Brakes Flashcards

0
Q

What is brake by wire?

A

A signal is sent from the brake control (BCU) to the 4 brake control valves.

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1
Q

How is braking controlled?

A

Electrically controlled and hydraulically actuated

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2
Q

Which brakes do the hydraulic systems supply?

A

1 and 4 - hydraulic system 1

2 and 3 - hydraulic system 2

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3
Q

What is the power source for the outboard and inboard brakes?

A

1 and 4 - ess. DC 1

2 and 3 - ess. DC 2

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4
Q

What is gear retraction braking?

A

The BCU applies the brakes to stop rotation of the main gear wheels.

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5
Q

How is the nose wheel rotation stopped?

A

A snubber in the nose wheel compartment.

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6
Q

What is the touchdown protection system?

A

Touchdown +3 seconds
50kts wheel speed

1 switch can fail

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7
Q

What is the leak protection system?

A

It closes the shutoff valves below 1500psi

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8
Q

What is the anti skid system?

A

4 signals, if one falls below average pressure is reduced on that side.

Deactivated below 10 kts

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9
Q

What is locked wheel protection?

A

Above 30kts
1 wheel 30% lower than the others pressure is reduced on that wheel.

Below 30kts it’s deactivated.

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10
Q

If the plane thinks it’s in the air what brakes do we have?

A

Emergency braking below 10 kts.

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11
Q

What system supplies the emergency brakes?

A

Hydraulic system 2

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12
Q

How long will the accumulator supply brake pressure?

A

24 hours or

6 emergency actuations

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13
Q

Hydroplanning speed.

A

EP 109kts

LR 113kts

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