Fuel Systems

Question 1

How tight should a flareless fitting be turned after being finger tightened?

Answer 1

No more than one sixth to one third

Question 2

What time frame is used to classify the size of a leak?

Answer 2

30 mins

Question 3

What happens if filters are blocked with ice?

Answer 3

Illuminate a light,
Fuel will heat up melting ice,
Compressor bleed air can be used

Question 4

Name 3 types of fuel tanks

Answer 4

Integral
Auxiliary
Flexible (Bladder)

Question 5

What type of tank is made to be fitted or removed?

Answer 5

Auxiliary fuel tanks

Question 6

What are bladder tanks usually made of and how are they held in place?

Answer 6

Neoprene rubber,

Can snap or click into place or can be laced into the structure.

Question 7

What must tank caps have attached to them?

Answer 7

Locking device and chain to ensure cap isn’t left unattached.

Question 8

Define ventilation

Answer 8

When aircraft is refuelled or de fuelled a positive pressure or vacuum is created. Vent system is used to prevent this.

Question 9

Apart from refuelling and defuelling when else will fuel tanks require a vent system?

Answer 9

When transferring fuel to another tank.

Thermal expansion.

Question 10

What do fuel tanks have to check quality of fuel on the ground?

Answer 10

Fuel tank drain points

Question 11

Name 3 fuel quantity indication systems

Answer 11

Float type
Capacitance type
Measuring stick

Question 12

What can aircraft do to reduce weight inflight Incase of emergency.

Answer 12

Dump fuel,

Jettison fuel

Question 13

Fuel shut off valves are operated by what

Answer 13

Solenoid

Question 14

What type of fuel quantity indicator can tell us the mass of fuel?

Answer 14

Capacitance

Question 15

What is the most common type of coupling found on NZDF aircraft

Answer 15

Wiggins Coupling

Question 16

What fuel tank consists of part of the aircraft structure.

Answer 16

Integral

Question 17

All fuel tank systems should contain a drain to perform what function?

Answer 17

Fuel drain, fuel quality checks

Question 18

What happens when a fuel filter gets clogged?

Answer 18

Warning light to indicate clogging, bypass

Question 19

What are the 4 classifications of a leak.

Answer 19

Slow seep (stain)
Seep
Heavy seep
Running leak

Question 20

How can you identify if a flexible hose has been twisted?

Answer 20

Lay line will be twisted

Question 21

Define volatility

Answer 21

The measure of a liquids tendency to vaporise under certain conditions.

Question 22

What three operations are electric boost pumps used for?

Answer 22

Supply fuel pressure for starting engine.
Back up Incase engine driven pump fails.
Assures fuel flow switching from one tank to another.

Question 23

What is built around a fuel pump to prevent movement of fuel away from booster pump

Answer 23

Surge box

Baffles

Question 24

What is an integral fuel tank defined as.

Answer 24

Primary aircraft structure, usually a aircraft wing or fuselage, sealed to contain fuel.

Question 25

Two forms of water in fuel.

Answer 25

Dissolved and free

Question 26

In centrifugal boost pumps what stirs up the fuel drawn into the impellers

Answer 26

Agitator, allows big air bubble to go to surface

Question 27

Contaminated fuels greatest danger

Answer 27

Contamination resulting from human error.