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M11 > 11.13 Landing Gear > Flashcards

11.13 Landing Gear Flashcards

1
Q

Which indication is given in most aircraft when the landing gear is all retracted and locked?

A

All landing gear lights are out

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2
Q

Which cockpit indication is normally given when the landing gear is all extended and locked?

A

A green light for each leg

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3
Q

When are the landing gear doors normally open?

A

During extension and retraction

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4
Q

When the landing gear free fall system is used, how are the landing gear doors closed?

A

They remain open

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5
Q

What typical systems can proximity switches be used with?

A

Flight controls and landing gear

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6
Q

What type of proximity switches are used in aircraft?

A

Reed and electric

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7
Q

What is a micro switch?

A

A switching device that can open and close circuits at high speeds

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8
Q

Jet aircraft use nose wheel landing and not tail, why?

A
  • nose gear gives better directional stability
  • prevents nosing over during break applications
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9
Q

The main landing gear retracts inboard into the fuselage, why?

A

Because only the fuselage has sufficient space for wheels

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10
Q

What are the characteristics of the nose landing gear on jet aircraft?

A
  • has no breaks and extends with the air stream
  • is steerable
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11
Q

Why are landing gear extension/ retraction systems needed?

A

To decrease drag therefore reducing fuel consumption

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12
Q

On commercial jet aircraft the wheel well doors are closed when?

A

At all times apart from extension and retraction

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13
Q

What is the main purpose of the shock strut?

A
  • To support aircraft in the ground
  • absorb shock on landing
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14
Q

The main function of the torsion links on the main gear is to?

A

Allow the inner cylinder to move yo and down in the outer cylinder but NOT to rotate.

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15
Q

What is the purpose of the torsion link damper?

A

Counteract wheel shimmy

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16
Q

What does the drag strut do?

A

Stabilises the shock

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17
Q

On most aircraft the main landing gear is kept in a retracted position during flight by what?

A

An up lock roller and an engaged up lock hook

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18
Q

When a shock strut is compressed the increase in pressure causes what?

A

The volume in gas to decrease

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19
Q

What is the function of the wiper ring?

A

Keep all unwanted material out of the shock strut whilst compression takes place

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20
Q

Where are dynamic seals used?

A

To seal the inner cylinder to the gland housing of areas with linear or rotational movement

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21
Q

Why do aircraft have nose wheel landing gear configuration?

A

Gives directional stability during take off and landing

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22
Q

On four wheel configuration the truck beam has a tilt mechanism to?

A

Bring the truck beam to certain position before retraction because wheel well has a restricted space

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23
Q

What is the tilt mechanism operated by?

A

A hydraulic truck positioning actuator

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24
Q

How do you set a mechanical parking brake in a Boeing aircraft?

A

Depress the break peddle then pull parking brake lever

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25
Q

What is the purpose of the anti- skid system?

A

Protects the tyres and gives more effective breaking

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26
Q

During breaking the main wheel speed is…?

A

Slower than the aircraft speed

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27
Q

During approach what does the anti- skid system do?

A

Sends full release signals to the anti skid valves

28
Q

What is the function of the auto break system?

A

To stop the aircraft automatically

29
Q

What force and support does the drag strut on a nose landing gear take?

A
  • Takes longitudinal forces
  • gives primary support for down/locked position
30
Q

What does the rudder pedals steering interconnect mechanism connect together?

A

The rudder pedals to the nose wheel steering when the aircraft is on ground

31
Q

Where is a lockstay found and what is the purpose?

A

It’s attached to the drag strut and controls alignment of folding strut

32
Q

What do the three red lights of landing gear indicator mean?

A

That the gear is not locked

33
Q

What is the purpose of the ramps on the main gear door?

A

Make sure the main door doesn’t interfere with gear during freefall extension

34
Q

When gear down, pressure is appplied to open port of the door actuator and what else?

A

Lock port of the down lock actuator

35
Q

After an alternate (emergency) landing gear extension, the landing gear doors….?

A

Remain open

36
Q

To engage the operation of the landing gear control handle what must you do first?

A

Pull the handle out of the decent first

37
Q

During breaking what happens to kinetic energy?

A

Kinetic energy is converted to heat energy

38
Q

What are most aircraft wheels made from?

A

Aluminium alloy

39
Q

Where is the inflating valve installed?

A

On the outboard half of the wheel

40
Q

Where are the brakes installed?

A

On the inboard hand of the main gear wheels

41
Q

What does the heat shield inside the wheel prevent?

A

The brake heat from damaging the wheels and tyres during normal braking

42
Q

What is the purpose of the fuseable plug?

A

Automatically release tyre pressure at certain temperature levels

43
Q

If the size of a tyre is 960 x 340 x 14, what does it mean?

A
  • outside diameter = 960mm
  • section width = 340mm
  • rim diameter = 14 inches
44
Q

Which types of tyre is used on a propeller aircraft?

A

Type 3

45
Q

All aircraft brakes are what?

A

Disc brakes

46
Q

What is the torque tube break connected to?

A

The stators

47
Q

Which component changes hydraulic pressure to break force?

A

The pistons

48
Q

If a break has 7 normal braking pistons how many overall pistons are ther?

A

14
7 for normal braking and 7 for alternate braking

49
Q

The centre ribs are worn and shoulder ribs are still quite deep, what does this mean?

A

The tyre is over inflated

50
Q

How often is the pressure checked?

A

Before each flight or each day

51
Q

What are aircraft tyres inflated with?

A

Nitrogen

52
Q

What does the heat pack in the brake discs consist of?

A

Steel or carbon rotors or stators

53
Q

Which brakes can withstand higher temperatures?

A

Carbon brakes

54
Q

Why do large heavy aircraft need power breaks?

A

Because the pilot cannot apply sufficient high brake pressure

55
Q

What transmission is used between brake pedal and brake metering valve?

A

Cable or hydraulic transmission

56
Q

What does differential braking mean?

A
  • the left brake pedal controls the left brake
  • the right brake pedal controls the right brake
57
Q

What does the in flight braking system prevent?

A

Stops the wheel rotating during gear retraction

58
Q

How many brake systems are required on large aircraft?

A

Minimum of 2 independent systems

59
Q

What can the parking brake be supplied from?

A

The brake accumulator

60
Q

What is the main function of the brake metering valve?

A

Regulate break pressure in proportion to brake pedal forces

61
Q

The auto brake system regulates what?

A

A constant brake pressure

62
Q

The anti skid system can only do what?

A

Decrease the brake hydraulic pressure

63
Q

What does the up lock do?

A

Keep the gear retracted

64
Q

How much can the rudder pedals steer the aircraft in degrees?

A

Max of 10 degrees each side

65
Q

How much can the steering wheel steer the aircraft?

A

Up to 80 degrees left or right

66
Q

How to release up lock mechanism?

A

Mechanical pull releases the up lock

67
Q

Extend nose wheel?

A

Extend away from wind

M11 (41 decks)

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