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MyAGK > S Wheels, Tyres and Brakes > Flashcards

S Wheels, Tyres and Brakes Flashcards

1
Q

What does a tyre ply rating indicate?

A

Strength - higher ply = higher strength

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2
Q

What is tyre creep?

A

Only relevant for tubed tyres
Sudden accelerations cause the wheel to slip around the tyre, greatest after new tyre has been fitted, monitored with creep marks

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3
Q

What should the dimensions of the creep marks be?

A
  • 1 inch wide for tyres less than 24 inch diameter

- 1.5 inch wide for tyres greater than 24 inch diameter

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4
Q

When are the creep marks within their limit?

A

Whenever there is some overlap

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5
Q

What is Vtyre?

A

Aircraft tyre limiting speed on the ground, often rated in mph

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6
Q

What will exceeding Vtyre cause?

A
  • Excess tyre heat

- Excess the stress causing damage

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7
Q

What is the minimum tread depth of a ribbed tread?

A

2mm

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8
Q

How do you know if blocked treads have sufficient depth?

A

Tyre wear marker bar - sits flush with grooves when tread is insufficient

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9
Q

What should tyres be inspected for?

A
  • Cuts
  • Bulges
  • Flat spots
  • FOD
  • Contamination
  • Creep
  • Wear
  • Pressure
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10
Q

What pressure do large aircraft tyres operate at?

A

High pressure - 200-315psi

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11
Q

What happens if one tyre is punctured on a bogie?

A

All tyres on the bogie must be replaced

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12
Q

What is a fusible plug?

A

Melts when the tyre overheats and allows gas inside the tyre to escape in a controlled way

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13
Q

How do light aircraft brakes work?

A

Hydraulic pressure claps friction pads tightly against a steel disk

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14
Q

What are the 2 types of light aircraft brakes?

A
  • Fixed disk - Floating calliper

- Floating disk - Fixed calliper

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15
Q

How is break wear monitored on light aircraft wheel brakes?

A

Friction pads erode - special gauge can be used t measure gap between disc and brake housing
Brake wear indicator pin - as the pad wears a pin pops out indicating wear

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16
Q

What are the consequences of brake wear?

A
  • Overheating
  • Brake damage
  • Loss of brake efficiency
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17
Q

What is brake fade?

A

On conventional steel disc brakes, excessive heating diminishes braking efficiency

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18
Q

What are multiple disc brakes?

A

Series of pads arranged around both sides of the stator assembly

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19
Q

What material are large aircraft brakes usually?

A

Steel rotors

Ceramic pads

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20
Q

What is the automatic brake adjuster?

A

Ensures correct clearance between the rotating assemblies when he brakes are in the off position

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21
Q

On a large transport angle how does the brake wear indicator pin work?

A

As the pad wears down the pin extracts into the housing, the pads must be replaced when the pin is flush with the adjuster housing

22
Q

What are the advantages of the carbon braking system?

A
  • Lighter
  • Absorbs twice as much as steel
  • Less prone to brake fade
  • Lasts longer (30%-175% improvement)
  • More expansive to fit but last longer so lower overall cost
23
Q

When should you be aware of high brake temperatures?

A
  • Hot and high landing
  • High weight
  • Short taxi to stand
  • High speed aborted take off
24
Q

How do large aircraft counter brake heating?

A

Brake fan units

25
Q

Who needs to be informed in the event of a brake overheat?

A

ATC

26
Q

What does the ECAM or EICAS display regarding brake temps?

A

Usually shows hottest brake temp

27
Q

What is maximum deceleration?

A

Maximum brake force to a rotating wheel without stopping it

28
Q

What happens if the anti-skid system detects a wheel spinning too slowly?

A

Releases brake pressure momentarily to allow it to get back up to speed and stop skidding

29
Q

When can the anti skid provide skid protection?

A

Normal, dry and wet runways

30
Q

What is touchdown protection?

A

Prevents brake pressure being applied before touchdown, even if the pilot inadvertently applies pressure to the pedals

31
Q

What’s is bounce protection?

A

If the aircraft bounces on touch down the brakes release

32
Q

What is the result of aquaplaning?

A
  • Reduced or no braking ability
  • Loss of directional control
  • Damage to tyres from superheated steam
33
Q

What is hydroplane protection?

A

Operates only on the rear wheels, when wheel speed is less than ground speed the system releases brake pressure on the rear wheels

34
Q

What is auto-brake?

A

Can bring aircraft to a halt with no intervention from the pilot

35
Q

What are the prerequisites for auto brake?

A
  • Auto-brake selected on and deceleration level selected
  • Anti-skid system on and serviceable
  • Power levers set below a certain value
  • Hydraulic systems functional
  • Brake pedals depressed
36
Q

What can override automatic braking?

A
  • Brakes being applied manually

- Power set to TOGA

37
Q

What level of braking does RTO provide?

A

Max braking if:

  • Speed greater than 90kt
  • Thrust levers idle
  • Touching brakes will disarm the system
38
Q

How can inoperative anti-skid effect landing distance?

A

Landing distance can double

39
Q

What is displayed if there is an anti skid fault detected?

A

Amber warning caption

40
Q

What operational considerations are there if anti skid is faulty?

A

Runway type, length and contamination

41
Q

How many brake applications does the emergency brake accumulator provide?

A

6

42
Q

What are the limitations of the emergency brake accumulator?

A
  • No anti-skid
  • No differential braking
  • Directional control problems
  • 6 applications
43
Q

What does he parking brake do?

A

Allows brake pressure to be held

44
Q

Why should the parking brake never be used in flight?

A

Overrides all other braking systems

  • Disables anti-skid
  • Disables touch down protection
45
Q

Why are tyres inflated with nitrogen?

A
  • It is inert
  • Thermally stable
  • It is dry (corrosion reduction)
46
Q

What is the tyre crown?

A

Holds the tread pattern and makes contact with the surface

47
Q

What is the tyre shoulder?

A

Thins from crown to side wall

48
Q

What is the tyre sidewall?

A

Weakest part and least able to cope with damage

49
Q

What is the tyre bead?

A

Engages with rims on the wheel o form an airtight seal

50
Q

What are chined tyres?

A

Deflect water spray away from the sides of the tyres, minimise water spray ingestion into engines

MyAGK (37 decks)

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