CH12 FUEL Flashcards
What does the ON position of the fuel pump switch indicate?
The fuel pump is selected ON.
What does the OFF position of the fuel pump switch indicate?
The fuel pump is selected off.
What does an illuminated amber light for Forward and Aft Fuel Pump Pressure indicate?
Fuel pump output pressure is low.
What does an illuminated amber light for Center Fuel Pump Pressure indicate?
Fuel pump output pressure is low with the pump selected ON.
Under what condition is the illumination of the Center Fuel Pump Pressure light inhibited?
When the center tank fuel pump switch is selected off.
What does the ON position of the CROSSFEED switch indicate?
The crossfeed valve is selected open.
What does the OFF position of the CROSSFEED switch indicate?
The crossfeed valve is selected closed.
What does an illuminated amber CROSSFEED VALVE light indicate?
The crossfeed valve is not in the selected position.
What does the ON position of the BALANCE switch indicate?
The balance system is selected on.
What are the conditions under which the BALANCE switch can be OFF?
- System is not commanded ON
- Off is manually selected
- Fuel balance is automatically commanded off for one of the following:
- Fuel is balanced
- Jettison system is active
- FUEL DISAGREE message is displayed
What does the BALANCE Switch do when it is ON?
The balance system is selected on.
What does it mean when the BALANCE Switch is OFF?
The system is not commanded ON, off is manually selected.
When is the fuel balance automatically commanded OFF?
When one of the following occurs:
* fuel is balanced
* jettison system is active
* FUEL DISAGREE message is displayed
* FUEL QTY LOW message is displayed
* airplane is on ground and either engine running
What does an illuminated (amber) Fuel BALANCE FAULT Light indicate?
A system fault has occurred and the fuel balance system is inoperative.
What is the purpose of the Fuel Jettison System?
To manage fuel levels by jettisoning fuel.
What does the FUEL JETTISON NOZZLE control?
It controls the fuel jettison operation.
What does the term ‘ARMED’ signify in the context of the fuel jettison system?
The jettison system is ready to operate.
Fill in the blank: The Fuel Jettison System should not be activated at _______.
FLAPS 30
True or False: The Fuel Jettison System can be activated while in the ‘DO NOT JETT AT FLAPS 30’ state.
False
What happens when the Fuel Jettison NOZZLE Switch is ON?
The jettison nozzle valve is selected open in flight and opens main tank defuel/isolation valves and center tank jettison isolation valves if jettison is armed.
This is a critical function for managing fuel during flight.
What does it indicate when the Fuel Jettison Nozzle VALVE Lights are illuminated (amber)?
The jettison nozzle valve is not in the selected position.
This alerts the crew to a potential issue with the fuel jettison system.
What does the Fuel Jettison ARM Switch do when ARMED?
It arms the jettison system and initializes fuel-to-remain at the MLW fuel quantity.
This is essential for ensuring safe landing conditions.
What occurs when the Fuel Jettison ARM Switch is OFF?
It disarms the jettison system.
This indicates that the jettison operation cannot proceed.
What does it mean when the Fuel Jettison FAULT Light is illuminated (amber)?
A system fault has occurred and fuel jettison is inoperative.
Immediate attention is required to resolve the fault.
What is the function of the FUEL TO REMAIN Selector when PULL ON?
It changes the mode from MLW (maximum landing weight) to MAN (manual).
This allows for manual adjustment of fuel levels.
How does rotating the FUEL TO REMAIN Selector clockwise affect the fuel quantity?
It increases the MANUAL fuel-to-remain quantity.
Precise control over fuel management is critical during flight.
What happens when the FUEL TO REMAIN Selector is rotated counterclockwise?
It decreases the MANUAL fuel-to-remain quantity.
This allows the crew to adjust fuel levels as needed.
What does pushing the FUEL TO REMAIN Selector do?
Automatically selects the MLW fuel-to-remain quantity.
This ensures that the aircraft maintains the necessary fuel for safe landing.
What conditions trigger the expanded FUEL QTY display?
The expanded FUEL QTY display appears for the following conditions:
* crossfeed valve open
* one or more fuel tank quantity indications are inoperative
* the FUEL IN CENTER alert message is displayed
* the FUEL QTY LOW alert message is displayed
* the FUEL LOW CENTER alert message is displayed
* the FUEL FLOW ENG alert message is displayed
* the INSUFFICIENT FUEL alert message is displayed
* the FUEL IMBALANCE alert message is displayed
* the airplane is on the ground and both engine(s) off
* the balance system is active
* the balance system is selected on and fuel is already balanced
None
What indicates a fuel imbalance on the expanded fuel quantity display?
A fuel imbalance pointer is displayed next to the low tank quantity for the following conditions:
* Solid amber pointer: FUEL IMBALANCE message displayed
* Solid white pointer: FUEL IMBALANCE message not displayed, main tank fuel differs by more than 100 kilograms, and either crossfeed valve is open or balance system is ON
None
What happens when fuel is back in balance within 100 kilograms?
When fuel is back in balance within 100 kilograms and the crossfeed valve is open or the balance system is ON, FUEL BALANCED replaces FUEL QTY on the expanded fuel quantity display and flashes for 5 seconds.
None
True or False: A solid amber fuel imbalance pointer indicates that the FUEL IMBALANCE message is not displayed.
False
A solid amber pointer indicates that the FUEL IMBALANCE message is displayed.
What is the significance of the pointer flashing in the context of fuel balance?
The pointer flashes if fuel balance or crossfeed is going in the wrong direction.
None
Fill in the blank: The difference in fuel quantity which causes the FUEL IMBALANCE message to be displayed varies with total _______.
[main tank fuel quantity]
None
What does the fuel jettison indication display when ARMED?
The fuel quantity that leaves the airplane at maximum landing weight (MLW) when jettison is complete
This ensures the aircraft can land safely after fuel jettisoning.
What happens to the fuel temperature and static air temperature displays when fuel jettison is ARMED?
They are replaced by the fuel to remain display
This change is part of the fuel jettison system’s operational protocol.
What does the fuel to remain MAN (manual) selection indicate?
The fuel jettison system is ARMED and the FUEL TO REMAIN selector is pulled on
This allows the pilot to manually adjust the fuel quantity to remain.
How can the quantity of fuel to remain be changed?
By rotating the FUEL TO REMAIN selector
This provides flexibility in managing fuel levels during jettison.
How is the fuel synoptic display accessed?
By pushing the systems (SYS) display switch and selecting the FUEL synoptic key
Refer to Display Select Panel in Chapter 10, Section 10 for additional details.
What do the fuel flow bars indicate?
They represent a configuration of valve positions, switch positions, and pump status
Actual fuel flow is not sensed or displayed.
Is actual fuel flow sensed or displayed in the fuel system?
False
Fuel flow bars do not represent actual system operation.
What is the total fuel quantity displayed?
23.2 KGS X 1000
This figure represents the total fuel available for the aircraft.
What is indicated when the FUEL TO REMAIN selector is pulled on?
The fuel jettison system is ARMED
This action is crucial for initiating the jettison process.
Fill in the blank: The fuel jettison indications display the fuel quantity that leaves the airplane at _______.
maximum landing weight (MLW)
This is vital for ensuring safe landing conditions.
What type of information does the fuel synoptic display provide?
Information regarding fuel flow bars based on valve positions, switch positions, and pump status
It is essential for monitoring the fuel system’s configuration.
What does a white fuel valve symbol indicate?
Fuel valve is closed.
Indicates that the valve is not allowing fuel to flow.
What does a green fuel valve symbol indicate?
Fuel valve is in transit or open.
Green indicates either the valve is moving to an open position or is already open.
What does an amber fuel valve symbol with a crossout indicate?
Fuel valve is failed; commanded open but remains closed or commanded closed but remains open.
This indicates a malfunction in the valve operation.
What does a gray fuel valve symbol indicate?
Fuel valve state is invalid.
This suggests that the system cannot determine the status of the valve.
What is displayed in the Fuel Synoptic Display?
Fuel Synoptic Indications.
This display shows the operational status of the fuel valves.
What does the amber fuel valve symbol indicate when it is commanded open?
Valve is failed; remains closed.
This indicates an issue where the valve should be open but is not functioning correctly.
What does the amber fuel valve symbol indicate when it is commanded closed?
Valve is failed; remains open or in transit.
This indicates a malfunction where the valve should be closed but is not.
What does a white fuel valve symbol indicate?
Fuel valve is closed.
Indicates that the valve is not allowing fuel to flow.
What does a green fuel valve symbol indicate?
Fuel valve is in transit or open.
Green indicates either the valve is moving to an open position or is already open.
What does an amber fuel valve symbol with a crossout indicate?
Fuel valve is failed; commanded open but remains closed or commanded closed but remains open.
This indicates a malfunction in the valve operation.
What does a gray fuel valve symbol indicate?
Fuel valve state is invalid.
This suggests that the system cannot determine the status of the valve.
What is displayed in the Fuel Synoptic Display?
Fuel Synoptic Indications.
This display shows the operational status of the fuel valves.
What does the amber fuel valve symbol indicate when it is commanded open?
Valve is failed; remains closed.
This indicates an issue where the valve should be open but is not functioning correctly.
What does the amber fuel valve symbol indicate when it is commanded closed?
Valve is failed; remains open or in transit.
This indicates a malfunction where the valve should be closed but is not.
What indicates that the fuel pump switch is ON?
Fuel Pump (green rectangle)
This indicates that the fuel pump is actively engaged.
What does a fuel pump switch ON with a pressure sensor detecting pressure greater than 7 to 8 psig indicate?
Fuel Pump (green rectangle with line)
This indicates that the fuel pump is operating normally and providing sufficient pressure.
What does a white rectangle for the fuel pump indicate?
Fuel pump switch is OFF
This shows that the fuel pump is not operational.
What does the amber rectangle with a crossout signify for the fuel pump?
Fuel pump failed or pressure sensor detects pressure less than 7 to 8 psig
This indicates a critical failure or insufficient pressure.
What is indicated by a gray rectangle for the fuel pump?
Fuel pump state is invalid
This suggests that the system cannot determine the status of the fuel pump.
What does the green indication for Normal Fuel Feed represent?
Fuel line is pressurized; pressure sensor detects pressure greater than 7 to 8 psig
This indicates that fuel is being properly supplied to the system.