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HIGH-LEVEL SENSORS
The high-level sensors provide the fuel computer with a tank full signal, and provides for a 3% expansion space. When the high-level sensor signals the computer a full condition during refueling operations, the computer closes the respective re-fuel shutoff valve.
REFUEL/DEFUEL SINGLE-POINT ADAPTER
The refuel/defuel single-point adapter lets the operator connect the refueling nozzle to the aircraft to refuel or defuel. The adapter is installed in the right fuselage fairing just forward of the right wing.
GRAVITY REFUELING
Gravity refueling is accomplished only in exceptional circumstances. The refueling process is done through the filler ports located on the upper wing surfaces. Due to the shallow depth of the wing at the location of the filler cap, a protective plate is provided in the tank in order to avoid damage to the bottom skin by the refueling nozzle.
The gravity filler port and cap for each wing tank is located approximately mid-wing.
WARNING: Gravity filler caps for the wing tanks are located below the maximum pressure refueling level. Never re-move the gravity filler caps if the wing tanks are full or fuel quantity is unknown.
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
12-01-08 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.
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