Landing Gear

Question 1

What does two amber XX’s mean in place of a green triangle on the WHEEL SD page?

Answer 1

One LGCIU has failed

Question 2

When does a green arc appear over brake?

Answer 2

When one brake >100degC

Question 3

When does an amber arc appear over brake?

Answer 3

When one brake >300degC

Question 4

Maximum brake temperature for take off without any brake fans? With brake fans?

Answer 4

300degC without fans, 150degC with fans

Question 5

When do the fusible plugs melt in the tyre? Why do they do this?

Answer 5

When brakes reach 800degC to prevent tyre burst

Question 6

Maximum speed with landing gear extended? VLE

Answer 6

280kt

Question 7

Maximum speed for landing gear extension? VLOe

Answer 7

250kt

Question 8

Maximum speed for landing gear retraction? VLOr

Answer 8

220kt

Question 9

Maximum tyre speed?

Answer 9

195kts

Question 10

Maximum wiper operating speed?

Answer 10

230kts

Question 11

Maximum window open speed?

Answer 11

200kts

Question 12

4 modes of braking

Answer 12

1) Normal - Green sys; anti skid; autobrake; no pressure indications

2) Alternate with anti skid - Yellow sys; anti skid; no autobrake

3) Alternate without anti skid - anti skid deactivated either:
a) Electrically - BSCU fail, A/SKD NWS switch
b) Hydraulically - Y+G LOW PR -> brakes supplied by accum only - 7 applications
Automatically 1000psi max to avoid wheel lock and tire burst

4) Parking brake- Yellow sys or accumulator

Question 13

Why is Alternate Braking Without Antiskid limited to 1000psi?

Answer 13

Prevent wheel locking

Question 14

How many full braking applications on accumulator braking?

Answer 14

7

Question 15

Describe autobrake deceleration modes

Answer 15

Low - spoiler activation + 2s @ 2/s
Med - spoiler activation + 2s @ 3m/s
Max - when thrust levers are closed above 72kts

Question 16

When will DECEL light come on?

Answer 16

When 80% of target deceleration achieved

Question 17

How does anti skid function?

Answer 17

Maintains wheel speed just above impending skid.
Disabled below 20kts
Compares wheel speed to aircraft speed and if not equal releases the brakes

Question 18

QRH procedures for gear/brakes?

Answer 18

Loss of braking
Gravity gear extension
Landing with abnormal gear
Asymmetric braking

Question 19

When is Autobrake available?

Answer 19

Normal Brakes

Question 20

The landing gear panel on the middle console is connected to which LGCIU?

Answer 20

LGCIU 1

Question 21

How many degrees of nose wheel steering do we get from:

Rudder pedals
Tiller

And at what speed do we have none?

Answer 21

Rudder pedals
+/- 6° progressively less to 130kts

Tiller
+/-75° progressively less to 80kts

Question 22

On the ECAM
We see NW STRG DISC in green meaning the selector is in the towing position.
When does this memo turn amber?

Answer 22

If one engine is running

Question 23

Below what speed does anti skid deactivate ?

Answer 23

20kts
Careful tasting

Question 24

Above what speed to ground spoilers extend?

Answer 24

72kts
Therefore during an RTO autobrake wont kick in unless above this speed!

Question 25

When does auto brake kick in?

Answer 25

Ground spoiler extension + 2 second delay

Question 26

Why is the break temp limit 300 degrees?

Answer 26

Because that temp ensures the hydraulic fluid will not ignite in the wheel well.

Question 27

When does the LDG GEAR safety valve operate?

Answer 27

When the aircraft is flying faster than 260 kt, a safety valve automatically cuts off hydraulic supply to the landing gear system. Below 260 kt, the hydraulic supply remains cut off as long as the landing gear lever is up.

Question 28

When do the LGCIUs swap?

Answer 28

On gear retraction

Question 29

What does the red downward facing arrow next to the gear handle indicate?

Answer 29

Gear not downlocked in when in landing configuration

Question 30

What is the status of the landing gear doors and gear after Gravity Gear Extn?

Answer 30

Doors remain open Gear cannot be retracted

Question 31

After RTO with Autobrake, how do you disarm Autobrake?

Answer 31

Disarm spoilers.

Question 32

Describe general spoiler deployment logic

Answer 32

Similar for RTO and Landing (for RTO, speed must be >72kt) **When will the spoilers deploy:** If spoilers armed - Thrust levers idle (and both gear on the ground) If spoilers not armed - Reverse selected on at least one engine (and both gear on the ground)

Question 33

When does the pressure indicator in the cockpit indicate pressure?

Answer 33

Only indicates pressure when the yellow system controls brake pressure: * Alternate Braking system * Parking Brake applied (Top part of gauge shows yellow accumulator pressure)