Landing Gear

Question 1

What is the function of the two Landing Gear Control and Interface Units (LGCIU)?

Answer 1

control the extension and retraction of the gear and the operation of the doors. They also supply information about the landing gear to ECAM for display and send signals indicating whether the aircraft is in flight or on the ground to other aircraft systems.

Question 2

When does the red arrow in the LND panel illuminate?

Answer 2

if the landing gear is not locked down when the aircraft is in the landing configuration below 750 feet RA. Also, a red warning appears on ECAM.

Question 3

What happens if your airspeed is 280 knots and you place the Landing Gear lever to DOWN?

Answer 3

Nothing, When the aircraft is flying faster than 260 kt, a safety valve automatically cuts off hydraulic supply to the landing gear system.

Question 4

What do the red UNLK lights indicate?

Answer 4

the gear is not locked in the selected position.

Question 5

What controls and manages all braking functions?

Answer 5

In normal operation, a dual channel Brake and Steering Control Unit (BSCU) controls normal braking and anti-skid.

Question 6

What happens when you switch the A/SKID & N/W STRG to OFF?

Answer 6

The yellow hydraulic system supplies pressure to the brakes.
• Anti-skid is deactivated. The pilot must refer to the triple indicator to limit brake pressure and avoid locking a wheel. However, a 1000-psi pressure limiting valve helps prevent wheel lock up.
• Nosewheel steering is lost
• Differential braking remains available through the pedals
• Triple indicator displays yellow system brake pressure
• The BSCU is depowered

Question 7

What are the four modes of braking?

Answer 7

• Normal braking
• Alternate braking with anti-skid
• Alternate braking without anti-skid
• Parking brake

Question 8

Which hydraulic systems provide pressure to the brakes?

Answer 8

normal system uses green hydraulic pressure
alternate system uses the yellow hydraulic system backed up by the hydraulic
accumulator

Question 9

When do the Autobrakes activate on landing if armed?

Answer 9

• the command for ground spoilers extension is detected for LO and MED mode

Question 10

What does the AUTO BRK green DECEL light indicate?

Answer 10

Comes on green when the actual deceleration is 80% of the selected rate.

Question 11

What is the difference between LOW and MED AUTO BRK?

Answer 11

• MED mode sends progressive pressure to the brakes 2 seconds after the ground spoilers deploy in order to decelerate the aircraft at approximately 10 ft/s².
• LO mode sends progressive pressure to the brakes 4 seconds after the ground spoilers deploy, in order to decelerate the aircraft at approximately 6 ft/s².

Question 12

What is the Takeoff setting for Auto Brakes?

Answer 12

MAX mode is normally selected for takeoff.

Question 13

What will cause the MAX AUTO BRK to activate on a RTO?

Answer 13

• the command for ground spoilers extension is detected, and the aircraft speed is above
40 kts, for MAX mode
Therefore, if the aircraft makes a rejected takeoff when its speed is under 72 kts, the MAX automatic braking will not activate because the ground spoilers will not extend.

Question 14

If you lose Green hydraulic pressure will you have autobrakes?

Answer 14

No, in Alternate Braking the autobrake is inoperative

Question 15

Is Anti-skid available with Alternate Brakes?

Answer 15

Possibly, Depends on the failure. There are two types of Alternate Braking with and without Anti-skid.

Question 16

How many brake applications are available with accumulator pressure?

Answer 16

Accumulators are designed to supply at least seven full brake applications.

Question 17

What does the BRAKES & ACCU PRESS triple indicator indicate?

Answer 17

Brake pressure is only indicated when the yellow hydraulic system controls the brake pressure.

Question 18

How do we charge the yellow system accumulators?

Answer 18

With yellow system hydraulic pressure.

Question 19

When brake accumulator pressure is low, how is it recharged?

Answer 19

Yellow accumulators can be pressurized by pressing the yellow electrical pump switch.

Question 20

If the ACCU PRESS indicator is low and an external walk-around is to be completed, what should you do?

Answer 20

If the brake accumulator pressure is low with no Yellow hydraulic pressure, the crew may obtain ground clearance to clear the area around the aircraft and then turn on the Yellow Elec Pump to pressurize the accumulator.

Question 21

How do you verify the Parking Brake is set?

Answer 21

To verify the parking brake is set, the crew should notice that the ECAM memo page will display the message “PARK BRK” and the BRAKES and ACCUM PRESS gauge will display pressure.

Question 22

If the parking brake is activated and no yellow hydraulic or accumulator pressure is available, do you still have available braking?

Answer 22

The normal braking system can be applied via the brake pedals as long as green hydraulic pressure is available.

Question 23

What 3 things occur when you turn the Gravity Gear Extension hand-crank?

Answer 23

• isolates the landing gear hydraulics from the green hydraulic system
• unlocks the landing gear doors and the main and nose main gear
• allows gravity to drop the gear into the extended position

Question 24

How many turns of the Gravity Gear Extension handcrank does it take to lower the gear manually?

Answer 24

To put the landing gear down by gravity, the Flight Crew must pull the gear crank out, then turn it clockwise for 3 turns.

Question 25

What hydraulic system supplies nose wheel steering?

Answer 25

The yellow hydraulic system

Question 26

The steering hand wheels can steer the nose wheel up to how much in each direction?

Answer 26

The handwheel can turn the nosewheel up to 75° in either direction.

Question 27

When using the rudder pedals for steering, when does the steering angle begin to reduce?

Answer 27

Beginning when the aircraft

reaches 40 kts and reduces to zero by 130 kts.