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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 manually
controlled from the refuel panel. A high-level sensor is provided in each tank to prevent the tanks from being overfilled
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
FUEL
Volume 2 Flight Crew Operating Manual Sep 13/2004
12-01-10 CSP 100-6 REV 1
FUEL INDICATION AND CONTROL (Cont)
FUEL QUANTITY GAGING
DESCRIPTION
Fuel quantities are displayed in lbs or kg on the EICAS and FUEL synoptic displays.
COMPONENTS AND OPERATION
FUEL COMPUTER
The dual-channel fuel system automatically calculates the quantity of fuel in the wing tanks. Each channel receives signals
from the fuel system and aircraft attitude information from the AHRS. The computer uses the information to calculate the
fuel weight in each tank.
CONTROLS AND INDICATION
DESCRIPTION
The FUEL control panel provides control and system indications for the fuel system. The panel controls the boost pumps
and provides manual control and indications of the gravity and powered crossflow system.
Fuel system information is presented on the EICAS and FUEL synoptic pages. Fuel temperature is displayed in degrees
celsius and quantity is displayed in pounds or kilograms.
The refuel/defuel control panel controls all of the refueling and defueling operations. It tests the integrity of the components
of the fuel system and displays individual fuel tank quantities.
FUEL CONTROL PANEL
L (R) PUMP, GRAVITY XFLOW, and XFER are selected on the FUEL control panel.
GRAVITY
XFLOW
FUEL
XFER OFF
AUTO
R PUMP
OFF ON
AUTO
L PUMP
ON
CFO1201002_004
FUEL
May 06/2005 Flight Crew Operating Manual Volume 2
REV 2 CSP 100-6 12-01-11
CONTROLS AND INDICATION (Cont)
FUEL DISPLAY
The fuel display synoptic page presents digital indications of fuel flow and quantity.
Fuel flow is indicated in either pounds per hour (PPH) or in kilograms per hour (KPH). Magenta dashes will be displayed
if the input value is invalid.
Fuel tank quantity for the left and right fuel tanks are presented in pounds or kilograms.
FUEL TEMPERATURE READOUTS
Bulk fuel temperature readout indicates the temperature of the fuel in the right wing. Green readouts indicate temperatures
above -38.3 °C (-36.9 ° F), while a WING FUEL TEMP LOW(C) CAS message indicates -38.2 °C (-36.7 ° F) or below.
FUEL QUANTITY INDICATIONS
TOTAL FUEL
Green digits indicate total fuel quantity over 600 lb (272 kg) and each wing over 300 lb (136 kg).
LEFT OR RIGHT WING TANKS
Amber digits and a FUEL IMBALANCE (C) CAS message will illuminate if the following conditions exist:
- 250 lb (113 kg) or more with a total fuel weight of more than 13 700 lb (6214 kg)
- 315 lb (143 kg) or more with a total fuel weight between 13 700 (6214 kg) and 10 000 lb (4536 kg)
- 450 lb (204 kg) or more with a total fuel weight between 10 000 lb (4536 kg) and 4700 lb (2132 kg)
- 600 lb (272 kg) or more with a total fuel weight of less than 4700 lb (2132 kg)
FUEL USED
This indication shows the amount of fuel used since the counter was reset. The reset is carried out automatically on powerup
by the FADEC. Magenta dashes indicate the input data is invalid.
　
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