BRAKES/WHEELS

Question 1

When is maintenance action required due high brake temperature?

Answer 1

• Temp difference between two brakes of a gear is
  more than 150 deg C and one of those brakes is
  more than 600 deg C
• Temp difference between two brakes of a gear is
  more than 150 deg C and one of those brakes is
  less than 60 deg C
• Temp of one brake is more than 800/900 deg C

Question 2

When should the brake fans be turned on during Taxi out?

Answer 2

If brake temp is above 100 deg C

Question 3

Above what brake temperature shall take-off be delayed?

Answer 3

Above 150 deg C with Brake Fans ON and above 300 deg C with Brake Fans OFF

Question 4

What are the procedures regarding Brake fans on Taxi In?

Answer 4

Delay Brake Fans for 5 min or until arriving at the gate unless brake temp is likely to go above 500 deg C

Disregard the green arc and display of BRAKE HOT

Question 5

How do we handle the Park Brake with regards to brake temperatures at the Parking Bay on arrival?

Answer 5

Release Park Brake when chocks are in position and when Brake Temp are above 300 deg C with Fans OFF (150 deg C with the Fans ON)

Avoid using Park Brake above 500 deg C with Fans OFF

Question 6

At parking during a short turn around, how do you handle the Brake Fans?

Answer 6

Keep the Brake Fans ON until temperature is almost the same as the ambient temperature

Question 7

When can you select the Brake Fans to OFF at the gate upon arrival?

Answer 7

When the green arc is gone (100 deg C)

Question 8

What is the max steering angle from the rudder pedals?

Answer 8

6 deg

Question 9

Is the relationship between tiller deflection and nose wheel angle linear or non-linear?

Answer 9

Non-linear. More tiller input means exponentially more nose wheel angle

Question 10

At what upper speed limit is nose wheel steering disconnected?

Answer 10

At 130 kts

Question 11

What two factors affect carbon brake wear?

Answer 11

1. The wear of the disks depending on the nr of
   brake applications
2. The oxidation of the disks

Question 12

What is the cause of oxidation of the brakes?

Answer 12

Repetitive high brake temperature (400 deg C)

Question 13

What autobrake setting is the preferred one and why?

Answer 13

LO is the preferred one due lower brake temperatures which leads to lower brake oxidation

Question 14

What systems assist us for braking upon landing?

Answer 14

• Spoilers
• Reversers
• Wheel brakes

Question 15

When do we stow the reversers after landing?

Answer 15

At taxi speed and before leaving the runway in order to avoid foreign object ingestions

Question 16

When do we use autobrake MED?

Answer 16

On short or contaminated runways

Question 17

When using Autobrake MED, what combination of Flaps and Reverse should be avoided and why?

Answer 17

CONF FULL and MAX REV as this minimizes the energy absorbed by the brakes

Question 18

At what brake temperatures during Preliminary Cockpit Preparation should you not set the parking brake?

Answer 18

500 deg C without Brake Fans
350 deg C with Brake Fans

Question 19

Why must the park brake be set when doing a walk around?

Answer 19

To be able to check the brake wear pins

Question 20

What systems assist us for braking upon landing?

Answer 20

• Spoilers
• Reversers
• Wheel brakes

Question 21

What is the optimum way to use brakes during taxi?

Answer 21

Let the aircraft accelerate up to 30 kts and then use one smooth brake application to decelerate to 10 kts

Question 22

What is the steering angle of the nose wheel with the handwheel?

Answer 22

75 deg

Question 23

What is the max steering angle the ground crew can use while towing?

Answer 23

95 deg

Question 24

What does the GREEN NW STRG DISC msg mean?

Answer 24

NWS is in the towing position with engines not running

Question 25

What is the purpose of having a max brake temp limitation for take-off?

Answer 25

At the max temp limit there is no risk of leaking hydraulic fluid that touches the wheels to ignite in the wheel well when gear is retracted

Question 26

By how much can the indicated and actual brake temperature vary, due to Brake Fan usage?

Answer 26

50 to 150 deg

Question 27

Can we take off with BRK FANS ON?

Answer 27

No, due to the risk of FOD to fans and brakes