Fuel Flashcards
How is fueling accomplished?
- From the Single Point Pressure fueling station in the right wing.
- Provided power by the hot battery bus.
What does an IMBAL alert on the Fuel Quantity Indicator indicate?
IMBAL: Main tank fuel quantities differ by 1000 pounds for greater than 60 seconds.
What does the LOW alert on the Fuel Quantity Indicator indicate?
LOW: Respective Main Tank fuel quantity is less than 2000 pounds for greater than 30 seconds.
What does a CONFIG alert on the Fuel Quantity Indicator indicate?
CONFIG: Center tank fuel quantity is greater than 1600 pounds, both Center Fuel Tank switches are OFF, either engine is running.
What does INSUFFICIENT FUEL on the Fuel Quantity Indicator indicate?
The FMC predicted fuel at the destination is less than 2000 pounds.
With all fuel pumps operating, what ensures center tank fuel is used before main tank fuel?
Greater differential pressure between center tank pumps and main tank pumps.
When do the Center tank fuel pumps shut off automatically?
Approximately 15 seconds after a continuous LOW-PRESSURE signal has been detected.
How is fuel provided to the engines without the fuel pumps?
When main tank fuel pump pressure is low, each engine can draw fuel from its corresponding Main Tank through a suction feed line that bypasses the pumps.
When does the center tank fuel scavenge jet pump activate?
Fuel quantity less than 4500 pounds in Main Tank 1. Continues for the remainder of the flight.
What is the purpose of the Cross-feed Valve?
- To provide cross-fed fuel to the operative engine during single engine operations, thereby maintaining fuel balance.
- To balance fuel during normal operations.
What does the engine start lever control?
- When the Engine Start Lever is placed to cutoff, the
o The engine fuel shutoff valve closes, and
o The spar fuel shutoff valve closes.
- When the Engine Start lever is placed to IDLE:
§ And the Engine Fire Switch is down,
· The Spar Fuel shutoff valve is commanded open.
· The Engine fuel shutoff valve is commanded open.
· Causes the EEC to supply fuel and ignition to the combustor section.
What does a bright blue illumination of the VAVLE OPEN on the Fuel Panel indicate?
- Valve position disagrees with its commanded position.
- Valve is in transition.
What does the dim illumination of an ENG VALVE CLOSED light indicate?
The ENG VALVE is closed.
What does a bright illumination of a SPAR VALVE CLOSED light indicate?
- The SPAR VALVE is not in its commanded position, or
- the SPAR VALVE is in transition.
Where could the APU suction feed fuel from?
Left main tank.
