Turbine Fuel Systems

Question 1

How many electric low pressure pumps per turbine fuel tank?

Answer 1

2

Question 2

Whats the middle wing fuel tank called?

Answer 2

Outer tank

Question 3

What valve allows for fuel to be moved from tank to tank?

Answer 3

Cross feed.

Question 4

A blank controller maintains the correct weight fuel to air ratio as altitude increases in a turbine engine system.

Answer 4

Barometric.

Question 5

LP booster pumps opporate at a pressure. The centre pump operates at x psi

Answer 5

50

Question 6

LP booster pumps opporate at a pressure. The feeder pump operates at x psi

Answer 6

30psi

Question 7

Why is the centre tank pumps at a higher pressure?

Answer 7

To prioritise fuel use from the centre tank first.

Question 8

When will centre tanks not work? When blank is activated.

Answer 8

When weight on wheels is activated.

Question 9

Are fuel booster pumps AC or DC?

Answer 9

AC

Question 10

Why do we use a squirrel cage rotor?

Answer 10

It doesn’t have an electrical supply so carnet form a spark

Question 11

The left inner fuel tank has un extra pump why?

Answer 11

To supply APU

Question 12

Assuming cross feed value is open and all pumps are running which pumps are running the APU?

Answer 12

Th central pump.

Question 13

Which fuel tank has an outward and inward valve?

Answer 13

Surge/vent (vent valve)

Question 14

What is a spar/fire valve?

Answer 14

Shut off valve for engines.

Question 15

What happens to thrust if a fuel pump fails?

Answer 15

It decreases.

Question 16

The jettison system should reach the maximum landing mass in x minutes

Answer 16

15 mins,

Question 17

When using magnetic-measuring-type dip sticks, the quantity of fuel in the aircraft is determined by using the measurements… from the blank blank and blank tables in the aircraft documentation.

Answer 17

Dip sticks and data tables

Question 18

Whilst performing an ordinary flight, the pilots notice a fuel imbalance, with the right wing tank holding more fuel than the left wing tank. The crew manage to confirm that there is no fuel leak causing the imbalance. Which of the following should the crew do to restore the aircraft balance? Open/close the cross-feed valve and shut off the left/right wing tank fuel pump(s).

Answer 18

Open the cross-feed valve and shut off the left wing tank fuel pump(s).

Question 19

Fuel tanks are fitted with baffles to… blank fuel spanwise flow.

Answer 19

Dampen.

Question 20

Failure of a capacitive fuel indication system will be indicated by…

Answer 20

Empty

Question 21

Some aircraft are equipped with fuel tanks for trimming purpose, where are these tanks usually positioned and what are they used for? In the forward/rear part of the aircraft, near the tail and used to regulate CG.

Answer 21

Rear

Question 22

Jet A has a flash point of + X8°C, and Jet B has a freezing point of - X0°C.

Answer 22

Jet A has a flash point of +38°C, and Jet B has a freezing point of -60°C.

Question 23

On most transport aeroplanes, the low pressure pumps of the fuel system are… hydraulically/electrically driven blank pumps.

Answer 23

electrically driven centrifugal pumps.

Question 24

Determine the main functions of the fuel system. Provision of fuel to the engines, appropriate blank to enable engine operation

Answer 24

Pressure

Question 25

Which type of electric power supplies the low pressure pumps of the fuel system on most transport jet aeroplanes? 28/115 V AC/DC

Answer 25

115 V AC

Question 26

Fuel pumps submerged in the fuel tanks of a large aeroplane are…blank high/low pressure type pumps.

Answer 26

centrifugal low pressure type pumps.

Question 27

The HP fuel pump is usually located between the Low-pressure fuel blank and the fuel control unit.

Answer 27

Filter

Question 28

What kind of fuel is wide-cut fuel, and has good cold air properties?

Answer 28

Jet B

Question 29

Jet A-1 has a freezing point of -4X°C, and a flash point of +3X°C.

Answer 29

47 - 38

Question 30

Consider a turbine engine aeroplane, with two underwing engines, fitted with two wing tanks and one centre tank. If all centre tank fuel booster pumps fail…Part or all of the fuel in the centre tank is considered blank.

Answer 30

Part or all of the fuel in the centre tank is considered unusable.

Question 31

Why are additives added to Jet A fuel?

Answer 31

To prevent the fuel from forming any ice within

Question 32

What is the density of JET-A1?

Answer 32

0.8

Question 33

What is the purpose of a feed box in the fuel tank? It increases the fuel level at the blank blank location.

Answer 33

It increases the fuel level at the boost pump location.

Question 34

The main purpose of the DC fuel pump in the left main tank is to… supply fuel to the blank.

Answer 34

APU

Question 35

The APU can receive fuel from the right/left/all/centre tank.

Answer 35

All

Question 36

One of the purposes of the fuel system booster pumps being submerged in fuel is to…

Answer 36

Cool the pumps.

Question 37

The engine fuel control unit (FCU) is protected from damage by debris by…the fine filter located between the high-pressure/low-pressure fuel pump and the blank unit.

Answer 37

High and governor

Question 38

Which of the following statements is/are correct?

1. The freezing point for Jet A is at a higher temperature than that for Jet B
2. The flash point for Jet A is at a higher temperature than that for Jet B

Answer 38

Both correct