Fuel

Question 1

How many primary fuel tanks does the aircraft have?

Answer 1

• 2 integral tanks

i. Contains baffles, collector boxes, etc.

Question 2

Where is the fuel tank temperature taken?

Answer 2

Left tank

Question 3

What types of fuel pumps are in each wing?

Answer 3

• Primary Ejector Pump(s) – 1
• AC Fuel Pump(s) - 1
• Scavenge Ejector Pump(s) - 3
• DC Fuel Pump (right tank only)

Question 4

Describe a primary ejector pump and how it is powered?

Answer 4

• Venturi pump with no moving parts and no electrical power used by the
  respective engine.
• Powered by motive flow.

Question 5

What is the purpose of the AC fuel pump?

Answer 5

• Back-up Pump in case of Primary Ejector Pump failure
• Engine start
• Crossfeed operations

Question 6

What is the purpose of the DC fuel pump?

Answer 6

• Used for APU or Engine start if AC power or the AC Fuel Pump is not
  available.

Question 7

What is the purpose of the scavenge pumps?

Answer 7

• Maintains fuel level in the collector box.

Question 8

What pump(s) is used once an engine is started?

Answer 8

• Associated primary ejector pump.

Question 9

What is the purpose of the collector box?

Answer 9

• Keeps the fuel pumps submerged

- Ensures constant fuel flow to the respective engine.

Question 10

10.What is the surge/vent tank?

Answer 10

• Collects fuel during wing-down maneuvers and returns it to the main tanks
  once the wings are level.
• Equalizes tank pressure with atmosphere in flight and during refueling

Question 11

11.Can fuel be transferred from tank-to-tank or be dumped overboard?

Answer 11

• NO, only Crossfeed to an Engine (or APU)
  NOTE – when the crossfeed knob is selected to LOW 1 or LOW 2 the
  amount of fuel TO the lower side is higher than the actual fuel burn of the
  engine on that side, which causes fuel to be transferred from one tank to
  the other.

Question 12

12.What happens when the Crossfeed switch is selected to LOW 1?

Answer 12

• Crossfeed valve is opened.
• Commands the ACMP 2 to ‘ON’ to provide fuel from the right tank to both
  engines.

Question 13

13.What is the only way to close the engine fuel SOV?

Answer 13

• Pull the associated engine fire extinguishing handle.

Question 14

14.When will the FUEL 1(2) LO LEVEL EICAS be presented?

Answer 14

• 660 lbs of fuel remaining in the associated tank.