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EGK Systems > Brakes + Tyres > Flashcards

Brakes + Tyres Flashcards

1
Q

Ply Rating

A

Tyre strength

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2
Q

Tyre Tread is…

A

Patterns (ribbed etc)

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3
Q

Types of tyre

A

Bias - Plies laid in pairs 90 degrees

Radial - Laid from bead to bead

Tubeless - No inner tube to contain gas (reduction in weight/cool running)

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4
Q

Retreading a tyre

A

Can be remoulded several times with new crown as long as wheel structure is sound

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5
Q

Tyre Creep

A

Creep marks - 1 inch for 24 inch or 1.5 inch for tyres over 24 inch

Most likely on first landings/needs to be monitored

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6
Q

Tyre Overheat Protection

A

Fusible plug - Bursts before tyre fails

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7
Q

X3 Wheel Construction

A

Well Based - Light AC (Tubed)

Detachable Flange - Easy to replace

Split - Large AC tubeless

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8
Q

Light AC Wheel Brakes

A

Fixed - Floating calliper mounted to landing gear/disc bolted to wheel

Floating - Calliper bolted to landing gear via torque plate/disc keyed not bolted to main wheel

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9
Q

Brake Fade

A

Affects conventional steel brakes
Result of brakes overheating
Cannot absorb any further energy causing retardation issues

Judder/stick to disc

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10
Q

Automatic Brake Adjuster

A

Ensures correct clearance between rotating assemblies when brakes are off

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11
Q

Advantages of carbon brakes

A

Lighter
Absorb twice as much heat as steel - less brake fade
Carbon brakes last longer
More expensive but last longer

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12
Q

Heat Dissipation

A

Read SOP regarding break cooling time and let ATC know

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13
Q

Tyre Speed rating

A

Limiting speed for tyre must match or exceed this rating

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14
Q

Anti Skid role

A

To relief brake pressure on normal/dry/wet/contaminated runway to prevent skidding when wheel is turning slower

Controller predict slip ratio based on speed and reduces pressure to wheel to let it spin back up then reapply.

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15
Q

Functions of Anti Skid

A

Skid Protection
Bounce Protection
Touch down protection
Hydroplane protection (ops on boogie)

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16
Q

Auto brake system function

A

“Armed” sense certain conditions when brakes are needed.

  • power needs to below a certain level
  • deactivated if brake pedals applied/switched off/throttle action
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17
Q

Auto Retract

A

After TO brakes forced to stop turning before entering wheel well.

Rubber snubbers

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18
Q

Parking Brake

A

Brake pressure applied and held

! Overrides other braking systems anti skid systems
! Do not set in flight
! Do not set if brakes are excessively hot

19
Q

Weakest Part Of Wheel

A

The side wall

20
Q

Conditions needed to check for brake wear

A

Brakes must be applied

21
Q

Auto brake Condition For disarming

A

Manual Braking
Advancing thrust
Moving speed brake lever down
Moving auto brake selector to disarm
Not activated below 85kts

22
Q

Too Low tyre pressure

A

Excessive wear on shoulders

23
Q

Too high tyre pressure

A

Excessive wear on the crown

24
Q

RTO mode Auto Brakes

A

Provides fixed level of deacceleration until stand still

25
Q

Primary element for automatic ground spoiler deployment

A

Weight on wheels on touch down

26
Q

Shimmy preventions

A

Hydraulically locking steering piston
Hydraulic dampers
Self centring springs
Double nose wheels

27
Q

Tyre Wear Limits for ribbed treads

A

Minimum tread depth is 2mm measured from bottom of groove

28
Q

Tyre Wear limits of blocked treats

A

Within limits provided block pattern is still visible

29
Q

Auto Brakes conditions needed are..

A

Armed
Thrust levers set to idle or reverse
Brake pedals not touched
Wheels speed average 88kt
Anti skid system must be on and serviceable
Hydraulic system must be functional

30
Q

4 types of anti skid protection

A

Hydroplane - applied to rear wheels on a bogie
Skid Protection - reduce brake pressure
Bounce - system release pressure if bounce occurs on touchdown
Touchdown - prevent any brake pressure prior to touchdown

31
Q

Carbon Brakes - Limiting Wear

A

Dependent on total number of brake applications
One firm brake causes less wear than several light applications
Like working when brakes are HOT
Less sensitive to weight and speed than steel

32
Q

Steel brake - Limiting wEAR

A

Using large number of small light brake application to allow brakes to cool between applications

Weight/speed reduce brake life on steel due to kinetic energy increase

33
Q

Tillter

A

Large deflection up to 78 degrees nose wheel steering on large ac

34
Q

Rudder pedal steering

A

Max 7 degrees

35
Q

What are the input data of the anti skid system

A

Wheel speed
Ground speed
Wheel speed of all wheels on boogie

36
Q

Definition of nose wheel shimmy

A

As oscillatory lateral movement of the nose wheel about the longitudinal axis of the aircraft when the nose wheel is in contact with the runway during the take off and landing rung

37
Q

Anti Retract Latch

A

Prevent inadvertent up selection of landing gear on ground.

Can be overridden for maintenance etc

38
Q

Most stress is carried by a torsion link…

A

Between the inner and outer cylinder of the main oleo leg during a small radius turn

39
Q

Pressurised nitrogen bottle system

A

Activated by pulling red gear control handle giving one shot extension of the landing great.

40
Q

Thermal Plugs

A

Operate a safety valve when excessive temperature reached in wheel assembly allowing controlled tyre deflation

41
Q

Nose wheel shimmy

A

Lateral movement about the longitudinal axis in contact with the runway

42
Q

When the pilot forget to arm the auto brake system what happens

A

Nothing there will be no warning generated during take off

43
Q

RTO applies the maximum possible deceleration not constant

A

EGK Systems (15 decks)

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