Fuel

Question 1

How many integral wing tanks are there?

Answer 1

2

Question 2

How many tanks are in each integral wing tank and what is each section called?

Answer 2

2:
- collector tank
- surge tank

Question 3

What is the purpose of the collector tank?

Answer 3

Keeps the fuel pumps submerged thus ensuring constant fuel flow

Question 4

What is the purpose of the surge tank?

Answer 4

To collect any fuel that may enter the vent system during wing down and uncoordinated manoeuvres

Question 5

How many water drains valves are there?

Answer 5

One per tank

Question 6

How many magnetic level indicators are there?

Answer 6

3 per wing

Question 7

What is the capacity of each tank?

Answer 7

6550kg

Question 8

What fuel pumps does each integral tank contain?

Answer 8

1 ejector fuel pump
1 ac electric fuel pump
3 scavenge pumps
1 DC fuel pump (right wing only)

Question 9

How does the ejector fuel pump work?

Answer 9

Venturi effect

Question 10

What is the purpose of the AC electric fuel pumps?

Answer 10

Act as backup for the respective ejector pump

Question 11

What BUSSES are the AC electric pumps powered by?

Answer 11

AC pump 1 = AC BUS 1
AC pump 2 = AC ESS BUS

Question 12

What are the purpose of the scavenge pumps?

Answer 12

To maintain the fuel level in the collector tank

Question 13

What is the purpose of the DC fuel pump?

Answer 13

• Provides pressurised fuel for normal APU operation
• engine start when there is no AC power or the AC fuel pump is not working

Question 14

What happens when the cross feed selector knob is changed to LOW 1/2?

Answer 14

LOW 1 = cross feed valve opens and AC pump 2 activates
LOW 2 = cross feed valve opens and AC pump 1 activates

Question 15

When does a fuel imbalance message appear on the EICAS and when does this disappear?

Answer 15

Appears when fuel balance is over 360kg and disappears when it reduces to less than 45kg

Question 16

When do the fuel shutoff valves close?

Answer 16

When the fire handle is pulled