FUEL

Question 1

1. A fuel pointer appears next to the low tank quantity in the expanded format. What does a solid white pointer indicate?

Answer 1

1.
Fuel imbalance is greater than 1000 pounds.
Fuel imbalance is greater than 200 pounds with a crossed valve open.

Question 2

2. On the ground, with only a single source of electrical power, which fuel pumps can operate?

Answer 2

2. Left FWD and AFT
   Right FWD and AFT
   On the ground with only one power source available and the center fuel pump switches on, only one pump can operate.

Question 3

3. When the FUEL LOW CENTER EICAS message displays with the center fuel tank ON, the center fuel tank will have less than 2400 pounds of fuel (400 pounds 200A) remaining. What happens to the remaining fuel?

Answer 3

3. The center tank scavenge system transfers any remaining fuel to the main tanks whenever the main tank pumps are ON and the fuel quantity in either main tank is less than 29,000 pounds B/C, (20,000 pounds 200A, 52,600 pounds 322)

Question 4

4. When main tank fuel pressure is low (dual pump failure) how is fuel supplied to the engine? How would failure of both center tank pumps affect fuel use?

Answer 4

4.
The main tank fuel would suction feed.
Center tank fuel would be unusable because center tank fuel cannot suction feed.

Question 5

5. What is the source of fuel to the APU?

Answer 5

5.
Any AC pump supplying fuel to the left fuel manifold.
DC fuel pump in the left main tank if AC power is unavailable
With AC power available, the left forward fuel pump operates automatically regardless of switch position.

Question 6

6. What happens in the fuel system when the TO REMAIN fuel value is reached during fuel jettison?

Answer 6

6. Jettison automatically stops at a value just above the TO REMAIN quantity. The system shuts off the main tank jettison pumps and closes the center tank jettison isolation valves.

Question 7

7. (200B/C/322) What happens during the fuel jettison when the airplane is heavy and loaded near the forward CG limit?

Answer 7

7.
Fuel is jettisoned from the center tank first to keep CG in limits.
Main tank jettison is delayed.
Computer jettison time is automatically adjusted to reflect increased jettison time.

Question 8

8. Normal fuel quantity is indicated by a Total Fuel indicator on the upper EICAS screen. What causes the Total Fuel to reconfigure to the expanded format?

Answer 8

8.
One or both crossed valves open.
One or more fuel tank quantity indicators are inoperative.
FUEL IN CENTER alert message is displayed (center tank quantity amber).
FUEL QTY LOW alert message is displayed (low main tank quantity amber).
FUEL IMBALANCE alet message is displayed.
Aircraft is on the ground and one or both engines are off.
FUEL FLOW ENG L/R alert message is displayed (AIMS BP-16 or later software).

Question 9

9. Center Fuel Pump Press lights are inhibited when the switches are OFF. When the switches are ON, what do the lights indicate?

Answer 9

9. Pump output pressure is low.