Landing Gear, Tyres and Brakes

Question 1

What system refers to a nosewheel not connected to rudder pedals and free to move on its own?

Answer 1

Free-castering

Question 2

Free-castering refers to what?

Answer 2

Nosewheel not connected to rudder pedals

Question 3

When does nosewheel shimmy occur?

Answer 3

Vibration during ground-roll

Question 4

Main cause of nosewheel shimmy?

Answer 4

Failure of the torque link (shimmy damper)

Question 5

For hydraulic fluid, what type of viscosity is preferred?

Answer 5

High viscosity

Question 7

What component often connects a nosewheel with the fuselage?

Answer 7

Oleo-pneumatic unit

Question 8

An oleo-pneumatic unit is of what kind of construction?

Answer 8

Telescopic

Question 9

In an oleo-pneumatic unit, what is compressed?

Answer 9

Air

Question 10

Special oil is used as what in an oleo-pneumatic unit?

Answer 10

Damping agent

Question 11

What is used as a damping agent in an oleo-pneumatic unit?

Answer 11

Oil

Question 12

What component ensures nosewheel alignment with the airframe?

Answer 12

Torque-link

Question 13

What function does a torque-link perform?

Answer 13

Aligns nosewheel with the airframe

Question 14

How does a torque-link allow the oleo-pneumatic unit to move?

Answer 14

It is hinged

Question 15

What term is used for wheels that are uncontrolled by the pilot?

Answer 15

Castor

Question 16

Symptoms of too-high tyre pressures?

Answer 16

Vibration during taxiing
Uneven wear
Burst tyres

Question 17

What exhibits these symptoms?

Vibration during taxiing
Uneven wear
Burst tyres

Answer 17

Too high tyre pressure

Question 18

What are the symptoms of tyres with too-low pressure?

Answer 18

Damage to tyre structure
Tyre creep with respect to the rim

Question 19

What exhibits these symptoms?

Answer 19

Too-low tyre pressure

Question 20

What do marks on tyres and rims help monitor?

Answer 20

Tyre creep

Question 21

What occurs when tyres drag in rotation with respect to their metal rim?

Answer 21

Tyre creep

Question 22

What is the measurement of a tyre’s supposed strength?

Answer 22

Ply rating

Question 23

Ply rating is the measurement of what?

Answer 23

Tyre strength

Question 24

What does the rubber tread provide in a tyre?

Answer 24

A wearing surface between the tyre and runway

Question 25

What provides a wearing surface between tyre and runway?

Answer 25

Rubber tread

Question 26

A hydraulic system requires what kind of fluid?

Answer 26

Incompressible

Question 27

Hydraulic systems rely on what theoretical law?

Answer 27

Pascal’s Law

Question 28

What does Pascal’s Law necessitate?

Answer 28

A change in pressure at any point must be transmitted so that the pressure change occurs equally everywhere

Question 29

What does a selector valve do in a hydraulic system?

Answer 29

Controls direction of flow

Question 30

In a hydraulic system, what controls the direction of flow?

Answer 30

Selector valve

Question 31

In a hydraulic system, what relieves excess pressure?

Answer 31

Relief valve

Question 32

In a hydraulic system, what does a relief valve do?

Answer 32

Relieves excess pressure

Question 33

What term is given to a servo that can have fluid applied to both sides?

Answer 33

Double-acting

Question 34

In a hydraulic system, what component turns fluid power into work?

Answer 34

Servo

Question 35

Mineral-based hydraulic fluids are dyed what colour?

Answer 35

Red

Question 36

What can occur with hydraulic mineral-based fluids that don’t have hoses or seals?

Answer 36

Corrosion

Question 37

What kind of hydraulic fluids are used for high landing speeds?

Answer 37

Phosphate esters

Question 38

Phosphate esters are dyed what colour?

Answer 38

Purple

Question 39

Why are phosphate esters used for aircraft with high landing speeds?

Answer 39

They have good fire-resistant properties

Question 40

What are fitted to main wheels for braking?

Answer 40

Disc brakes

Question 41

A typical braking system contains hydraulic fluid where?

Answer 41

Master cylinder

Question 42

What does a master cylinder do in a typical braking system?

Answer 42

Contains hydraulic fluid

Question 43

In a typical braking system, what closes the brake friction pads onto the brake disc?

Answer 43

Slave cylinder

Question 44

Applying toe brake in a braking system performs what operation?

Answer 44

Pressure is transmitted from the master cylinder to a slave cylinder

Question 45

In a braking system, what does the slave cylinder close when operated?

Answer 45

Brake pads

Question 46

What fire extinguisher should be used in the event of a tyre fire?

Answer 46

Dry Powder