Landing Gear And Brakes

Question 1

How are the landing gears controlled?

Answer 1

2 LGCIU’s

Question 2

How is nose wheel steering and braking controlled?

Answer 2

Break steering control unit (BSCU)

Question 3

What happens if LGCIU1 fails?

Answer 3

LGCIU 2 takes over

Question 4

When do the LGCIU’s switch over?

Answer 4

On landing gear retraction

Question 5

Which hydraulic system supplies, the landing gears and doors?

Answer 5

Green hydraulic system

Question 6

Above what speed is landing gear movement prevented?

Answer 6

260 kts

Question 7

If you see Amber X’s in half of the landing gear indications on the wheel SD page what does this indicate?

Answer 7

One of the LGCIU has failed. As long as green is indicated in the second half the landing gear is down and locked.

Question 8

What if half of the landing gear indicators are red?

Answer 8

The respective LGCIU cannot detect the proximity switch indication. The second half can be used to confirm landing your position.

Question 9

What is Vlo?

Answer 9

250 kts

Question 10

What is the max altitude to extend the landing gear?

Answer 10

FL 250

Question 11

Vle

Answer 11

280 kts (M0.67)

Question 12

Vret

Answer 12

220 kts

Question 13

Can the gravity gear extension crank be reset?

Answer 13

No

Question 14

How many turns of the hand crank is required to gravity extend the gear?

Answer 14

3

Question 15

What happens at each turn of the hand crank for the gravity extension

Answer 15

• Closest hydraulic cut off valve which removes pressure from the system
• Releases the dear and door locks and allows the doors to full open
• Releases the gear up locks and the landing gear extends into place

Question 16

How is the nose wheel steering powered?(hydraulic system)

Answer 16

Green hydraulic system

Question 17

What is the max angle the nose wheel can be steered to using the hand wheel?

Answer 17

75°

Question 18

Up to what speed is full nose wheel steering angle available?

Answer 18

20 kts

Question 19

At what speed is the nose wheel steering angle limited to 0 kts?

Answer 19

80 kts

Question 20

If both hand wheels are used at the same time, what happens?

Answer 20

Both orders are added up to a sum and sent to the BSCU

Question 21

Using the rudder pedals up to what angle can the nose wheel be steered to? Up to what speed?

Answer 21

6° up to 40 kts

Question 22

At what speed is the rudder pedal authority at 0 kts for nose wheel steering?

Answer 22

130 kts

Question 23

Is nose wheel steering available after gravity extension?

Answer 23

No

Question 24

Normal braking uses which hydraulic system?

Answer 24

The green hydraulic system

Question 25

The alternate braking system uses which hydraulic system?

Answer 25

Yellow hydraulic system

Question 26

Is antiskid available during alternate breaking?

Answer 26

Yes, through the yellow hydraulic system, unless both BSCU fail.

Question 27

What if both green and yellow hydraulic system fail? Is breaking still available?

Answer 27

Yes, through the yellow to brake accumulator

Question 28

How many break applications does the yellow brake accumulator allow?

Answer 28

7 full applications

Question 29

What is the maximum N1 that may be applied when the park brake is on?

Answer 29

75% N1

Question 30

What is the maximum brake temperature for takeoff?

Answer 30

300°C

Question 31

On takeoff, above what speed do the spoilers deploy, if an aborted takeoff is performed?

Answer 31

72kts

Question 32

How can the autobrake be disengage?

Answer 32

• Applying pressure to each break
• pressing the MAX AUTO BRK pb
• Retracting the ground spoilers