Refueling is accomplished through an overwing filler cap located at the outer, upper section of each wing. Each wing has a usable fuel capacity of:
Total Fuel Capacity 406.8 US gal, 2,736.5 lb (1,540 liters, 1,241.3 kg) and Total Usable Fuel 402 US gal, 2,703.6 lb (1,521.5 liters, 1,226.4 kg)
Low fuel pressure, low fuel quantity and low fuel temperature will be shown in the Crew Alerting System (CAS) window.
Low fuel pressure, low fuel quantity and fault conditions will be shown in the Crew Alerting System (CAS) window. Low fuel temperature is not available.
The FUEL RESET command is disabled if the FCMU computer detects:
Fuel supply greater than engine demand is returned from the fuel control unit to the:
The left and right tank fuel quantities are shown digitally and the total fuel quantity, fuel flow, endurance and fuel used values are shown as analog.
The left and right tank fuel quantities are shown as analog and the total fuel quantity, fuel flow, endurance and fuel used values are shown digitally.
Fuel symmetry is maintained automatically by the Fuel Control and Monitoring Unit (FCMU).
The transfer and delivery of fuel is achieved using a motive flow jet pump system and two engine driven pumps which are:
The distribution system transfers fuel from left and right main tanks to the collector tank in each wing and delivers fuel from the collector tanks to the engine fuel control unit. Within the tanks are:
Tolerances of the fuel flow measurement system can lead to a conservative digital value of the measured fuel burn and the remaining fuel quantity. The pilot can on longer flights update the digital fuel quantity indication with the actual fuel value on board, by pressing the FUEL RESET soft key. Fuel reset in flight should only be used when:
Fuel reset will also reset the fuel used to zero.
In the event of a system failure, the fuel load symmetry can be maintained by manually selecting the FUEL PUMPS switch to ON for the fuel tank with the lower quantity until a balanced fuel condition is restored and then setting the switch to AUTO.
In the event of a system failure, the fuel load symmetry can be maintained by manually selecting the FUEL PUMPS switch to ON for the fuel tank with the higher quantity until a balanced fuel condition is restored and then setting the switch to AUTO. The pilot(s) will monitor the fuel quantity gauges for fuel symmetry for the remainder of the flight.
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The tanks in each wing contain _____ capacitance type fuel quantity probes that are connected to the fuel computer part of the FCMU. The resistance temperature detector type fuel low level sensors in the collector and main tanks are connected to the low-level sensing part of the FCMU.
A FUEL RESET softkey in the FUEL window is used to re-datum the total fuel quantity and fuel used value after each time fuel is added to the wing tanks. These values are stored in non-volatile memory when power is removed.
The green PUMP captions confirm correct pump operation.
The green PUMP captions indicate that the electric booster pumps have been selected to ON, by the overhead panel switches or by the automatic fuel balancing or due to low fuel pressure. The green PUMP captions do NOT confirm correct pump operation.
Power for the FCMU fuel computer is taken from the ESSENTIAL BUS through the FUEL QTY circuit breaker. Power for the low level sensing part of the FCMU is from the MAIN BUS through the FUEL LOW LEVEL circuit breaker.
The CAS window of the systems MFD will displays an amber 'LH/RH FUEL LOW' caution when:
Fuel symmetry is automatically maintained by the FCMU when:
Left and right fuel quantities are monitored to detect fuel asymmetry exceeding _____ and will activate the fuel booster pump in the tank with the higher quantity.
The CAS window of the systems MFD will displays an amber 'FUEL PRESSURE LOW' caution when:
Electric booster pumps provide pressure during the engine start sequence, as a standby function when the normal system cannot maintain adequate pressure and are used to balance the fuel level in each wing.
Maximum Fuel Imbalance is:
Maximum 3 segments on indicator.
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