An electric fuel boost pump is installed in each wing collector tank and provides pressurized fuel for engines. Electric fuel boost pump is actuated during:
The pump operation is automatically controlled by the EFCU logic when the FUEL PUMP switch is in AUTO position.
The fuel tank quantity indication is the total amount of fuel remaining in the associated wing tank.
The fuel tank quantity indication is the total amount of usable fuel remaining in the associated wing tank.
The primary fuel pump is a venturi ejector pump (jet pump) with no moving parts, and is powered by the respective engine motive flow. It is a self-sustained pump and does not require electrical power to operate.
The EFCU provides a cockpit warning when the imbalance between both wing tanks is at:
What is the meaning of a fuel temperature shown in yellow?
The collector tank (inboard section) keeps the fuel pumps submerged, ensuring a constant fuel flow to the respective engine.
MFD Total Fuel Quantity Indication – It indicates the total fuel quantity remaining in both tanks. What is the meaning of the quantity displayed in green?
Each wing tank incorporates:
What is the meaning of a FUEL 1 (2) PSW FAIL advisory message?
A DC auxiliary pump, in each main tank, is provided for the engines during start, XFEED operation and in case of ejector pumps failure.
A DC auxiliary pump, in each collector tank, is provided for the engines during start, XFEED operation and in case of ejector pumps failure.
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Crossfeed Valve Knob (XFEED) - The crossfeed operation allows to balance the difference weight between left and right wing tanks. The LO1selection opens the crossfeed valve and turns on:
The DC auxiliary pumps operation is controlled by the EFCU (Electronic Fuel Control Unit).
What is the meaning of a FUEL EQUAL advisory message?
When losing one wing tank quantity indication, the total tank quantity indication will also be lost.
The XFEED operation should not be performed during takeoff and landing flight phases.
It is a "shall" not a "should". The XFEED operation shall not be performed during takeoff and landing flight phases.
The fuel temperature is measured in the right fuel tank.
The Electronic Fuel Control Unit (EFCU) monitors the resistance value of the sensor and provides the fuel temperature to be displayed on the MFD.
The electric pump is depicted as a circle with an internal windmill, representing the pump status. What is the meaning of a gray circle with a white windmill?
Fuel tank quantity indication - What is the meaning of a digital quantity displayed in GREEN?
A capacitive system measures the fuel quantity in each tank. The system is self-calibrated and does not require any adjustment. The signal from each tank is processed through a fully segregated channel of the Electronic Fuel Control Unit (EFCU) and transmitted to the cockpit.
What is the meaning of a FUEL 1 (2) LO PRES caution message?
Defueling is accomplished by means of a dump valve located under each wing where an appropriate device and hose can be connected. A water drain valve is fitted inside each dump valve.
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