DSC Landing gear

Question 1

What controls the landing gear ?

Answer 1

2 LGCIU (landing gear control and interface unit)

Question 2

What is the switch between LGCIU happening ?

Answer 2

After the full RETRACTION of the landing gear

Question 3

When is the landing gear safety valve active ?

Answer 3

Speed more than 260kt with data from ADR1 or ADR3

Question 4

What HYD power the landing gear ?

Answer 4

Green

Question 5

To which LGCIU is connected the Landing gear indicator panel ?

Answer 5

LGCIU 1

Question 6

From which LGCIU does the GPWS receive data ?

Answer 6

LGCIU 1

Question 7

When does the red arrow next to the landing gear lever illuminates ?

Answer 7

when A/C in landing config and gear not down lock

Question 8

What HYD system power the NWS and which computer controls it ?

Answer 8

Yellow
Controlled by the BSCU

Question 9

When does the NWS stop being connected to the rudder ? Hand wheel ?

Answer 9

above 130kt
Above 80kt

Question 10

What are the brakes systems on the A/C ?

Answer 10

Normal brakes => Green HYD
alternate brakes => Yellow HYD

Question 11

When does the switch between the BSCU channels occur ?

Answer 11

When the landing gear is selected DOWN

Question 12

What controls the antiskid ?

Answer 12

BSCU

Question 13

What controls the alternate braking ?

Answer 13

ABCU (alternate braking control unit)

Question 14

What are the different type of alternate braking available and how are they controlled ?

Answer 14

• Alternate braking with antiskid (braking controlled by ABCU and antiskid by BSCU)
• Alternate braking without antiskid (braking by ABCU)
• Alternate braking without antiskid on accumulator (ABCU)

Question 15

What info is used for the antiskid ?

Answer 15

Ref speed from BSCU
BSCU gets speed from ADIRS 1,2 or 3

Question 16

What computers are required for the autobrakes to work ?

Answer 16

At least two SEC operative

Question 17

What do you need to be able to arm the autobrakes ?

Answer 17

• green HYD
• Antiskid
• at least one ADIRS
• no failure in braking system

Question 18

What is the delay after the spoiler for the autobrake to start working ?

Answer 18

2sec

Question 19

What is the target deceleration rate for the autobrakes LOW, MED?

Answer 19

2 m/s² low
3 m/s² Med

Question 20

When will the autobrake trigger on landing ?

Answer 20

When ground spoiler deploy so:
- Ground spoiler armed: Both main gear on ground and both thrust lever idle or one at reverse other below MCT
- Ground spoiler not armed: both main gear on ground and reverse on at least one and other below MCT

Question 21

What HYD system power the park brake ?

Answer 21

Yellow

Question 22

How long can the park brake be maintain for ?

Answer 22

12h

Question 23

What are the main operational consequences of loosing LGCIU 1 + 2 ?

Answer 23

Loss of AP 1+2 and ATHR => Raw data
CAT I
No gear retraction due gravity extension => Fuel burn
No reverser

Question 24

What happens for the gear doors with the gravity extension ?

Answer 24

they remains open

Question 25

What is the approximate increase in fuel brun with the gear extended ?

Answer 25

180%

Question 26

When do you expect to see the DECEL light when using autobrake

Answer 26

when 80% of the selected rate is achieved

Question 27

When might you not see the DECEL light on landing with autobrake ?

Answer 27

Decel rate not achieved due slippery rwy

Question 28

What information is shown on the triple brake indicator ?

Answer 28

pressure of the Yellow HYD when alternate braking activated or on ground with park brake

Question 29

At what speed is the landing gear safety lock active ?

Answer 29

Speed above 260kt, landing gear cannot be operated