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Cat B- Mod 11 Aircraft Systems > 11.13 Landing Gear > Flashcards

11.13 Landing Gear Flashcards

1
Q

What are the disadvantages of tail wheel?

A

Obscured vision
High drag before tail lift
High risk of nose over

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2
Q

What is a bogie assembly?

A

Multiple wheels on a gear rather than single or double.

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3
Q

What is a structural fuse pin?

A

Pins designed to shear in the event of overload.

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4
Q

What is the torsion link damper used for?

A

Counteract wheel shimmy

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5
Q

What are the main components of a shortening mechanism?

A

Adjustable link
Bellcrank lever
Connecting link
Upper and lower link

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6
Q

What two classes of shock absorber are there?

A

Solid- solid spring made of steel or rubber
Oleo pneumatic- fluid spring with gas or oil

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7
Q

What is hydraulic dieseling?

A

Occurs when air mixes with hydraulic cylinder oil. The air forms bubbles in the hydraulic oil.

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8
Q

What happens when there is too much oil in the oleo?

A

The shock strut operates too harshly

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9
Q

Why are the brakes applied when the gear is moving up or down?

A

To avoid the gyroscopic effect.

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10
Q

How is the life of the landing gears hydraulic components and prevents leakage?

A

The selector valves shut off the pressure supply and open the return lines and the brakes are released.

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11
Q

What are friction bands or pads installed for?

A

To stop the wheels from spinning after retraction

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12
Q

In small aircraft how are the gear extended when air loads alone are not enough?

A

They can be cranked by the pilot

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13
Q

What does a green light represent in terms of gear position?

A

Down and Locked

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14
Q

What does a red light represent in terms of gear position?

A

Unlocked or travelling

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15
Q

What does no lights represent in terms of gear position?

A

Up and locked

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16
Q

When are prox switches used instead of microswitches?

A

When there is a high risk of contact corrosion due to dirt and moisture.

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17
Q

What two types of prox switch are used on aircraft?

A

Reed and electronic switch

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18
Q

What does a reed switch consist of?

A

Two spring loaded normally open contacts

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19
Q

What melting temp does a red fusible plug have?

A

155 degrees c

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20
Q

What melting temp does a green fusible plug have?

A

177 degrees c

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21
Q

What melting temp does a yellow fusible plug have?

A

199 degrees c

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22
Q

What bearings do aircraft wheels have?

A

Tapered roller bearings

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23
Q

What should brake fires be extinguished with?

A

Dry powder

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24
Q

What aircraft use single disc brakes?

A

Light Aircraft

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25
Q

On a dual disc brake what is between the two discs?

A

Centre carrier

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26
Q

What are the main components of multiple disc brakes?

A

Piston housing, torque tube and heat pack

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27
Q

What is the advantage of carbon heat packs over steel?

A

40% lighter and can take 50% higher heats
Last 20-50% longer

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28
Q

What three jobs does a brake piston have?

A

Apply force
Compensate for wear
Auto adjust

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29
Q

What is the piston clearance?

A

Distance between piston and spring sleeve

30
Q

What does 1mm of wear equate too?

A

20-30 landings

31
Q

What does the torque tube do?

A

Transmits the torque of the stator discs to the piston housings

32
Q

What is the key element in a power brake system?

A

Brake metering valve

33
Q

What was the first dunlop maxaret system known as?

A

ABS

34
Q

When is anti-skid inhibited?

A

Below 25 knots

35
Q

What are type I tyres?

A

Used on fix gear with a nominal diameter of 27” found on older aircraft

36
Q

What are type III tyres?

A

Light aircraft with a landing speed of 160 mph.

37
Q

How does the type III tyre number system work?

A

First- Nominal section width
Second- Diameter of rim

38
Q

What is a type VII tyre?

A

Found on jet aircraft

39
Q

What is a type VIII tyre?

A

Used on large aircraft, designated by three numbers.

40
Q

What is a radial type VIII designated by?

A

Letter R

41
Q

What angle is bias ply?

A

30-60 degrees

42
Q

What angle is radial ply?

A

Right angle to rotation

43
Q

What 4 parts of a tyre are there?

A

Bead
Carcass plies
Tread
Sidewall

44
Q

What are the beads?

A

High tensile strength steel wires embedded in the rubber

45
Q

What are the green or white dots on a tyre?

A

Awl markings, seepage vents to allow seeping gas to escape

46
Q

What is the red mark on a tyre?

A

Balance mark

47
Q

What should the red mark line up with?

A

Align with the heavy spot (normally the valve)

48
Q

What is a rib tread good for?

A

Paved surfaces

49
Q

What is a diamond tread good for?

A

Unpaved runways

50
Q

What is an all weather tread?

A

Rib combined with diamond

51
Q

What is a smooth tyre tread good for?

A

Older aircraft without brakes

52
Q

What is a chine tyre?

A

Used on the nose gear of aircraft with fuselage mounted engines.

53
Q

When is rib tread worn?

A

Less than 2mm depth for more than 25% circumference

54
Q

How many times can a tyre be retreaded?

A

10 times

55
Q

When does a dry braking flat occur?

A

When the tyre is locked from rotation while the aircraft is in motion.

56
Q

How does wet braking flat appear?

A

Almost like its been melted.

57
Q

What must happen to a tyre when it is 80% its inflation?

A

Be removed along with any other tyre on its axle

58
Q

When does tread chunking occur?

A

Turning or taxiing quickly

59
Q

What is the general size of chunking allowed?

A

7cm squared

60
Q

What must happen if a tyre has an open tread joint?

A

Tyre must be removed

61
Q

When does lateral scoring take place?

A

When a tyre encounters sideways movement i.e. crosswind landing

62
Q

What is the max size of tread cut allowed?

A

35mm

63
Q

What must happen if a tyre is exposed to a contaminant up to 12 hours?

A

Washed off asap, over 12 hours and it must be sent away.

64
Q

What is the storage pressure of tyres?

A

20-30 psi

65
Q

Aircraft with castor type nose gear steer using what?

A

Differential braking

66
Q

What is surface effect dampening?

A

Used in a non-hydraulic shimmy dampener, rubber piston rubs on the cylinder.

67
Q

What do smaller aircraft use instead of cams to align the nose gear on retraction?

A

Guide pin

68
Q

When the nose gear is steering 70 degrees what can the main gear twist by?

A

5-8 degrees

69
Q

On large aircraft what does the bogie angle used for?

A

WOW sensing

70
Q
A

Cat B- Mod 11 Aircraft Systems (28 decks)

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