Landing gear Flashcards

1
Q

Which system control landing gear extension, retraction and sequencing of the doors?

A

Two LGCIUs (Landing Gear Control and Interface Units)

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2
Q

When is control switched from one LGCIU to the other?

A
  • In case of failure

- At the completion of one complete gear cycle at retraction.

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3
Q

Which hydraulic system actuates the landing gear and doors?

A

Green

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4
Q

When does the safety valve close?

A

> 260kts or with the MLG on the ground

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5
Q

How many sets of proximity sensors are there?

A

One set for each LGCIU

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6
Q

What happens when turning the gravity extension crank?

A
  • Landing gear hydraulics isolated from green system
  • Door and landing gear unlocked
  • Gravity drops the gear in to extended position
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7
Q

Will the doors close following gravity extension?

A

No

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8
Q

Which LGCIU is connected to the Landing Gear Indicator Panel?

A

LGCIU 1

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9
Q

What is the significance of the red UNLK light?

A

Gear is not locked in the selected position

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10
Q

What is the max nose wheel steering angle?

A

+/-6° from rudder pedals

+/-75° from hand wheel

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11
Q

Which hydraulic system actuate the NWS?

A

Yellow

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12
Q

When does the NWS receive hydraulic pressure?

A
  • A/SKID NWS switch ON
  • Towing lever in normal position
  • One engine running
  • On the ground
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13
Q

Which hydraulic system is used for the normal brakes?

A

Green

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14
Q

Which hydraulic system is used for the alternate brakes?

A

Yellow, backed up by hydraulic accumulator

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15
Q

Can the MAX autobrake setting be used on ground and in flight?

A

Only on ground

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16
Q

When does the BSCU change channel?

A

At each down selection of landing gear

17
Q

What failure modes can the brakes revert to?

A
  • Alternate brakes with antiskid
  • Alternate brakes without antiskid
  • Alternate brakes without antiskid on accumulator
18
Q

What is compared with the wheel tachometer for antiskid protection?

A

Aircraft reference speed from ADIRU 1,2 or 3

19
Q

Can the auto brakes be used with antiskid inoperative?

A

No

20
Q

When is autobrake activated?

A

When a command for ground spoilers is detected

21
Q

How can the autobrake system be manually disarmed/deactivated

A
  • Ground spoilers retract
  • Pushbutton off
  • Deflection of brake pedal
22
Q

Which hydraulic system provides pressure for the alternate brakes?

A

Yellow

23
Q

Can auto brakes be used with alternate brakes?

A

No

24
Q

Do alternate brakes need to be selected manually?

A

No

25
Q

How many full brake applications are available on accumulator pressure?

A

7

26
Q

What is the brake pressure limited to when using alternate brakes without antiskid?

A

1000psi

27
Q

When is brake pressure indicated on the BRAKES and ACCU PRESS indicator?

A

Only when the yellow system controls the brake pressure

  • Alternate braking activated
  • Parking brake applied
28
Q

When does the DECEL light illuminate?

A

When actual deceleration rate is >80% of commanded

29
Q

Which hydraulic system provides pressure to the parking brake?

A

Yellow system or accumulator

30
Q

For how long will the accumulator maintain parking brake pressure?

A

Minimum 12h

31
Q

Will the A/SKID NWS switch position affect the normal brakes?

A

Yes. Switch off will also deactivate the normal brakes

32
Q

What is VLE?

A

280 kts

33
Q

What is the effect of initiating a rejected takeoff at low speed (<72kts)?

A

Autobrakes will not activate due to no spoiler deployment <72kts.

34
Q

What is Vlo?

A

Extension: 250kts
Retraction: 220kts