Landing Gear & Brakes

Question 1

Which hydraulic system powers the nose wheel steering?

Answer 1

Yellow

Question 2

Above what speed are the rudder pedals disconnected from NWS?
Above what speed is the tiller disconnected from NWS?

Answer 2

Rudder pedals - 130kts
Tiller - 80 kts

Question 3

What affect does moving both steering tillers at the same time have on the nose wheel?

Answer 3

The movements are added together and then applied to the NWS

Question 4

What are the maximum NWS angles with
-Max rudder deflection?
-Max tiller deflection?
-Tow bar with steering bypass pin?

Answer 4

• Rudder +/- 6deg
  -Tiller +/- 75deg
  -Bypass pin +/- 95deg

Question 5

Describe the 4 types of braking on the aircraft?

Answer 5

Normal braking with anti-skid (green system)
Alternate braking with anti-skid (yellow system)
Alternate braking without anti-skid (yellow system)
Hydraulic accumulator only (yellow system accum pressure only)

Question 6

What is the limit to alternate brakes without anti skid braking pressure?

Answer 6

1000 PSI to prevent skidding

Question 7

Which hydraulic system powers
Normal brakes
Alternate brakes
Stored accumulator pressure

Answer 7

Normal - Green
Alternate - Yellow
Accumulator - Yellow

Question 8

How many full braking applications are supplied with accumulator pressure?

Answer 8

7

Question 9

What are the autobrake arming conditions?

Answer 9

Green hydraulics functioning
Anti/skid electrically powered
1 ADIRU available

Question 10

When does the Autobrake activate in Low, Medium & Max mode and what are the Decel rates for Low & Medium?

Answer 10

Low - 2 seconds after ground spoiler deployment, 2 m/s
Medium - 2 seconds after ground spoiler deployment, 3 m/s
Max - As soon as ground spoilers deploy, speed must reach at least 72kts

Question 11

When will the DECEL light illuminate during the landing roll?

Answer 11

When braking reaches 80% of the selected rate

Question 12

Is there a possibility the DECEL light will not illuminate during deceleration?

Answer 12

Yes, on slippery runways 80% rate may not be achieved due to antiskid function

Question 13

How does the anti-skid function and what speed is it disabled?

Answer 13

Anti-skid releases the brakes just before an impending skid. It compares wheel speed to aircraft speed and if wheel speed drops below approximately 0.87x aircraft speed the brake is released.

Antiskid disabled below 20th groundspeed

Question 14

What is the tyre limiting speed?

Answer 14

195 kts

Question 15

What procedures about landing gear are contained in the QRH?

Answer 15

Loss of braking
Gravity gear extension
Landing with abnormal landing gear
Residual brake pressure
Asymmetric braking

Question 16

What speed is the gear safety lock activated?

Answer 16

260 knots, hydraulic supply cut off above this