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PPL Aircraft General > Landing Gear, Tyres and Brakes > Flashcards

Landing Gear, Tyres and Brakes Flashcards

1
Q

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

A

Free-castering

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2
Q

Free-castering refers to what?

A

Nosewheel not connected to rudder pedals

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3
Q

When does nosewheel shimmy occur?

A

Vibration during ground-roll

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4
Q

Main cause of nosewheel shimmy?

A

Failure of the torque link (shimmy damper)

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5
Q

For hydraulic fluid, what type of viscosity is preferred?

A

High viscosity

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6
Q
A
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7
Q

What component often connects a nosewheel with the fuselage?

A

Oleo-pneumatic unit

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8
Q

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

A

Telescopic

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9
Q

In an oleo-pneumatic unit, what is compressed?

A

Air

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10
Q

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

A

Damping agent

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11
Q

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

A

Oil

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12
Q

What component ensures nosewheel alignment with the airframe?

A

Torque-link

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13
Q

What function does a torque-link perform?

A

Aligns nosewheel with the airframe

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14
Q

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

A

It is hinged

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15
Q

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

A

Castor

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16
Q

Symptoms of too-high tyre pressures?

A

Vibration during taxiing
Uneven wear
Burst tyres

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17
Q

What exhibits these symptoms?

Vibration during taxiing
Uneven wear
Burst tyres

A

Too high tyre pressure

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18
Q

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

A

Damage to tyre structure
Tyre creep with respect to the rim

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19
Q

What exhibits these symptoms?

A

Too-low tyre pressure

20
Q

What do marks on tyres and rims help monitor?

A

Tyre creep

21
Q

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

A

Tyre creep

22
Q

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

A

Ply rating

23
Q

Ply rating is the measurement of what?

A

Tyre strength

24
Q

What does the rubber tread provide in a tyre?

A

A wearing surface between the tyre and runway

25
Q

What provides a wearing surface between tyre and runway?

A

Rubber tread

26
Q

A hydraulic system requires what kind of fluid?

A

Incompressible

27
Q

Hydraulic systems rely on what theoretical law?

A

Pascal’s Law

28
Q

What does Pascal’s Law necessitate?

A

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

29
Q

What does a selector valve do in a hydraulic system?

A

Controls direction of flow

30
Q

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

A

Selector valve

31
Q

In a hydraulic system, what relieves excess pressure?

A

Relief valve

32
Q

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

A

Relieves excess pressure

33
Q

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

A

Double-acting

34
Q

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

A

Servo

35
Q

Mineral-based hydraulic fluids are dyed what colour?

A

Red

36
Q

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

A

Corrosion

37
Q

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

A

Phosphate esters

38
Q

Phosphate esters are dyed what colour?

A

Purple

39
Q

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

A

They have good fire-resistant properties

40
Q

What are fitted to main wheels for braking?

A

Disc brakes

41
Q

A typical braking system contains hydraulic fluid where?

A

Master cylinder

42
Q

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

A

Contains hydraulic fluid

43
Q

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

A

Slave cylinder

44
Q

Applying toe brake in a braking system performs what operation?

A

Pressure is transmitted from the master cylinder to a slave cylinder

45
Q

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

A

Brake pads

46
Q

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

A

Dry Powder

PPL Aircraft General (4 decks)

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