Fuel Systems

Question 1

How many fuel tanks does the airplane have?

Answer 1

2 integral tanks

Question 2

Where is fuel tank temperature taken?

Answer 2

Left tank

Question 3

What types of fuel pumps are in each wing?

Answer 3

• Primary ejector pump
• ACMP
• DCMP right tank
• 3 scavenge ejector pumps

Question 4

What is the primary ejector pump?

Answer 4

Venturi pump

• No moving parts
• No electrical power used by onside engine
• Powered by motive flow

Question 5

What is the purpose of the ACMP?

Answer 5

• Backup pump in case of primary ejector failure
• Engine start
• Crossfeed operations

Question 6

What is the purpose of the DCMP?

Answer 6

Used for APU or engine start if AC power or the ACMP is not available

Question 7

What is the purpose of the scavenge pumps?

Answer 7

Maintains fuel in the collector box

Question 8

What pumps are used once the engine starts?

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

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

Can fuel be transferred from tank to tank

or be dumped overboard?

Answer 11

No

Question 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

What is the only way to close the engine shutoff valve?

Answer 13

Pull the associated engine fire extinguishing handle

Question 14

When will the “FUEL 1 (2) LO LEVEL”

EICAS message be presented?

Answer 14

660 lb of fuel remaining in the associated tank

Question 15

What is the Minimum Fuel Temperature?

Answer 15

• 40 degrees C

Question 16

What is the Maximum Fuel Imbalance?

Answer 16

794 lbs.

Question 17

What is the TOTAL Maximum Fuel Capacity?

Answer 17

20,935 lbs.

Question 18

What is the Unusable Quantity per tank?

Answer 18

75 lbs. / 11 US gallons per tank

Question 19

What powers the Refuel/Defueling panel before engine start?

Answer 19

DC Hot BATT Bus 2

Question 20

How many fuel pumps exsist?

Answer 20

13 pumps total

Question 21

Name the 13 pumps of the Fuel System

Answer 21

2 Engine Driven Pumps

2 Primary (Main) Ejector Pumps

6 Scavenge Ejector Pumps (3 on each side)

2 AC Electric Pumps

1 DC Electric Pumps

Question 22

How many Electric Pumps are apart of the Fuel System?

Answer 22

3 Electric Fuel Pumps Total:

2 ACMP

1 DCMP

Question 23

How many “Ejector” pumps are there in the Fuel System?

Name them, please.

Answer 23

8 Ejector Pumps:

2 Primary Ejector Pumps (Located in the Collector tanks)

6 Scavenge Ejector Pumps (3 in each tank)

Question 24

What backs up the Ejector Pumps?

Answer 24

AC Fuel Pumps

Question 25

Which pump provides fuel to the APU when the EDP is not running?

Answer 25

ACMP 2

Question 26

When do the ACMPs automatically turn Off after landing?

Answer 26

Speed less than 50kts

+60 seconds

Question 27

When will ACMP 1 and 2 automatically activate?

Answer 27

Ground: Flaps > 0 AND

TL set to T/O …. or …. Ground speed > 50 kts

Flight: Engine/EDP failure

Flaps > 0