEVEL
FULL
CHECK OIL
RIGHT
LEFT
RIGHT
CL
OP
CL
OP
ON
POWER
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