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Z A320 Systems > Stage 4 Landing Gear > Flashcards

Stage 4 Landing Gear Flashcards

1
Q

What does the landing gear system include?

A

1) Two inboard retracting main landing gear

2) One forward retracting nose gear

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2
Q

What system controls the landing gear?

A

2 LGCIU (Landing Gear Control and Interface Units)

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3
Q

What are the components of the MLG?

A

1) Retraction actuator
2) Downlock Actuator
3) Lock Stay
4) Safety Pin
5) Downlock Springs
6) Shock Absorber

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4
Q

What are the components of the NLG?

A

1) Retraction actuator
2) Downlock Actuator
3) Safety Pin
4) Downlock Springs

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5
Q

When doe the LGCIU’s switch?

A

1) Between gear cycles

2) When one fails

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6
Q

What speed does the landing gear hydraulic lock activate?

A

> 260kts

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7
Q

Can the crew reset the emergency extension system inflight?

A

Yes. Provided green pressure is available

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8
Q

What inputs from LG does the LGCIU get?

What other systems send imputs to LGCIU?

A

1) Locked up or down
2) Shock Absorber compression
3) Gear door position
4) bogie alignment
Other systems are cargo doors and SFCC

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9
Q

Goes LGCIU monitor SFCC fails?

A

No

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10
Q

What LGCIU operates the LDG Panel in the central display?

A

LCGIU 1

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11
Q

What is the case if one UNLK red light remains on the LDG panel?

A

Check the wheel SD page. One green triangle on each gear is enough proof for gear down locked

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12
Q

Describe the process that happens after LDG Gear selector lever is selected UP?

A

1) Gear door open

2) Normal Brake system brakes the NLG as doors close

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13
Q

Does ABY A/C have NLG rubbing strips in the wheel wells?

A

no

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14
Q

What is the function of the LG red arrow ong LDG Panel?

A

Lights up when the gear is not downlocked when A/C is in LDG config

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15
Q

How are crew prevented from selecting gear up on ground?

A

Interlock mechanism locks the lever when the MLG is not compressed or NLG not centered

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16
Q

What does the Gravity GEAR EXTN do?

A

Shuts off HYD pressure to the LDG system and depressurizes it

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17
Q

Wheel page: Meaning of GREEN, RED and no triangle? and if LGCIU fails?

A 
One LGCIU detects:
LG Down
LG in transit
LG Uplocked
amber corses if LGCIU fails
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18
Q

What message appears on ECAM if LDG gear up lock is engaged when LDG gear is down locked

A

UP LOCK

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19
Q

What does the L/G CTL amber caution mean on the WHEEL page?

A

If landing gear position and selector handle do not agree

20
Q

What controls the NWS?

A

Yellow Hydraulic operates cylinders by command of the BSCU

21
Q

What is the maximum NWS angle from the rudder and till when does it go down to zero? Tiller input?

A

1) 6 degrees reduces to zero by 130 knots

2) 75 degrees till 80 knots

22
Q

When is the NWS system pressurized? (4 items)

A

A/Skid and NWS switch is on
Towing control lever is on
one engine is running
A/C on the ground

23
Q

What does the steering system automatically do after liftoff?

A

centers NLG

24
Q

What controls the normal braking system and anti-skid?

A

Dual-Channel BSCU (braking and steering control unit)

25
Q

What controls the alternate braking system?

A

ABCU

26
Q

What modes may the braking system revert to in case of failures?

A

1) Alternate with Antiskid
2) Alternate without antiskid
3) Alternate without antiskid on Accumulator

27
Q

When do the channels of the BSCU alternate?

A

With each successive DOWN gear selection or if either fails

28
Q

What is installed on the main gear tires to prevent tire bursts?

A

Fusible plugs

29
Q

At what speed is antiskid not active?

A

below 20kts

30
Q

How does anti-skid operate?

A

It maintains maximum brake efficiency by keeping the wheels at an impending skid. (when skid is detected the brakes are released automatically)

31
Q

From where is the normal reference speed input given to the anti-skid system? And in failure?

A

The ADIRU. The maximum speeds in failure

32
Q

What is the purpose of auto brake? (2 items)

A

Reduce RTO distance

Maintain a preselected deceleration rate during landing to reduce the pilot workload and PAX comfort

33
Q

What are autobrake arming conditions? What does it need to activate?

A

1) Green Pressure available
2) Anti-skid available
3) No brake fails
4) At least one ADIRU
To activate: Two SEC’s

34
Q

Can you arm the auto brake with PRK BRK on?

A

Yes

35
Q

When does the auto brake activate?

A

1) LO/MED: When the command for ground spoilers is detected (abv 72 knots)
2) MAX: When wheel speed is above 40 and ground spoilers detected

36
Q

How is Autobrake disarmed?

A

Manual application
Pressing the same auto brake pb
After T/O or Touch and Go

37
Q

When is Alternate with anti-skid used by the system?

A

Whenever the green pressure system is insufficient

38
Q

Are the same pilot brake inputs interpreted equally in both Normal and ALTN braking?

A

No, initial input on the ALTN brakes produces more brake action

39
Q

When does the ATLN braking not have Anti-skid?

A

1) Only Accumulator braking

2) Anti-skid fail (electric, BSCU fail, NWS off )

40
Q

How many applications can the accumulator provide?

A

7 full applications

41
Q

What powers the PRK Brake? And what happens if the main supplier is not available when PRK BRK is selected?

A

Yellow system. The green system will actuate the brake pedals if there is no yellow pressure

42
Q

How long can the accumulator maintain parking pressure?

A

at least 12 hrs

43
Q

Is the automatic limiting of brake pressure to 1000PSI by the system while in ALTN brake active when anti-skid is inoperative?

A

No

44
Q

When does the DECEL Light come on in Auto Brake panel?

A

When 80% of the deceleration is achieved

45
Q

What is the condition for the BRK fans to turn ON?

A

If the main left LDG is down and locked

46
Q

At what brake temperature does the WHEEL page green arc light up? When is it amber?

A

100 C

300 C

Z A320 Systems (30 decks)

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