Landing Gear and Brakes

Question 1

How many wheels on each landing gear?

Answer 1

Two.

Question 2

How is the landing gear raised and lowered?

Answer 2

Electrically controlled and hydraulically actuated.

Question 3

How is the landing gear ‘locked down’ when on the ground?

Answer 3

Locking pins, installed and removed by maintenance.

Question 4

What does the proximity sensing unit monitor and control?

Answer 4

Landing gear retraction and extension.
Landing gear position.
Thrust reverser status.
Door position status.

Question 5

How is the main gear held in the up position?

Answer 5

Mechanical uplocks.

Question 6

Which hydraulic system actuates the nose gear?

Answer 6

System 3.

Question 7

How is the gear deployed if gear handle movement fails?

Answer 7

A manual release lever is installed to lower the main gear.

Question 8

What parameters are monitored to detect a landing configuration warning sound?

Answer 8

Airspeed, gear handle position, flap position and thrust lever position.

Question 9

When will a ‘too low gear’ sound be activated?

Answer 9

When lower than 190 kt and less than 500 ft on the radio altimeter.

Question 10

When is the landing gear configuration warning inhibited?

Answer 10

For two minutes after take-off.

Question 11

Which systems power the main brakes?

Answer 11

Hydraulic system 3 - inboard.

Hydraulic system 2 - outboard.

Question 12

How much pressure will the brakes hydraulic accumulators supply in the event of a hydraulic system failure?

Answer 12

6 applications with the anti-skid off.

Question 13

How is wheel rotation stopped after take-off during gear retraction?

Answer 13

Hydraulic pressure to the brakes on the main gear and a snub for the nose gear.

Question 14

How is brake wear assessed?

Answer 14

Brake wear pins - two on each assembly.

Question 15

What does the anti-skid control unit do?

Answer 15

Modulates hydraulic pressure to each wheel brake to ensure no skidding.

Question 16

When armed, when is the anti-skid active?

Answer 16

Above 10 kt.

On landing w-o-w plus 5 seconds or wheel speed greater than 35 kt.

Question 17

If a brake overheat occurs, when can it be reset?

Answer 17

After maintenance inspects the system.

Question 18

Which hydraulic system powers the nose wheel steering?

Answer 18

System 3.

Question 19

How is the nose wheel steering system controlled?

Answer 19

Electronically, there is no mechanical linkage.

Question 20

How is the aircraft steered on the ground?

Answer 20

Pedals and tiller.

Question 21

How much nose wheel deflection do the pedals and tiller provide?

Answer 21

8º pedals.

80º tiller.

Question 22

When the nose wheel steering switch is armed, when will the system become active?

Answer 22

Weight-on-wheels.
Hydraulic pressure in system 3.
Nose gear down and locked.

Question 23

What happens when the nose wheel steering switch is disarmed?

Answer 23

The nose wheel goes into free castoring mode.

Question 24

Can the tiller and nosewheel combine to tighten taxi turns?

Answer 24

No.