Chapter 6.120 - Fuel

Question 1

What fuel tank feeds first?

Why?

Answer 1

Center tank

Center tank pumps produce higher pressure than main tank pumps

Question 2

Where does remaining center tank fuel scavenge to?

When will this transfer begin?

Answer 2

To main tank number 1

When main tank number 1 quantity is about half

Question 3

Where is the fuel temperature gauge located?

What is the maximum and minimum fuel temperature?

Answer 3

In main tank number 1

Maximum is 49 degrees Celsius and minimum is -37 degrees Celsius

Question 4

Where does the APU fuel feed from?

Answer 4

• When AC pumps are operating, from the left side of the fuel manifold
• If the AC pumps are not operating, fuel is suction fed to APU from main tank number 1

Question 5

What does a bright blue valve light indicate on the fuel panel?

Answer 5

• Related valve is in transit, or

- Disagrees with commanded position

Question 6

What does the amber FILTER BYPASS light indicate?

Answer 6

Impending fuel filter bypass

Question 7

What condition must be met to get a FUEL annunciator light?

Answer 7

• Illumination of both amber LOW PRESSURE lights in any tank
• If one of the center tank pumps is turned off this qualifies as a LOW PRESSURE indication and the FUEL annunciator light will illuminate with a LOW PRESSURE indication from the remaining center tank pump

Question 8

What is a fuel limitation with regard to operating the electric hydraulic pumps on the ground?

Answer 8

Minimum of 1675 pounds in each wing tank to cool the case drain hydraulic fluid

Question 9

When will the amber IMBAL message appear on the fuel quantity indicators?

Answer 9

When the main tanks differ by more than 1,000 pounds