Landing Gear

Question 1

Describe how anti skid systems works

Answer 1

Compares wheel tachometer speed vs aircraft ref speed

If wheel speed <0.87 a/c ref speed

Indicates a skid

Closes anti skid valve

Brake press released to prevent lock up

Question 2

Parking brake off which HYD system?

Answer 2

Yellow

Question 3

What happens to other braking systems when parking brake is on?

Answer 3

Deactivates all other systems

Question 4

When does an arc come over brakes?

Answer 4

Hottest brake over 100C

Question 5

When does brake temp ECAM caution come on?

Answer 5

> 300 C

Question 6

3 modes alternate braking can operate

Answer 6

1) AB WITH ANTI SKID
2) AB WITHOUT ANTI SKID
3) AB WITHOUT ANTI SKID ACC PRESS

Question 7

Which computers control in these schenario

1) AB WITH ANTI SKID
2) AB WITHOUT ANTI SKID
3) AB WITHOUT ANTI SKID ACC PRESS

Answer 7

1) ABCU BSCU
2) ABCU
3) ABCU

Question 8

Green HYD pressure unavail what happens to braking systems?

Answer 8

Auto switches to yellow ALT BRAKING with ANTI SKID AVAIL

Question 9

What happens when anti skid nose wheel steering is turned off?

Answer 9

Green hyd sys is shut off

Anti ski deactivated

Yellow sys supplies brakes (alt)

Differential braking is ok (NWS off)

Question 10

Primary and secondary methods of steering

Answer 10

Prim - tiller

Sec - rudder and ap

Question 11

Rudder speed effectiveness graph

Answer 11

+- 6 deg

Up to 40kt same

Slopes off down to 130 (nil)

Question 12

Hand wheel effectiveness graph

Answer 12

+- 75 deg

20-80 (nil)

Question 13

Rudder pedals do not provide steering after what speed?

Answer 13

130kt

Question 14

Steering angle when on tow?

Answer 14

+/- 85 deg

Question 15

When does LGCIU switch over

Answer 15

Switch’s over after 1 complete cycle

Question 16

How many LGCIU triangles feed ECAM SD page?

How many to confirm gear is down

Answer 16

LGCIU 1 and 2

Only one triangle per wheel needed

Question 17

VLO RETRACT

Answer 17

220

Question 18

VLO EXT

Answer 18

250

Question 19

VLE - what is it?

Speeds

Answer 19

Gear extended speed
280 M.67

Door speeds may be less - check ECAM

Question 20

Auto-brake Low

Answer 20

4 sec after spoiler deployment

1.7m/sec 2

Question 21

Medium autobrake

Answer 21

2 sec after spoiler deployed

3m/s2

Question 22

Max autobrake

Answer 22

No delay

Max braking

Question 23

When does decel light come on?

Answer 23

80% decel rate achieved

Question 24

Decel light ‘health warning’

Answer 24

May not come on on contaminated runways

BUT autobrake may still work

Question 25

Autobrake arming conditions

5

Answer 25

Green HYD avail

Anti skid electrically powered

No braking system failures

1 ADIRS functioning

2 Secs

Question 26

RTO logic

Answer 26

Airspeed > 72kt
Thrust Idle

Ground spoilers deploy
Autobrake max

Question 27

What happens during manual braking?

Answer 27

BSCU controls brake pressure proportional to rudder pedal/ brake travel

Question 28

What speed do safety valves operate?

Answer 28

260 kt

Question 29

2 functions of LGCIU

Answer 29

Control sequencing is gear and gear doors

Sends, monitors and receives data from multiple systems

Question 30

Red triangles on ECAM wheel page

Answer 30

Gear in transit

Question 31

The alternate brake system uses:

Answer 31

Y HYD sys + ACC Press

Question 32

When is brake pressure from the hyd Acc available

Answer 32

Alternate braking without anti skid

Question 33

Where does anti skid get reference speed from?

Answer 33

ADIRU 1,2 or 3

Question 34

Alternate braking, green system lost, autobrake is…

Answer 34

Lost

Question 35

Brake gauge shows

Answer 35

Y HYD brake system and brake accu

Question 36

Max tyre speed

Answer 36

195kts

Question 37

Which ADIRS control safety valve for gear >260kt

Answer 37

1 and 3