Brakes + Tyres Flashcards by Unknown Unknown

Ply Rating

Tyre strength

How well did you know this?

Not at all

Perfectly

Tyre Tread is…

Patterns (ribbed etc)

How well did you know this?

Not at all

Perfectly

Types of tyre

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)

How well did you know this?

Not at all

Perfectly

Retreading a tyre

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

How well did you know this?

Not at all

Perfectly

Tyre Creep

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

How well did you know this?

Not at all

Perfectly

Tyre Overheat Protection

Fusible plug - Bursts before tyre fails

How well did you know this?

Not at all

Perfectly

X3 Wheel Construction

Well Based - Light AC (Tubed)

Detachable Flange - Easy to replace

Split - Large AC tubeless

How well did you know this?

Not at all

Perfectly

Light AC Wheel Brakes

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

How well did you know this?

Not at all

Perfectly

Brake Fade

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

Judder/stick to disc

How well did you know this?

Not at all

Perfectly

Automatic Brake Adjuster

Ensures correct clearance between rotating assemblies when brakes are off

How well did you know this?

Not at all

Perfectly

Advantages of carbon brakes

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

How well did you know this?

Not at all

Perfectly

Heat Dissipation

Read SOP regarding break cooling time and let ATC know

How well did you know this?

Not at all

Perfectly

Tyre Speed rating

Limiting speed for tyre must match or exceed this rating

How well did you know this?

Not at all

Perfectly

Anti Skid role

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.

How well did you know this?

Not at all

Perfectly

Functions of Anti Skid

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

How well did you know this?

Not at all

Perfectly

Auto brake system function

“Armed” sense certain conditions when brakes are needed.

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

How well did you know this?

Not at all

Perfectly

Auto Retract

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

Rubber snubbers

How well did you know this?

Not at all

Perfectly

Parking Brake

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

Weakest Part Of Wheel

The side wall

Conditions needed to check for brake wear

Brakes must be applied

Auto brake Condition For disarming

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

Too Low tyre pressure

Excessive wear on shoulders

Too high tyre pressure

Excessive wear on the crown

RTO mode Auto Brakes

Provides fixed level of deacceleration until stand still

Primary element for automatic ground spoiler deployment

Weight on wheels on touch down

Shimmy preventions

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

Tyre Wear Limits for ribbed treads

Minimum tread depth is 2mm measured from bottom of groove

Tyre Wear limits of blocked treats

Within limits provided block pattern is still visible

Auto Brakes conditions needed are..

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

4 types of anti skid protection

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

Carbon Brakes - Limiting Wear

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

Steel brake - Limiting wEAR

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

Tillter

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

Rudder pedal steering

Max 7 degrees

What are the input data of the anti skid system

Wheel speed Ground speed Wheel speed of all wheels on boogie

Definition of nose wheel shimmy

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

Anti Retract Latch

Prevent inadvertent up selection of landing gear on ground. Can be overridden for maintenance etc

Most stress is carried by a torsion link…

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

Pressurised nitrogen bottle system

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

Thermal Plugs

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

Nose wheel shimmy

Lateral movement about the longitudinal axis in contact with the runway

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

Nothing there will be no warning generated during take off

RTO applies the maximum possible deceleration not constant