SYS - Fuel System

Question 1

How many integral fuel tanks?

Answer 1

3

Question 2

How much usable fuel?

Answer 2

1100lbs - when using the primary refuel method

Question 3

Two ways of refuelling?

Answer 3

• pressure refuelling - single point adapter

- gravity fill - ports in each outer wing

Question 4

Generically how is fuel fed to the engine?

Answer 4

Motive flow system - siphoning effect

Question 5

Number and name of pumps for normal operation?

Answer 5

Engine driven low and high pressure pumps

Question 6

What is electric boost pump for?

Answer 6

Engine starting

Question 7

What supplies fuel during negative g?

Answer 7

A fuel pick up valve in the central collector tank

Question 8

Is the fuel balancing automatic?

Answer 8

Yes

Question 9

Name of fuel tanks?

Answer 9

Left wing
Collector
Right wing

Question 10

Max fuel from overwing refuelling?

Answer 10

1200lbs

Question 11

When primary refuelling how is fuel distributed (in lbs) between the three tanks?

Answer 11

Left and right = 530lbs

Collector tank = 40 lbs

Question 12

Where is single point refuelling location?

Answer 12

Left side of fuselage just in front of the wing

Question 13

How long does it take to refuel using pressure refuelling?

Answer 13

3-5 min

Question 14

How does refuelling automatically shut off?

Answer 14

Level control pilot valves at each outboard wing closes the level control shut off valves when fuel reaches them

Question 15

How much more in each wing can you get from overwing refuelling?

Answer 15

Extra 50lbs

Question 16

Where is the manifold valve?

Answer 16

At the front of the collector tank

Question 17

Does the fuel filter have a bypass?

Answer 17

Yes

Question 18

How many fuel shutoff valves and how operated?

Answer 18

Two, firewall shutoff operated by the firewall shut off handle. Maintenance shut off valve.

Question 19

Is the fuel flow transmitter downstream or upstream of the FMU?

Answer 19

Downstream

Question 20

Where does excess fuel not used by the engine go?

Answer 20

Through a purge line back to the collector tank

Question 21

What drives the primary and transfer jet pumps?

Answer 21

Fuel from the low pressure pump sent down the motive flow line

Question 22

When is the electric boost pump activated? (2)

Answer 22

• below 10psi in the motive flow line

- and, PCL is in start Ready position

Question 23

Primary jet pump takes fuel from where to where?

Answer 23

From collector tank to low pressure pump

Question 24

Transfer jet pumps take fuel from where to where?

Answer 24

Wing tanks to collector tanks

Question 25

Inverted flight should be limited to ______ seconds.

Answer 25

15

Question 26

How many fuel level probes and in which tanks?

Answer 26

7. | 3 in each wing and 1 in the collector tank

Question 27

What does the fuel probe in the collector tank measure other than level?

Answer 27

Temperature compensation and fuel density

Question 28

How is fuel in the collector tank displayed on EICAS?

Answer 28

It is split between the two main wing tank indications

Question 29

When do fuel tapes turn yellow?

Answer 29

150lbs in respective tank

Question 30

When does respective L or R FUEL LO EICAS messages appear?

Answer 30

110lbs in a tank

Question 31

FP FAIL means?

Answer 31

There is a fuel probe failure

Question 32

FUEL PX (red)

Answer 32

Less than 10PSI in the motive flow line

Question 33

M FUEL BAL (green)

Answer 33

Anytime fuel balance switch is not in auto

Question 34

FUEL BAL

Answer 34

30 lbs imbalance for more than 2 min and auto system not corrected it. Also lights if fuel probe fails. Remains illuminated until fuel system is reset.

Question 35

BOOST PUMP (green) means? (One of three things)

Answer 35

- boost pump switch is on - auto operation by low pressure switch - whenever starter is activated

Question 36

When does boost pump come on when switch is armed?

Answer 36

During start until 10PSI

Question 37

When can the boost pump be switch be turned to on?

Answer 37

Failure of the engine driven low pressure fuel pump

Question 38

How are tanks vented externally? (2)

Answer 38

- pressure relief valve | - vacuum relief valve

Question 39

How are tanks vented internally to each other?

Answer 39

Cross vent line

Question 40

What does float valve in each wing tip do?

Answer 40

Prevents fuel from overfilling low tank when on a slope

Question 41

What does FUEL balance system try and maintain balance to within?

Answer 41

20lbs between tanks

Question 42

When does fuel balancing start?

Answer 42

More than 20lbs for greater than 30sec

Question 43

If an imbalance greater than 30lbs for 2 minutes is experienced does the AUTO balancing system shut off?

Answer 43

Yes

Question 44

If the AUTO balance system has shut off but still an imbalance of more than 30lbs how balance with AUTO system?

Answer 44

A reset will give another two minutes of balancing, may need to reset multiple times.