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Technical > Landing Gear > Flashcards

Landing Gear Flashcards

1
Q

When do LGCIUs swap?

A

After full ext/ret cycle- after retraction

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2
Q

Which ADRs provide speed data to the safety valve?

At what speed is it locked?

A

ADR1+3

260kt

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3
Q

What valve is controlled by the Gravity Extension handle?

What aids cranking into locked position?

Do doors remain open? Can the system be reset?

A

Cut-off valve

Locking springs

Remain open, system can be reset with G HYD operative (normally training)

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4
Q

Four gear position data points?

Three data points re: cargo doors received by LGCIU?

How many flap disconnect proximity switches are there?

A

Up/down locked
Shock absorbers compr/extended
Doors open / shut
Bogies aligned / not

Valve
Shaft
Handle

Four

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5
Q

Can LGCIU 1 show position information on the three lights if failed?

A

So long as still electrically powered.

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6
Q

Which braking system stops wheel spin during retraction?

What stops wheel spin for NW gear?

A

Normal braking system

Brake band

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7
Q

Can the landing gear handle be physically moved up on the ground?

What are the conditions?

Which valves does the landing gear handle control?

What does the red arrow on the lever mean?

A

No, interlock system prevents lever movement.

Linked to shock absorber position and whether NW is aligned

Selector valves

Not downlocked

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8
Q

Wheel SD page
LG CTL amber?
UPLOCK amber?
Red triangle?
Two amber crosses?

A

Position disagrees with lever

Uplock engaged when gear is downlocked

In transit

LGCIU failed

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9
Q

What powers / controls the hydraulic steering cylinder?

What are the four conditions for pressurisation?

A

Yellow Hydraulic
BSCU (either channel)

  • NWS pb ON
  • Towing lever normal (pin)
  • One engine running
  • On ground
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10
Q

Max steering angle via the pedals?
Tiller?
By what speed do they have no effect?

What is the steering angle when lever in towing mode?

What centralises the steering on retraction?

A

6º (0º by 130kt)
75º (0º by 80kt)

95º

Internal cam

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11
Q

When is NW STRG DISC green and amber?

A

Green: pin and engines OFF
Amber: pin and 1 engine ON

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12
Q

In Alternate Braking with Antiskid, which computer controls?

A

Braking: ABCU
Antiskid: BSCU

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13
Q

What three functions does the BSCU have?
When does it swap channel?

A
  • Checks residual brake pressure
  • Monitors brake temperature
  • Provides wheel speed to other systems

Swaps channel each time gear down.

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14
Q

When do fusible plugs blow?

A

900ºC
Same temperature for maintenance action on brakes

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15
Q

When does the antiskid kick in?
When does it deactivate?
Which ADIRUs are used?
What happens if ADIRUs fail?

Can antiskid be used with the alternate braking on Y system?

A

When wheel speed reaches 0.87 of ground speed
20kt
All 3 ADIRUs
If all fail, reference speed is max main landing gear wheel speed

Yes

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16
Q

What 3 conditions needed for Autobrake to work?

How many ADIRU, SEC?

When does autobrake engage?

Is autobrake still armed when spoilers retract?

A
  • Green only
  • Antiskid powered
  • No braking failure
  • One ADIRU
  • Two SEC

With spoiler deployment
MAX only kicks in over 40kt

Yes, still armed

disarms after TO or Touch and Go

17
Q

What is braking pressure limited to when Alternate without Antiskid?

How many accumulator applications are available?

A

1000 PSI- automatically by ABCU
Avoids locking / burst

7 full applications

18
Q

Which hydraulic system does the parking brake use?

How long will it hold if using accumulator pressure only?

How can the accumulator be pressurised?

A

Yellow

Minimum 12 hours

Press Y ELEC pump

19
Q

Do you need to switch the NWS/ANTISKID sw to swap braking systems?

Is differential braking still available with alternate braking?

What system is shown on the triple indicator?

A

No, automatic transfer to Y ALTN braking if G lost

Yes, still avail

Y system only
i.e. alternate or parking brake
measured downstream of alternate servos

20
Q

What is deceleration rate with LO / MED? When will bulb light?

What do the two numbers mean next to ANTISKID on the WHEEL SD?

A

LO: 2 m/s²
MED: 3 m/s²
80% of commanded braking

May not illuminate in slippy conditions due to antiskid taking over, but still braking

Refer to the two BSCU channels

21
Q

When does a green arc appear over brake temperatures? An amber ark?

A

Hottest when any exceed 100ºC
Amber 300ºC (max for TO without fans- 150 without)

22
Q

What does the arrow next to the ACCU label on WHEEL pg mean?

A

Down if being pressurised
Up if supplying braking
No arrow if low pressure (amber)

23
Q

Limitations- braking with high thrust?

A

Not designed for it. If performing a maintenance procedure, should be ready to reduce to IDLE if movement detected.

24
Q

Max speeds with damaged / deflated tyres?

A

7kt (one per gear)
3kt (two per gear)
30º NWS

Technical (20 decks)

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