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COAS 2022 > 32 Landing Gear > Flashcards

32 Landing Gear Flashcards

1
Q

What is displayed at the top of the WHEEL SD page?

A

Spoilers

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2
Q

How many green triangles are needed per gear to confirm locked down?

A

One (one LGCIU needs to confirm green triangle)

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3
Q

What does two amber XX’s mean in place of a green triangle on the WHEEL SD page?

A

One LGCIU has failed

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4
Q

What does an amber X mean in place of an arrow for spoilers?

A

Spoiler position not valid

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5
Q

When does a green arc appear over brake?

A

When one brake >100degC

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6
Q

When does an amber arc appear over brake?

A

When one brake >300degC

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7
Q

When does N/W STEERING appear in amber on the WHEEL SD page?

A

System failure, or
Both BSCUs fail, or
Y HYD SYS LO PR, or
A/SKID + N/WHEEL STRNG pb off

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8
Q

Maximum brake temperature for take off without any brake fans? With brake fans?

A

300degC without fans, 150degC with fans

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9
Q

When do the fusible plugs melt in the tyre? Why do they do this?

A

When brakes reach 800degC to prevent tyre burst

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10
Q

Maximum speed with landing gear extended? VLE

A

280kt/M0.67

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11
Q

Maximum speed for landing gear extension? VLOe

A

250kt/M0.60

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12
Q

Maximum speed for landing gear retraction? VLOr

A

220kt/M0.54

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13
Q

Maximum tyre speed?

A

195kts

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14
Q

Maximum wiper operating speed?

A

230kts

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15
Q

Maximum window open speed?

A

200kts

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16
Q

Maximum speed with one tyre deflated?

A

7kts

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17
Q

Maximum speed with two tyres deflated (same side)?

A

3kts

18
Q

What speed is tiller disabled

A

80kts

19
Q

What speed does rudder pedal disconnect from NWS?

A

130kts

20
Q

Various types of braking?

A

Normal (G)
Alternate (with anti skid) (Y)
Alternate (max 1000psi) (Y)
Hydraulic accumulator pressure (Y)

21
Q

Why limited to 1000psi?

A

Prevent wheel locking

22
Q

How many full braking applications on accumulator braking?

A

7

23
Q

Describe auto brake deceleration modes

A

Low - spoiler activation + 2s @ 2/s
Med - spoiler activation + 2s @ 3m/s
Max - when thrust levers are closed above 72kts

24
Q

Autobrake arming conditions

A

Green hydraulics
Anti skid
1 x ADR

25
Q

When will DECEL light come on?

A

When 80% braking achieved

26
Q

How does anti skid function?

A

Maintains wheel speed just above impending skid.
Disabled below 20kts
Compares wheel speed to aircraft speed and if not equal releases the brakes

27
Q

Max tyre speed

A

195kts

28
Q

QRH procedures for gear/brakes?

A

Loss of braking
Gravity gear extension
Landing with abnormal gear
Asymmetric braking

29
Q

When are auto brakes available?

A

Normal Brakes

30
Q

The landing gear panel on the middle console is connected to which LGCIU?

A

LGCIU 1

31
Q

How many degrees of nose wheel steering do we get from:

Rudder pedals
Hand wheels

And at what speed to we have none?

A

Rudder pedals
+- 6 progressively less to 130kts

Hand wheel
+-75 progressively less to 80kts

32
Q

On the ECAM
We see NW STRG DISC in green meaning the selector is in the towing position.
When does this memo turn amber?

A

If one engine is running

33
Q

Below what speed does anti skid deactivate ?

A

20kts
Careful tasting

34
Q

How does anti ski work?

A

The speed of each main wheel is measured using a tachometer and is compared to the aircraft reference (ADIRU) speed.
If the speed of the wheel goes below 0.87 x ref speed then it is skidding and anti skid kicks in.

35
Q

Above what speed to ground spoilers extend?

A

72kts
Therefore during an RTO autobrake wont kick in unless above this speed!

36
Q

When does auto brake kick in?

A

Ground spoiler extension

37
Q

When is auto brake activated?

A

When ground spoilers deploy

38
Q

Why is brake pressure on alternate without anti skid limited to 1000psi?

A

To stop wheel locking and tyre burst

39
Q

Why is the break temp limit 300 degrees?

A

Because that temp ensures the hydraulic fluid will not ignite in the wheel well.

40
Q

When does the LDG GEAR safety valve operate?

A

When the aircraft is flying faster than 260 kt, a safety valve automatically cuts off hydraulic supply to the landing gear system. Below 260 kt, the hydraulic supply remains cut off as long as the landing gear lever is up.

41
Q

What do the LGCIU’s receive position information from?

A

Landing gear
Cargo door
Landing flap systems

COAS 2022 (28 decks)

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