REVIEW QUESTIONS – FUEL

Question 1

1. What is the indication that the Nitrogen Generator System (NGS) is not operating?

Answer 1

-with either the INOPERATIVE (amber) light on or no lights on

Question 2

2. What does the LOW (amber) fuel alert indicate?

Answer 2

-Main Tank has less than 2000 lbs of fuel (for greater than 30 seconds)

Question 3

3. When does the CONFIG (amber) alert display on fuel quantity gauges?

Answer 3

Center Tank is greater than 1600 lbs, both CTR FUEL PUMP switches are off, and either engine is running

Question 4

4. What does the IMBAL (amber) alert mean?

Answer 4

-The difference between Main tank quantity is at least 1000 lbs for 60 seconds or longer. Extinguishes when they are less than 200 lbs different.

Question 5

5. Why is center tank fuel burned first, even though all fuel pumps are operating?

Answer 5

-Center tank fuel pumps have a much greater output pump pressure (23 psi vs 10 psi)

Question 6

6. Will the LOW PRESSURE light (amber) illuminate if a main tank FUEL PUMP switch is placed to OFF?

Answer 6

-Yes

Question 7

7. The Center Tank Fuel Pump switches are ON. What does a CTR PUMP LOW PRESSURE light (amber) indicate? Will the pump shut off?

Answer 7

-low fuel pressure downstream of the pump. Yes, after a continuous LOW PRESSURE signal of 15 seconds. Logic can be reset by placing the pump off and then back on.

Question 8

8. When do the Fuel Annunciator and MASTER CAUTION LIGHTS illuminate for a Center Tank Fuel Pump LOW PRESSURE light?

Answer 8

-after a 10 second continuous LOW PRESSURE signal

Question 9

9. What is the purpose of the Crossfeed valve?

Answer 9

-to allow one tank to feed both engines

Question 10

10. What does a Crossfeed VALVE OPEN light (bright blue) indicate?

Answer 10

-The valve is in transit or disagrees with the selector position

Question 11

11. What can suction feed from the No. 1 Main Tank? The No. 2 Main Tank?

Answer 11

-Each engine can suction feed from its own tank

Question 12

12. Where is the Fueling Receptacle?

Answer 12

-At the fueling station mid-point right wing, and provides a single point refueling

Question 13

13. What closes both the Spar Fuel Shutoff Valve and the Engine Fuel Shutoff Valve?

Answer 13

-Pulling the Fire Switch or Start Lever is placed to CUTOFF

Question 14

14. What does an ENG VALVE CLOSED (bright blue) light indicate? When would you expect to see it?

Answer 14

-The valve is in transit or valve position disagrees with Engine Start lever or Engine Fire Switch.
-During engine starts (moving Start Lever to idle) or during engine shutdown (Start Lever to CUTOFF or pulling the Fire Switch).