Fuel

Question 0

The NACA scoops are what?

Answer 0

The tanks are vented into atmosphere on the ground by two NACA scoop vents. In flight, the NACA scoops provide ram air pressure to the tanks.

Question 1

Where is the A/C fuel?

Answer 1

In the two main wing tanks and one center tank

Question 2

How are fuel system faults annunciated it?

Answer 2

Switch lights on overhead fuel panel

EICAS in form of messages

Question 3

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

Answer 3

Six fuel quantity probes with compensator units in each of the main tanks and three probes in center tank AND one per collector tank. Total 17

Question 4

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

Answer 4

By means of magnetic level indicators (MLI)

Question 5

What type of ejector pumps are used to move fuel from the main tanks to the collector tanks?

Answer 5

Scavenge ejectors

Question 6

What maintains fuel symmetry between the main tanks?

Answer 6

Automatically controlled by the Bi-directional X flow pump

Question 7

How are the collector tanks filled?

Answer 7

Gravity fed lines and scavenger ejectors

Question 8

What is used to back up the main ejectors and how many?

Answer 8

Two electric boost pumps

Question 9

The electric boost pumps do what ?…(3)

Answer 9

1. Are energized during engine starting
2. Can feed fuel to either engine from one collector tank
3. Back up the main ejector pumps

Question 10

From what sources is APU fuel feed supplied?

Answer 10

From the left collector tank via APU Fuel Pump.

Question 11

Where is the bulk fuel temperature taken?

Answer 11

Right main tank

Question 12

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

Answer 12

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

Question 13

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

Answer 13

FUEL IMBALANCE

Question 14

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

Answer 14

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

(Ref PRM 11 – 28)

Question 15

How many magnetic level indicators are there and where are they located?

Answer 15

5, 2 under each main tank and 1 under the center tank

Question 16

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

Answer 16

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

Question 17

What is the purpose of the fuel drain valves that are installed in the lowest point of each tank?

Answer 17

To permit gravity defueling.

Question 18

Explain how to check the lo fuel pressure annunciation for the boost pumps ?

Answer 18

Start left engine. Turn off both boost pumps. You’ll get fuel pres lo on right. Then turn on other engine.

When shutting down, turn off left engine and then turn off boost pumps. You should get a fuel pres lo on left side.

Question 19

If the center tank has more than 500 lbs ?

Answer 19

Each main tank must have more then 4400 lbs

Question 20

When will the fuel system automatically start to transfer fuel ?

Answer 20

Imbalance of 200lbs

Question 21

Minimum bulk fuel temperature for take off ?

Answer 21

-30* C