Fuel

Question 1

How are the outboard tanks structured?

Answer 1

divided into 3 sections by baffles

Question 2

What do the main tank surge boxes do? Where is it located?

Answer 2

prevents fuel boost pumps from becoming fuel starved during nose-down, wing-down, or negative-g attitudes by keeping the boost pumps submerged in fuel Inboard aft corner of each main tank

Question 3

How many transfer pumps are in the aux tanks?

Answer 3

1

Question 4

How many transfer pumps are in the external tanks?

Answer 4

2

Question 5

What is the purpose of the fuel tank vent system?

Answer 5

vents all fuel tanks to the atmosphere to equalize pressure and prevent damage to the wing or tank

Question 6

What kind of vent system do the inboard and aux tanks have?

Answer 6

wrap-around vent system

Question 7

How are the outboard tanks vented?

Answer 7

vented by float-controlled vent valves

Question 8

How are the external tanks vented?

Answer 8

vented through the space at the top of the baffles, separating the tank compartments, and through the fuel vent line

Question 9

What do FLCVs do?

Answer 9

automatically stops fuel from flowing into the tank when its full

Question 10

How many FLCVs are in each tank?

Answer 10

3 in 1 and 4 1 in all the others

Question 11

If the FLCVs lose electrical power, what position do they fail in?

Answer 11

spring-loaded closed

Question 12

What is the boost pump rated at?

Answer 12

15 to 24 psi

Question 13

What is the transfer pump rated at?

Answer 13

28 to 40 psi

Question 14

Do both transfer pumps in the external tank run at the same time?

Answer 14

No they alternate. They only run at the same time during fuel dumping

Question 15

The compensators in the fuel tanks measure what to get a more accurate fuel level reading?

Answer 15

density of the fuel, not the quantity

Question 16

What monitors and controls the basic aircraft fuel system?

Answer 16

the dual channel Fuel Management Controller (FMC)

Question 17

What buttons in the cockpit control the FLCVs? The transfer pumps?

Answer 17

TO button FROM button

Question 18

What turns on the boost pumps?

Answer 18

selecting the ENGINE START switch to RUN

Question 19

In case of power failure, the fuel valves fail to what position?

Answer 19

hold the last energized position

Question 20

The dump valve switches control which valves?

Answer 20

dump mast shutoff valves interconnect valves

Question 21

If the AR pumps are being used for dumping, what do the interconnect valves do and why?

Answer 21

Remain close or close upon activation to prevent high pressure fuel from entering the cross-ship manifold

Question 22

Where is fuel returned to from the SPR manifold?

Answer 22

Tank 3

Question 23

Placing the SPR DRAIN switch to ON does what?

Answer 23

opens the drain valve, closes the SPR valve, and activates the drain pump to initiate the drain cycle.

Question 24

How long does the fuel drain cycle run? How many cycles are required to completely drain the SPR manifold?

Answer 24

2.5 mins 2

Question 25

What do the interconnect valves do?

Answer 25

Isolates the AR manifold and the cross-ship manifold during AR

Question 26

Why do we not want to land with fuel in the externals?

Answer 26

to prevent pylon fatigue cracking

Question 27

Fuel Weight Tanks 1 and 4

Answer 27

8310

Question 28

Fuel Weight Tanks 2 and 3

Answer 28

7650

Question 29

Fuel Weight Aux Tanks

Answer 29

5810

Question 30

Fuel Weight External Tanks

Answer 30

8900

Question 31

Fuel Weight Fuselage Tanks

Answer 31

24390

Question 32

How much fuel can be dumped?

Answer 32

All usable except approx. 1520 lbs in each main tank

Question 33

Dump rate with 4 transfer pumps

Answer 33

2000 lbs/min

Question 34

Dump rate with 6 transfer pumps

Answer 34

2770 lbs/min

Question 35

Dump rate with 8 transfer pumps

Answer 35

2950 lbs/min

Question 36

Dump rate with 10 transfer pumps

Answer 36

3900 lbs/min

Question 37

Dump rate with 2 AR pumps

Answer 37

5440 lbs/min

Question 38

How is dumping prevented on the ground?

Answer 38

WOW system

Question 39

How do you dump fuel if you’re using a fuselage tank?

Answer 39

Fuselage tank fuel is dumped by the AR pumps, fuel from the other tanks may not be dumped directly overboard but may be transferred simultaneously into the fuselage tank.

Question 40

In case of power failure, what do the crossfeed valves do?

Answer 40

hold last energized position

Question 41

The fuel pressure indicator is located where on the FUEL MANAGEMENT panel?

Answer 41

right side of the cross ship manifold

Question 42

How do you display fuel pressure from the left side of the cross ship manifold?

Answer 42

the cross ship valve OR both interconnect valves must be open

Question 43

What type of material is used in the fabrication of the cross-ship manifold and why?

Answer 43

Inconel low thermal expansion property

Question 44

What do the FLCVs require to open? What are they controlled by?

Answer 44

electrical power FMC

Question 45

If the primary FMC fails followed by a failure of the secondary FMC, what is displayed?

Answer 45

the fuel tank quantity indicators on the flight station overhead FUEL MANAGEMENT panel will display dashes while the quantity indicators at the ACS FUEL MANAGEMENT panel will display the last valid values.

Question 46

What type of tanks are the aux tanks?

Answer 46

Bladder type

Question 47

Why are the external tanks compartmented with baffles?

Answer 47

to prevent surges between compartments that would affect CG

Question 48

What does the main tank water removal system do?

Answer 48

provides continuous water removal from the tank low points during boost pump operation maintains the fuel level around the boost pump when the aircraft is in a nose-down attitude with low fuel level in the tank