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A330/350 Systems > A350 Landing Gear > Flashcards

A350 Landing Gear Flashcards

1
Q

Which system controls the landing gears?

A

Landing Gear Extension and Retraction System (LGERS)

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2
Q

In which direction does the nose ldg gear retract?

A

Forward

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3
Q

Which doors on the nose ldg gear are open and which are closed when the ldg gear is extended?

A
  • Front are closed (hydraulically actuated)

- Rear are open (mechanically linked)

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4
Q

What is the purpose of the bogie pitch trimmer?

A
  • To keep the bogie in the correct position for ldg gear retraction
  • To dampen bogie movement
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5
Q

Which hydraulic system operates the bogie pitch trimmer on the -900 and on the -1000?

A
  • Green (always pressurised even if ldg gear retracted) (-900)
  • Own hydraulic system (-1000)
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6
Q

Which hydraulic system operates the nose ldg gear?

And the main ldg gear?

A
  • Yellow (with alternate power pack as backup)

- Green (with alternate power pack as backup)

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7
Q

When are the hydraulic lines to the landing gears pressurised?

A
  • only during ldg gear extension and retraction

- isolation valve shuts it down once extended/retracted

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8
Q

How is the alternate power pack powered?

A
  • Electrically by two elec pumps
  • Convert elec power to hydraulic power
  • Elec pumps are powered by two elec supplies
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9
Q

When does the ldg gear ctrl system switch?

A
  • When the active one fails

- When ldg gear lever is selected up.

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10
Q

Roughly how long does it take to extend/retract the nose ldg gear?

A

20sec

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11
Q

Is hydraulic power used during gear gravity extension?

A
  • Yes, by the alternate power packs

- To open the doors, (stay open)

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12
Q

What is the maximum time for gravity extension sequence?

A

90sec

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13
Q

Can the ldg gear gravity switch be reset in flight?

A

No, only on ground by maintenance

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14
Q

What are the braking modes?

A
  • Normal Braking
  • Alternate Braking
  • Emergency Braking
  • Park Brake
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15
Q

Which wheels are supplied by which hydraulic system in the A350-900/-1000?

A

A350-900:

  • Front two (1,2,3,4)YELLOW
  • Rear two (5,6,7,8) GREEN

A350-1000:

  • Front (1,2,3,4,6,8) YELLOW
  • Rear (5,7,9,10,11,12) GREEN
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16
Q

Where does hydraulic power come from during alternate braking?

A

Accumulators

17
Q

How are the accumulators re-inflated?

A
  • ACCU REINFLATE pb

- Automatically when engines are running

18
Q

How many brake applications are available in emergency braking?

A

6 full brake applications (then still enough for park brake)

19
Q

Summarize the braking modes, power supply, wheel control, and available functions?

A

NORM:

  • Y,G hydraulics
  • A/BRK and A/SKID available
  • Wheels controlled indicidually

ALTN:

  • Accumulators
  • A/BRK and A/SKID available
  • Lost below 1600psi (1800psi)
  • Wheels controlled in pairs

EMER:

  • Accumulators
  • No A/BRK and A/SKID
  • Only brake pedals
  • Brake pressure limited to 1130psi (1250psi)
  • Only 6 applications
  • Wheels controlled in pairs

PARK BRK:

  • Accumulators
  • Max accu pressure
  • Risk of tyre burst
  • Wheels controlled in wheel groupsy
20
Q

What is the target speed of the A/BRK system?

A

10kts, approx 60m before selected exit

21
Q

How is the A/BRK disarmed/deactivated?

A
  • Pressing brake pedals
  • Pushing instinctive pb
  • Pressing A/BRK pb
  • Setting park brake
  • Ground spoilers retract
  • A/BRK arming conditions lost
22
Q

At what speed does the RTO mode activate?

A

Above 40kts ground speed

23
Q

What are some advantages of A/SKID?

A
  • Reduced ldg distance, accel stop dist.
  • Reduced tyre wear
  • Prevents tyre burst
  • Aquaplaning protection
24
Q

When would you operate the A/SKID disconnection switch?

A

Only in the event of a “ LOSS OF BRAKING” procedure.

25
Q

On the A350, does the NWS deactivate when the A-SKID sw is selected to OFF?

A

No, it’s a separate system and remains active

26
Q

Why might there be a difference in accumulator pressure indications on the instrument?

A

G and Y accumulators are in two different locations and might be affected by different temperatures, therefore affecting the indication on the gauge.

27
Q

If the accumulator pressure indicator shows that the pressure is in the white arc, what does this mean?

A
  • Sufficient pressure to set park brake and start engines

- Insufficient pressure for engine tests

28
Q

What braking mode is available when the accumulator pressure indicator shows a pressure between the 1.4 and 1.6 mark?

A
  • Alternate or Emergency braking mode available

- No A-SKID

29
Q

Which hydraulic system operates the NWS?

A

Yellow

30
Q

What is the HCF?

A
  • Heading control function
  • Max of 3 degrees of NWS input to maintain aircraft on centerline of taxiway when steering tiller released
  • Below 50kts
  • Inhibited on takeoff
31
Q

If the captain applies rudder and the FO also applies rudder, will the command be doubled?

A

No as the rudder pedals are connected mechanically

32
Q

If the captain applies steering tiller input and the FO also applies steering tiller input, will the command be doubled?

A

It is algebraically added

33
Q

What is the maximum NWS angle using the rudder pedals?

A

6 degrees decreasing with speeds above 100kts

34
Q

What is maximum angle of NWS using the steering tiller? And on the -1000?

A

72 degrees decreasing with speeds above 30kts (75 degrees)

35
Q

When the tiller disconnect pb is pressed what is disconnected?

A
  • NWS from rudder pedals

- HCF

36
Q

Which hydraulic system does the backup steering function use?

A

Green

37
Q

How does the backup steering function operate?

A

It converts steering inputs from rudder pedals and tiller to differential braking commands on the main ldg gear.

38
Q

When does the backup steering function not activate?

A
  • During taxi out
  • After an RTO
  • One engine inop
  • One or more green brakes not available in normal mode
  • Nose wheel not free to swivel

A330/350 Systems (8 decks)

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