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WTLG > Everything SuprisešŸ˜‰ > Flashcards

Everything SuprisešŸ˜‰ Flashcards

1
Q

Define overcentering

A

A style of locking out, when the arm goes into hyper extension. This is found of the drag and jury arms

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2
Q

2 common hubs in RNZAF

A

Loose flange

Divided

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3
Q

What are drive blocks

A

What the rotor discā€™s slide/key into on a wheel hub so they turn with the wheel Assy.

Also known as steel keys

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4
Q

Whatā€™s the purpose of a fusible plug

A

When a wheel over heats in landing. The plug will melt and let a control rate of air escape rather than have the wheel rupture

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5
Q

Valve core found in rnzaf

A

Schradder

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6
Q

Explain chined

A

Chined is A sidewall design on a Tyre that deflects water away from engines and the aircraft frame

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7
Q

Trunnion

A

Pin/ pivot that the strut attaches to the frame

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8
Q

Explain anti shimmy

A

Anti shimmy is a type of wheel design which creates two points of contact with the ground to stabilize the wheel.
Found on single nose wheels and castered wheels

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9
Q

Slippage mark is also known as

A

Creep mark

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10
Q

What effect does aqua planning has

A

It causes water to boil. The wheel doesnā€™t rotate and the rubber bubbles and melts creating a damaged patch on the wheel

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11
Q

Explain Mutlipot

A

A brake caliper unit with multiple pistons

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12
Q

What is retraction

A

Is the movement of bring the landing gear into the aircraft to make it more streamline

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13
Q

3 types of main landing gear styles

A

Tandem
Tricycle
Conventional

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14
Q

Purpose of a scissor link

A

To hold alignment of a strut and stop the oleo from extending too farā€¦ eg. Dropping out

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15
Q

Drag strut

A

Prevents collapse of landing gear when weight applied
Also
Stops over travel of landing gear

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16
Q

2 types of shock strut methods

A

Direct acting

Articulated

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17
Q

Purposes of shock struts

A

Absorb landing loads

Dampen recoil

Absorb taxi loads

18
Q

Types of struts

A

Olea pneumatic
Without seperator
With seperator

19
Q

Primary purpose of landing gear

A

To support aircraft on the ground

Also

Absorb landing and takeoff loads

Provide means of steering and manourving on the ground

20
Q

Describe what a trunnion is

A

This is the pivot point or bearing that attach the landing gear piston/strut to the frame

21
Q

What causes spongy brakes

A

Air in the brake line. The system needs bleeding

22
Q

What is bleeding

A

The process of pressuring then cracking the system to remove air that is trapped inside

23
Q

What bearing is used in aircraft wheels and why

A

Tapered roller bearings. As it handles high radial and axial loads

24
Q

What is segmented brakes

A

Segmented brakes or rotors are like puzzle pieces that fit together. They allow for thermal expansion

25
Q

3 SAFETY PRECAUTIONS with removing a wheel

A

ā— Prior to removing axle nut ensure wheel is fully deflated and valve core removed
ā— if icing occurs during deflation do NOT probe ice. Allow time for it to melt
ā— to deflate a Tyre use an adaptor that screws into valve stem. Do not just depress or remove the valve core

26
Q

3 methods of actuating landing gear

A

Hydraulic
Electrical
Mechanical

27
Q

What can prevent wheel vibration

A

Balancing the wheel

28
Q

3 functions of a tyre

A

Grip the ground (friction)
And easily replaced wearing surface
Electrical contact with the ground

29
Q

2 types of tyres

A

Tubed

Tubless

30
Q

Adv of tubeless over tubed tyres

A

Weight saving
Cooler running
Less deflation from punctures

31
Q

5 types of Tyre tread

A 
Plain/smooth
All weather
Ribbed
Chined
Anti shimmy
32
Q

If the edges of the Tyre are wearing faster than the Center this is due to?

A

Under inflation

33
Q

How do you know when a anti shimmy Tyre is worn

A

When the Center of the wheel shows wear marks

34
Q

How are flat spots caused

A

Locked/non rotating wheels on dry surface

35
Q

What is crazing and where does it occur

A

Cracking in sidewall due to sun exposed older tyres

36
Q

How do you store a Tyre

A

Store in cool, dry area out of direct sunlight. Store vertically on racks and ensure they are rotated regularly to avoid flat spots

37
Q

A cut is more than one half a rib. Is this serviceable

A

No, it should be removed and replaced

38
Q

If a cut is exposing ply material on the sidewall what is the cause of action

A

Removal and replacement of the tyre

39
Q

What is chattering and squealing

A

When the brakes enter a condition of being applied and released many times a second rather than exerting a smooth and even friction surface between the discs

40
Q

Ball vs roller bearings

A

Ball handle axial loads

Roller handle radial loads

41
Q

3 damages on bearings

A

Water stains - indicates grainual corrosion
Spalling - chipping on rolling surface
Overheating - discolouration and marks on rollers

WTLG (1 decks)

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