Fuel System

Question 1

Where is the fuel stored?

Answer 1

In the two main wing tanks and one center tank

Question 2

How are the fuel tanks normally vented?

Answer 2

Vented to the atmosphere via two NACA scoop vents located underneath the wing near the trailering edge between the flap segments

Question 3

How are fuel system faults annunciated?

Answer 3

• Switch lights on the overhead fuel panel
• On the EICAS in the form of messages

Question 4

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

Answer 4

• Six fuel quantity probes with compensator units in each of the main tanks
• Three probes in the center tank
• Aircraft Attitude information from the AHRS/IRS

Question 5

How may the fuel level be manually checked on the ground?

Answer 5

By means of magnetic level indicators( MLI)

Question 6

What happens if the active channel fails on the fuel computer system?

Answer 6

The fuel computer is dual channe, the redundant channel will take over

Question 7

What are the different types of Ejector Pumps?

Answer 7

• Transfer Ejectors
• Scavenge Ejectors
• Main Ejectors

Question 8

What type of Ejector Pump is used to move fuel from the main tanks to the collector tanks?

Answer 8

Scavenge Ejectors

Question 9

What type of ejector pump is used to move fuel from the center tank to the main wing tanks?

Answer 9

Transfer Ejectors

Question 10

What type of ejector transfers fuel from the collector tanks to the engines?

Answer 10

Main Ejectors

Question 11

What maintains fuel symmetry between the main tanks?

Answer 11

Automatically controlled by the Bi-directional X flow pump

Question 12

How are the collector tanks kept full?

Answer 12

Gravity feed lines and scavenge ejectors

Question 13

What is used to back up the main ejectors?

Answer 13

two electric boost pumps

Question 14

What are the electric boost pumps used for?

Answer 14

• During engine starting
• Can feed fuel to either engine from one collector tank
• backup the main ejector pumps

Question 15

From what source is the APU fuel feed supplied?

Answer 15

From the left collector tank via APU Fuel Pump

Question 16

Where is the bulk fuel temperature taken?

Answer 16

Right Main Tank

Question 17

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

Answer 17

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

Question 18

If a fuel asymetry condition exists between main tanks, what visual caution message is presented on EICAS?

Answer 18

FUEL IMBALANCE

Question 19

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

Answer 19

• Individual tank quantities
• Total fuel quantity
• Fuel flow per engine

Question 20

Where can you find the total amount of fuel used?

Answer 20

Fuel Synoptic Page

Question 21

In order to take off with more than 500 lbs of fuel in the center tank, how much fuel must be in each main wing tank?

Answer 21

Above 4400 lbs

Question 22

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

Answer 22

• Preselection of fuel quantity desired
• Built in test feature
• Refuel / defuel shut-off-valves to close automatically if the maximum fuel level is reached

Question 23

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

Answer 23

Engine flameout

Question 24

What is the maximum fuel imbalance?

Answer 24

1. 300 lbs for takeoff
2. 800 lbs for all other phases

Question 25

When will the fuel system automatically begin transferring fuel?

Answer 25

200 lbs fuel imbalance

Question 26

When are the boost pumps automatically energized?

Answer 26

Low pressure from the main ejectors (if the pumps are armed)

Question 27

Where is the high pressure fuel pump located?

Answer 27

N2 accessory gearbox

Question 28

What is the minimum engine fuel temperature for takeoff?

Answer 28

+5c

Question 29

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

Answer 29

-30c

Question 30

What is the Minimum bulk fuel temp during flight(Jet A)?

Answer 30

Above -40c

Question 31

How is engine fuel heated?

Answer 31

Fuel/Oil heat exchanger

Question 32

Which Bus powers the refuel/defuel panel and refuel/defuel SOV's?

Answer 32

DC Emergency Bus

Question 33

Where is the refuel/defuel panel located?

Answer 33

The fuselage forward of the right wing

Question 34

Where is the single point adapter located?

Answer 34

Right wing root

Question 35

What are the two methods to cross flow fuel?

Answer 35

1. Powered Cross Flow (Auto or manual) 2. Gravity Cross Flow

Question 36

What provides fuel tank ventilation when the airplane is in a nose up attitude?

Answer 36

Ventilation is provided by a climb vent

Question 37

During automatic fuel crossflow, when will the fuel transfer terminate?

Answer 37

When the wing that is receiving fuel is 50 lbs more than the other wing

Question 38

How many fuel filters are installed on the CRJ?

Answer 38

One per engine

Question 39

When will the EICAS fuel quantity indications be green?

Answer 39

When each wing tank has at least 600lbs, and the total fuel is greater than 1200lbs

Question 40

What switches control the APU fuel feed SOV?

Answer 40

* APU FIRE PUSH * PWR FUEL

Question 41

What switchlight controls the engine fuel feed SOV?

Answer 41

Left or Right ENG FIRE PUSH