Braking systems

Question 1

Braking options

Answer 1

Aerodynamic drag - spoilers, drag chute Friction - wheel brakes Mechanical restraint - arrester hook Engine power - reverser thrust, propeller pitch

Question 2

Wheel brakes

Answer 2

they convert kinetic energy into thermal energy they must provide sufficient friction to stop the aircraft at given distances and at prescribed velocities over different surface conditions safely.

Question 3

Benefits of carbon disks

Answer 3

40% lower mass than steel lower thermal expansion high heat store per unit mass reduced maintenance cost-longer life the surrounding structure limits a heat sink operation temperature

Question 4

General design aspects

Answer 4

safety performance landing, RTO distances longevity, reliability and dispatch mass and strength certification compliance crew interface production and maintenance costs

Question 5

Braking control

Answer 5

manual autobrake anti-skid

Question 6

Anti-skid

Answer 6

skid control locked wheel protection hydroplane/touchdown taxi break release-prevents the loss of aircraft control on the ground faster landing speeds heavier landing payloads shorter stopping distances in a ll conditions

Question 7

Autobrake

Answer 7

aims to increase passenger comfort due to continued and smooth braking action reduced crew workload

Question 8

Armed(all) autobrake

Answer 8

crew select required setting aircraft on the ground throttle at forward thrust idle position self test routine satisfactory

Question 9

Disarmed(any) autobrake

Answer 9

crew deselect crew manual braking advancing thrust lever auto overshoot selected

Question 10

Integration

Answer 10

wheel brake system integrated via brake and steering control unit(BSCU) and AIMS with thrust management system flight control system flight management system

Question 11

Electric brake system

Answer 11

uses electromechanical actuation no hydraulics reduced mass simplified system therefore less space used