BRAKE

Question 1

BCU is also responsible for:

Answer 1

1) Anti-Skid Protection
2) Wheel locked protection
3) Touchdown protection

Question 2

Anti-Skid Protection

Answer 2

• Available > 10 kts
• BCU Monitors wheels velocity compares it against the pedal deflection and if wheel speed is slower it will reduce brakes on that one wheel

Question 3

What’s monitoring brake pressure?

Answer 3

Pressure transducers

Question 4

Brake system consist of:

Answer 4

1) Normal braking
2) Emergency braking
3) gear retraction in-flight braking

Question 5

How to check brake wear?

Answer 5

Top/bottom brake wear indicators

Question 6

Locked wheel protection

Answer 6

• Active Wheel speed > 30 kts

* if one wheel speed is lower than others but 30% BCU will relieve all braking for that one wheel

Question 7

What supplies normal brake system?

Answer 7

• Hydraulic system #1,2
• Electrically commanded and monitored
( Brake by wire )

Question 8

Normal braking without valid ground WOW signals

Answer 8

Active down to 10kts ( use emergency brake to stop )

Question 9

Touchdown protection

Answer 9

Whichever happens first:

1) WOW + 3 sec
2) Wheel speed of 50 kts

Done through BCU and Shut off valves

Question 10

Electrical system of normal brakes

Answer 10

BCU
             |
 Shut off valves ( each side )
             |
1,4------------2,3 ( brake control valves)