ATA 32 - Landing Gear

Question 1

How many channels of BSCU ?

Answer 1

2 channels

Question 2

System diagram of brake system ?

Answer 2

Cf diagram

Question 3

Give the 4 brakes mode ?

Answer 3

Normal braking
Alternate braking with A/S
Alternate braking without A/S
Alternate braking without A/S on accumulator

Question 4

How many LGCIU ?

Answer 4

2, 1 master and 1 slave
Change at each retraction cycle (or failure)

Question 5

Which LGCIU controls gear lights on main panel ?

Answer 5

LGCIU 1

Question 6

When does the interlock of landing gear lever is active ?

Answer 6

Landing gear compressed or nose gear not centered

Question 7

Are wheels braked when retracted ?

Answer 7

Yes, main gear wheels are braked automatically during retraction.
Nose wheels are braked with rubber band in the nose gear bay.

Question 8

VLE (speed and mach) ?

Answer 8

280 kt , M 0,67

Question 9

Operation of gear is prevented by safety valve at which speed ?

Answer 9

260 kt

Question 10

Which LGCIU is displayed on ECAM wheel page ?

Answer 10

1 and 2
Each LGCIU represent one triangle

Question 11

If 1 triangle amber and 1 triangle green on ECAM Wheel page, landing gear locked ?

Answer 11

Yes, 1 green is sufficient

Question 12

At what altitude landing memo is displayed ?

Answer 12

2000ft RA and on approach

Question 13

What does mean red arrow of landing gear lever ?

Answer 13

Gear not downlocked while on approach configuration

Question 14

What does each rotation of the gravity extension lever perform ?

Answer 14

1st turn : hydraulic cut off valve
2nd turn: release doors
3rd turn : release gear

Question 15

Is it possible to retract gear after gravity extension ?

Answer 15

No (and gear doors stay open) —> fuel consumption increase

Question 16

NSW maximum deflection values and speed for disconnection for:
-pedals
-handwheel ?

Answer 16

Pedals : 6°, disconnects at 130kt
Handwheel: 75° disconnects at 70 or 80kt

Question 17

Which hydraulic circuit for NSW ?

Answer 17

Old: Green, actuated in return line of nose doors (—> if gravity extension, you loose NSW)
New: Yellow

Question 18

Anti skid works on which information ?

Answer 18

Wheel tachometer vs ADIRS 1 2 3 aircraft reference speed (or fastest wheel if ADIRS failure)
90% —> brake off

Question 19

Anti skid is inhibited at which speed ?

Answer 19

20kt

Question 20

How many full brake applications available if on «Alternate braking without antiskid on accumulator» ?

Answer 20

7 at 1000psi

Question 21

Can autobrake MAX be armed inflight ?

Answer 21

No

Question 22

On which hydraulic circuit works autobrake ?

Answer 22

Green

Question 23

When will autobrake lights be displayed on main panel ?

Answer 23

Deceleration > 80% deceleration rate selected

Question 24

What systems should be operational for autobrake use ?

Answer 24

BSCU
1 ADIRU
2 SECs ( for spoilers )

Question 25

At which ground speed will autobrake work ?

Answer 25

Above 72kt, when spoilers deploy The command for ground spoilers extension is detected, and the wheel speed is above 40 kt, for MAX mode

Question 26

Will autobrake work if ground spoilers not armed ?

Answer 26

Yes, when 1 reverse and other lever at least idle

Question 27

At which temperature of brake a green arc appears on ECAM door page ?

Answer 27

Above 100°C only on the hottest

Question 28

Can the gear be extended above 260 kts if necessary?

Answer 28

Yes , but only manually

Question 29

Nose wheels and main wheels have fusible plugs that prevent the tires from bursting if they overheat. True or False ?

Answer 29

False, not on nose gear

Question 30

The parking brake accumulator is designed to maintain the parking pressure for at least _____ h ?

Answer 30

12h

Question 31

On wheel page of ECAM, Autobrake is flashing green. What does it mean?

Answer 31

Autobrake disengaged

Question 32

When is NSW by the handwheel available ?

Answer 32

Below 70kts, one engine running and towing lever normal position

Question 33

During an approach you get MASTER WARNING and ECAM : "GEAR NOT DOWN", and both radio altimeter failed, what is the reason ?

Answer 33

LG not downlocked, Flaps FULL or 3, RA < 750ft

Question 34

Max braking has been selected, TAKE-OFF being aborted after 72kt, engines in reverse, you have forgotten to arm the ground spoilers ; is the AUTOBRAKE activated ?

Answer 34

Yes because ground spoilers will still be activated

Question 35

After LIFT-OFF, is BRAKES HOT WARNING on ECAM still available ?

Answer 35

No matter what position of the landing gear lever

Question 36

After T/O the LEFT MAIN GEAR SHOCK ABSORBER is stuck in compressed position. Can you retract gear ?

Answer 36

No. Lever is blocked.

Question 37

Which ADR's controls the SAFETY VALVE closure of the GREEN HYDRAULIC SUPPLY of the landing gear when speed > 260 KTS ?

Answer 37

ADR 1 and 3

Question 38

Deflection maximale NSW handweel et rudder pedals ?

Answer 38

75° & 6° function of aircraft speed. Max speed ~70kt and ~130kt respectively