Fuel System

Question 1

What are the fuel quantities for pressure refueling?

Answer 1

700, 900, 900EP:
Total: 19,594 lbs
Mains: 7,492 lbs
Center: 4,610 lbs

Question 2

What are the fuel quantities for gravity refueling (900 and 900EP)?

Answer 2

Total: 14,810 lbs
Mains: 7,405 lbs
Center: N/A

Question 3

What are the fuel quantities for gravity refueling (700)?

Answer 3

Total: 14,580 lbs
Mains: 7,290 lbs
Center: N/A

Question 4

How is the fuel moved from the main tanks to the collector tanks?

Answer 4

Scavenge ejectors

Gravity line used as a backup

Question 5

How is the fuel moved from the center tank to the main tanks?

Answer 5

Transfer ejectors

Question 6

How is fuel moved from the collector tanks to the engine driven high pressure fuel pump?

Answer 6

Main ejectors

Backed up by boost pumps

Question 7

What is the function of the electric boost pumps?

Answer 7

To provide initial fuel for engine start and to back-up the main ejectors

Question 8

What is the flight deck indication of a high pressure fuel pump failure?

Answer 8

Engine flameout

Question 9

When will the fuel system automatically begin transferring fuel?

Answer 9

200 lb fuel imbalance

Question 10

What is the maximum fuel imbalance?

Answer 10

300 lb for takeoff

800 lbs for all other phases

Question 11

When are the boost pump automatically energized?

Answer 11

Low pressure from the main ejectors (as long as the boost pumps are armed)

Question 12

Where is the high pressure fuel pump located?

Answer 12

N2 accessory gearbox

Question 13

Where is the bulk fuel temperature taken?

Answer 13

Right Main Tank

Question 14

What is the Minimum Bulk Fuel Temperature for take-off (Jet A)?

Answer 14

-30º C

Question 15

What is the minimum bulk fuel temperature during flight (Jet A)?

Answer 15

above -40º C

Question 16

How is engine fuel heated?

Answer 16

Fuel/oil heat exchanger

Question 17

What is the minimum engine fuel temperature for takeoff?

Answer 17

+5º C

Question 18

What is the takeoff limitation if the center tank has more than 500 lbs of fuel?

Answer 18

Each main tank must have at least 4400 lbs of fuel

Question 19

Which Bus powers the refuel/defuel panel and refuel/defuel SOVs?

Answer 19

APU direct battery bus

Question 20

Where is the refuel/defuel panel located?

Answer 20

The fuselage forward of the right wing

Question 21

Where is the singe point adapter located?

Answer 21

Right Wing Root

Question 22

How are the fuel system faults annunciated?

Answer 22

The switch lights on the overhead panel and on EICAS in the form of messages

Question 23

What is used to provide the fuel computer with fuel quantity information?

Answer 23

6 fuel quantity probes with compensator units in each of the main tanks and 3 in the center

Question 24

What maintains fuel symmetry between the main tanks?

Answer 24

Automatically or manually controlled by the XFLOW pump

Question 25

How are the collector tanks kept full?

Answer 25

Gravity feed lines and scavenge ejectors

Question 26

What is used to back up the main ejectors?

Answer 26

2 electric boost pumps

Question 27

The electric fuel boost pumps...

Answer 27

1) are energized during engine start 2) can feed fuel to either engine from 1 collector tank 3) back up the main ejector pumps

Question 28

From what source is APU fuel feed supplied?

Answer 28

From the left collector tank via APU fuel pump

Question 29

Where is the bulk fuel temp taken?

Answer 29

Right main tank

Question 30

How is pressure refueling and suction defueling accomplished and how is it controlled?

Answer 30

Accomplished through the single point refuel/defuel adapter. Controlled from the refuel/defuel control panel

Question 31

If a fuel asymmetry condition exists between main tanks, what visual amber CAUTION message is presented on EICAS?

Answer 31

FUEL IMBALANCE

Question 32

What fuel system information is displayed on the EICAS Primary page?

Answer 32

Individual tank quantities, total fuel quantity, fuel flow per engine

Question 33

For automatic pressure refueling, what does the refuel/defuel control panel permit?

Answer 33

Preselection of the fuel quantity Built in test feature (BITE) Refuel/defuel SOV's to close automatically if the maximum fuel level is reached