Fuel

Question 1

By what means are the tanks refueled?

Answer 1

Pressure Refueling & Gravity Refueling.

Question 2

How can the center tank be refueled?

Answer 2

By pressure refueling

Question 3

Where are the collector tanks located in the airfract?

Answer 3

In the center tank

Question 4

All fuel drawn from the fuel system comes from where?

Answer 4

the collector tanks

Question 5

What keeps the collector tanks full?

Answer 5

Scavenge ejector pumps

Question 6

Fuel tank venting is provided by what?

Answer 6

NACA vents

Question 7

Where are the NACA vents located on the aircraft?

Answer 7

Underside of the wings near the trailing edge.

Question 8

What is the purpose of the NACA vents?

Answer 8

Normal venting on the ground and in flight.
Provides positive head pressure to fuel tanks.

Question 9

Is it normal for the center tank to show an increase in quantity during a climb?

Answer 9

Yes, the fuel has entered the NACA vents & returned to the center tank.

Question 10

What prevents fuel from moving within the main tanks during low wing maneuvers?

Answer 10

One-way flow valves.

Question 11

If one cahnnel of the fuel computer fails, what will happen?

Answer 11

The other channel automatically takes control.

Question 12

How many different types of ejectors are within the fuel system?

Answer 12

3: Main ejectors, scavenge ejectors, & transfer ejectors.

Question 13

What is the purpose of the main ejectors?

Answer 13

To provide a positive head pressure to the engine-driven fuel pumps.

Question 14

What is the purpose of the transfer ejectors?

Answer 14

To move fuel from the center tank to wing tanks

Question 15

What is the purpose of the scavenge ejectors?

Answer 15

To move fuel from the wing tanks to the collector tanks.

Question 16

What is the primary purpose for the fuel boost pumps?

Answer 16

Provide fuel for engine start & a source of fuel pressure if the main ejector fails.

Question 17

What powers the fuel boost pumps?

Answer 17

DC power

Question 18

If only battery power is available, will the fuel boost pumps operate?

Answer 18

Only the left boost pump will be operational

Question 19

What occurs when both fuel boost pumps are selected in?

Answer 19

Arms the fuel pumps to operate when a decrease in pressure is detected.

Question 20

During engine start will both fuel pumps be working?

Answer 20

Yes, the running engine side boost pump is selected in.

Question 21

Are the fuel SOVs normally open or closed?

Answer 21

Open

Question 22

How may the fuel SOVs be closed to engines and APU?

Answer 22

Pressing either ENG FIRE or APU FIRE switch lights.

Question 23

How is the fuel heated within the fuel system?

Answer 23

Fuel/oil heat exchanger

Question 24

What will happen if the fuel filter becomes clogged?

Answer 24

L/R FUEL FILTER caution light illuminates & the bypass valve opens.

Question 25

Is the APU fuel pump DC or AC powered?

Answer 25

DC powered

Question 26

When does automatic fuel transfer occur from the center tank to the wings?

Answer 26

When the wing quantity reaches 93% transfer of fuel from the center to the wing tanks begins. The transfer stops when the wing tank is full.

Question 27

By what means is fuel crossflow provided?

Answer 27

Power Crossflow & Gravity Crossflow

Question 28

Power crossflow can be accomplished by what two means?

Answer 28

Automatic & Manual

Question 29

How is automatic powered crossflow between the main tanks achieved?

Answer 29

Automatically crossflows fuel when a 200lb fuel imbalance occurs

Question 30

How is the manual-powered crossflow between main tanks achieved?

Answer 30

Press the MAN XFLOW switch light & activate the crossflow pump on the low-tank side.

Question 31

At what times would you use the gravity crossflow method to balance the wing tanks?

Answer 31

If the powered crossflow system fails

Question 32

How is gravity crossflow of the main fuel tanks achieved?

Answer 32

-select the GRAVITY FLOW switch light to OPEN -when balanced manually close the crossflow valve

Question 33

What methods are provided for fuel quantity gauging?

Answer 33

-a digital display -magnetic level indicators (MLI)

Question 34

When will the digtial fuel quantity readout turn amber?

Answer 34

-total fuel quantity is <1200 lbs -fuel imbalance > 800 lbs

Question 35

When will the center tank fuel quantity indication be shown as white?

Answer 35

When the center tank quantity below 10lbs.

Question 36

Where is the bulk fuel temperature measured from?

Answer 36

The ring-wing tank

Question 37

When will the bulk fuel temperature readout be amber?

Answer 37

When the bulk fuel temperature is below -40C

Question 38

At what temperature will the fuel feed temperature indicated amber?

Answer 38

Fuel temperature is below 5C