Landing gear and Brakes CBT's

Question 1

How many gear trucks are there? How many wheels?

Answer 1

4 main gear trucks and 1 nose gear truck.

Main are divided into: 2 body gear, 2 wing gear.

Each main gear truck has 4 wheels and the nose gear truck has 2. Total wheels, 18.

Question 2

What powers the gear extension and retraction?

Answer 2

Hydraulic system 1 and 4.

System 1: Body and nose

System 4: Wing gear

Question 3

What actuates the gear doors?

Answer 3

Wing gear: each has 1 hydraulically and 1 mechanically actuated gear doors

Body gear: each has 1 hydraulically and 2 mechanically actuated gear doors

Nose gear: 2 hydraulically and 2 mechanically actuated gear doors

Question 4

The wheel brakes have a normal system and an alternate system. How do you switch over to alternate?

Answer 4

It is fully automatic

Question 5

What system provides power to the wheel brakes?

Answer 5

Hydraulic system 4 (normal)

Hydraulic systems 1 or 2 (Alternate)

Question 6

How do you set the parking brake?

Answer 6

Push the brakes and pull up on the parking brake lever

Question 7

Are autobrakes available in alternate brake mode?

Answer 7

No, only in normal

Question 8

Is anti skid available in alternate brake mode?

Answer 8

Yes

Question 9

What do the alternate gear extension switches do?

Answer 9

They free fall the gear

Question 10

What powers the parking brake accumulator?

Answer 10

Hydraulic system 4 (alternate is system 1 and 2)

Question 11

The brake temperature range is what? What is normal range and what is high range? What color is hot brakes?

Answer 11

Between 0-9

0-4 is normal, 5 or higher are hot brakes

Hot brakes are amber (white are normal)

Question 12

Minimum brake cooling time if you get EICAS BRAKE TEMP

Answer 12

70 minutes after landing

(refer to QRH brake cooling schedule for specifics)

Question 13

What is the brake hydraulic system priority?

Answer 13

4, 1, 2

Question 14

Regarding anti skid, what is the only difference between normal mode and alternate mode?

Answer 14

The normal brake system provides each main gear wheel with individual antiskid protection. The alternate brake hydraulic system operates in a slightly lower capacity and provides antiskid protection to lateral wheel pairs rather than to individual wheels.

Question 15

Other than anti skid, what brake protection does the system provide?

Answer 15

Touchdown, hydroplane, locked wheel protection, and torque limiting.

Touchdown and hydroplane: Uses inertial speed

Locked wheel: Compares wheel speeds

Torque limiting: Excessive torque detected, releases brake pressure to prevent damage to landing gear

Question 16

How many Autobrake modes are there?

Answer 16

RTO, 1, 2, 3, 4, MAX

Question 17

You must be at least ___knots ground speed before the RTO function will work.

Answer 17

85

Question 18

Is MAX AUTO the same as full brake application manually?

Answer 18

Close, but it’s still less aggressive than stomping on the brakes 100%

Question 19

On landing, what 3 conditions must be met for the autobrakes to engage?

Answer 19

-On the ground
-Wheel spin up detected
-All thrust levers closed

Question 20

After autobrakes engage on landing rollout, what conditions would kick them off?

Answer 20

-Pedal brakes applied
-Any thrust lever advanced
-Speedbrake lever moved to DOWN detent
-DISARM or OFF position selected
-Any autobrake or antiskid system fault
-Loss of brake hydraulic pressure

Question 21

On the autobrake dial, why is there a DISARM and an OFF position?

Answer 21

Once you kick off the autobrakes on landing, it falls to the DISARM position. You must then select OFF to deactivate the system.