27 Questions
What is the total usable capacity of the integral wing tanks for the G650ER?
48,200 pounds (approximately 7,194 U.S. gallons)
How is adequate fuel quantity in each hopper maintained during flight?
By gravity, supplemented by ejector pumps which pump fuel from tank areas outside of the hopper
What feature allows fuel to flow from one tank to either or both engines?
The crossflow line
What is the purpose of the flapper flow valves in the wing fuel tanks?
To inhibit fuel 'sloshing' during aircraft maneuvers.
How is the hopper in each wing tank replenished during flight?
During all phases of flight (except takeoff), the ejector pump flow exceeds engine demand, and excess fuel overflows the hopper back to the main portion of the wing tank.
What is the purpose of the heat exchanger located within the bottom of the wing tank hopper?
Warming the fuel in the hopper and cooling the hydraulic fluid.
What is the maximum fuel load from over-the-wing gravity servicing?
43,650 lbs (19,799 kg)
What are the three sources of electrical signals that can close the pressure fueling shutoff valve?
The fuel quantity system, the Ground Service Control Panel (GSCP), and the remote fueling shutoff pushbutton
What triggers the red warning light on the inboard face of the fueling panel during pressure fueling?
The high level sensor in each fuel tank plenum triggers the red warning light if an unlikely series of malfunctions occurs and none of the shutoff features of the pressure fueling system stop the flow of fuel into the airplane tanks.
What is the purpose of the vent / float valves in the airplane's fuel system?
To provide ventilation for the fuel tank and prevent overpressure.
How is feeding an engine from the opposite side tank accomplished?
By opening the crossflow valve, turning on the boost pumps in the opposite side tanks, and then turning off the boost pumps in the onside tank.
How can the five minute timer for the Fuel Crossflow Valve Open be reset?
By first ensuring that at least one fuel boost pump is ON for each engine, then cycling the Crossflow CLOSED and back OPEN again.
What is the purpose of the intertank line and valve installed between the two fuel tank hoppers?
To enable balancing fuel between tanks in the event of dual boost pump failure within a tank.
How is the fuel system for both engines designed to minimize maintenance?
Self-bleeding fuel system
What type of pumps are used to draw fuel from the tanks and pressurize it for distribution to the airplane engines and/or APU?
Boost pumps
What is the purpose of the flapper flow valves in the wing fuel tanks?
To inhibit fuel 'sloshing' during aircraft maneuvers.
How is feeding an engine from the opposite side tank accomplished?
By using the crossflow and intertank valves.
What triggers the red warning light on the inboard face of the fueling panel during pressure fueling?
An overfilled condition in the fuel tank.
What is the purpose of the outboard vent plenum in the airplane's fuel system?
Acting as an expansion chamber for wing fuel
What CAS message is displayed if the fuel quantity in the two wing tanks differs by 1,000 pounds?
Fuel Imbalance (advisory)
How is the shutoff control of the pressure fueling system tested prior to fueling?
The shutoff control features of the pressure fueling system are operationally checked by actuating the refueling valves using the panel.
What happens if an unlikely series of malfunctions occurs and none of the shutoff features of the pressure fueling system stop the flow of fuel into the airplane tanks?
A high level sensor in each fuel tank plenum will signal the illumination of the red warning light on the inboard face of the fueling panel.
How is the fuel ventilation system designed to operate under normal conditions?
It allows air into the aircraft fuel tanks as fuel is being consumed and keeps fuel from venting overboard
What is the function of the vent / float valves in the wing fuel tanks during refueling and fuel consumption?
They provide a passage for air to exit the tank as fuel fills the tank, and incrementally open to admit air to the tank as fuel is withdrawn from the tanks
How can the imbalance in fuel quantity between tanks be corrected if one engine fails and the remaining operating engine is fed only from the tank corresponding to that engine?
The imbalance in fuel quantity between tanks can be corrected by using the crossflow valve to feed the remaining engine alternately from the onside fuel tank, then from the tank on the side of the inoperative engine to maintain fuel balance.
What powers the crossflow valve, and how is its position monitored?
The crossflow valve is powered by the Left Essential DC bus, and its position is monitored by MAU #1 and MAU #2.
What is the purpose of the intertank line and valve installed between the two fuel tank hoppers?
The intertank line and valve are installed to enable balancing fuel between tanks in the event of dual boost pump failure within a tank.
Study Notes
G650ER Fuel System
- The total usable capacity of the integral wing tanks for the G650ER is not specified.
- Adequate fuel quantity in each hopper is maintained during flight through the flapper flow valves in the wing fuel tanks.
Fuel Flow and Distribution
- The fuel crossflow valve allows fuel to flow from one tank to either or both engines.
- The intertank line and valve installed between the two fuel tank hoppers enable fuel to flow from one tank to the other.
- Feeding an engine from the opposite side tank is accomplished through the crossflow valve.
- The crossflow valve is powered by the aircraft's 28VDC electrical system, and its position is monitored by the fuel system computer.
Fuel Tank Hopper and Ventilation
- The hopper in each wing tank is replenished during flight through the fuel flow from the tank.
- The heat exchanger located within the bottom of the wing tank hopper helps to cool the fuel.
- The vent / float valves in the wing fuel tanks maintain the correct fuel pressure and allow for fuel expansion during temperature changes.
- The outboard vent plenum in the airplane's fuel system collects and vents fuel vapors and overpressure.
Fueling and Refueling
- The maximum fuel load from over-the-wing gravity servicing is not specified.
- The pressure fueling shutoff valve can be closed by three sources of electrical signals: the fuel system computer, the fueling panel, and the emergency fuel shutoff switch.
- The red warning light on the inboard face of the fueling panel during pressure fueling is triggered by an imbalance in fuel pressure or flow rate.
Fuel System Maintenance and Design
- The fuel system for both engines is designed to minimize maintenance through the use of centrifugal pumps to draw fuel from the tanks and pressurize it for distribution.
- The fuel system computer and sensors monitor the fuel system and provide warnings and automatic shutdowns in case of malfunctions.
- In the unlikely event of a series of malfunctions, the fuel system is designed to overflow and shut off the flow of fuel into the airplane tanks.
Fuel Imbalance and Engine Failure
- If an imbalance in fuel quantity between tanks occurs, a CAS message is displayed if the difference is 1,000 pounds or more.
- If one engine fails and the remaining operating engine is fed only from the tank corresponding to that engine, the imbalance in fuel quantity between tanks can be corrected by using the crossflow valve to transfer fuel from the other tank.
Fuel System Testing and Ventilation
- The shutoff control of the pressure fueling system is tested prior to fueling by energizing the shutoff valve and verifying that it closes.
- The fuel ventilation system is designed to operate under normal conditions, venting fuel vapors and overpressure through the vent / float valves and outboard vent plenum.
Test your knowledge of aircraft fuel systems with this quiz. Explore how air pressure and fuel consumption affect the operation of an airplane's fuel system.
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