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Airframe Writtens > Aircraft Landing Gear Systems > Flashcards

Aircraft Landing Gear Systems Flashcards

1
Q

Exposure to and/or storage near which of the following is considered harmful to aircraft tires?

A

Fuel, oil, ozone, electrical equipment, hydraulic fluid, and solvents.

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2
Q

What would be the effect if the piston return spring broke in a brake master cylinder?

A

the brakes would drag.

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3
Q

In brake service work, the term “bleeding brakes” is the process of what?

A

withdrawing fluid from the system for the purpose of removing air that has entered the system.

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4
Q

To prevent a very rapid extension of an oleo shock strut after initial compression resulting from landing impact,…

A

various types of valves or orifices are used used which restrict the reverse fluid flow.

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5
Q

A pilot reports the right brake on an aircraft is spongy when the brake pedal is depressed in a normal manner. The probable cause is what?

A

air in the brake hydraulic system.

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6
Q

Aside from an external leak in the line, what will cause parking brakes to continually bleed off pressure?

A

An internal leak in the master cylinder.

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7
Q

Why do most aircraft tire manufacturers recommend that the tubes in newly installed tires be first inflated, fully deflated, and then reinflated to the correct pressure?

A

To allow the tube to position itself correctly inside the tire.

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8
Q

The metering pins in oleo shock struts serve to what?

A

retard the flow of oil as the struts are compressed.

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9
Q

What action should be taken whenever maintenance is performed that will affect the landing gear system performance?

A

the aircraft should be placed on jacks and a retraction test should be performed.

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10
Q

When working with high pressure, high performance tires, why is it recommended to deflate the tires when removing wheels from the axle?

A

to ensure safety in case of defective wheel or broken tie bolts.

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11
Q

The braking action of a Cleveland disk brake is accomplished by compressing a rotating brake disk between two opposite brake linings. How is equal pressure on both sides of the rotating disk assured?

A

By allowing the caliper to float to automatically equalize as pressure is applied to the rotor.

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12
Q

If it is determined that spongy brake action is not caused by air in the brake system, what is the next most likely cause?

A

Deteriorated flexible hoses.

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13
Q

Many brake types can be adapted to operate mechanically or hydraulically. Which type is not adaptable to mechanical operation?

A

Expander-tube type.

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14
Q

A brake debooster valve is installed in systems where the high pressure of the hydraulic system (3,000 psi) is used to operate brakes…

A

that are designed to work with lower pressure.

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15
Q

A stripe or mark applied to a wheel rim and extending onto the sidewall of a tube-type tire is a what?

A

slippage mark.

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16
Q

When bleeding aircraft brakes, one of the indications that the air has been purged from the system is what?

A

firm brake pedals.

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17
Q

Overinflated aircraft tires may cause damage to the what?

A

Wheel flange,

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18
Q

Debooster valves are used in brake systems primarily to what?

A

reduce the pressure and release the brakes rapidly.

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19
Q

The repair for an out-of-tolerance toe-in condition of main landing gear wheels determined not to be the result of bent or twisted components consists of what?

A

inserting, removing, or changing the location of washers or spacers at the center pivotal point of the scissor torque links.

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20
Q

On an air valve core stem, what indicates high-pressure type?

A

An embossed letter “H.”

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21
Q

The primary purpose for balancing aircraft wheel assemblies is to what?

A

prevent heavy spots and reduce vibration.

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22
Q

Power boost brake systems are used on aircraft that have what?

A

high landing speeds.

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23
Q

On all aircraft equipped with retractable landing gear, some means must be provided to what?

A

extend the landing gear if the normal operating mechanism fails.

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24
Q

An automatic damping action occurs at the steering damper if for any reason the flow of high-pressure fluid is removed from the what?

A

inlet of the steering damper.

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25
Q

What is the purpose of the torque links attached to the cylinder and piston of a landing gear oleo strut?

A

Maintain correct wheel alignment.

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26
Q

The removal, installation, and repair of landing gear tires by the holder of a private pilot certificate on an aircraft owned or operated is considered to be what?

A

preventive maintenance.

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27
Q

Aircraft brakes requiring a large volume of fluid to operate the brakes generally…

A

use power brake control valves.

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28
Q

What is one effect a restricted compensator port of a master cylinder will have on a brake system?

A

the restriction will cause slow release of the brakes.

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29
Q

When an air-oil type of landing gear shock strut is used, the initial shock of landing is cushioned by what?

A

the fluid being forced through a metered opening.

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30
Q

Internal leakage in a brake master cylinder unit can cause what?

A

the pedal to slowly creep down while pedal pressure is applied.

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31
Q

A sleeve, spacer, or bumper ring is incorporated in a landing gear oleo shock strut to what?

A

limit the extension stroke.

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32
Q

The purpose of a sequence valve in a hydraulic retractable landing gear system is to what?

A

ensure operation of the landing gear and gear doors in the proper order.

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33
Q

The pressure source for power brakes is what?

A

the main hydraulic system.

34
Q

Which statement is true with respect to an aircraft equipped with hydraulically operated multiple-disk type brake assemblies?

A

Do not set parking brake when brakes are hot.

35
Q

What type of valve is used in the brake actuating line to isolate the emergency brake system from the normal power brake control valve system?

A

A shuttle valve.

36
Q

When servicing an air/oil shock strut with MIL-5606 the strut should be what?

A

collapsed and fluid added at the filler opening.

37
Q

Instructions concerning the type of fluid and amount of air pressure to be put in a shock strut are found…

A

in the aircraft manufacturer’s service manual.

38
Q

The purpose of a relief valve in a brake system is to what?

A

compensate for thermal expansion.

39
Q

Aircraft tire pressure should be checked…

A

at least once a week or more often.

40
Q

If the extended longitudinal axis of the main landing gear wheel assemblies intersects aft of the aircraft, the wheel can be termed as having what?

A

toe-out.

41
Q

What is the purpose of a compensating port or valve in a brake master cylinder of an independent brake system?

A

permits the fluid to flow toward or away from the reservoir as temperature changes.

42
Q

If an aircraft shock strut (air/oil) bottoms upon initial landing contact, but functions correctly during taxi, the most probable cause is what?

A

low fluid.

43
Q

What is the function of a cam incorporated in a nose gear shock strut?

A

Straightens the nosewheel.

44
Q

Extension of an oleo shock strut is measured to determine the what?

A

proper operating position of the strut.

45
Q

Debooster cylinders are used in brake systems primarily to what?

A

reduce the pressure to the brake and increase the volume of fluid flow.

46
Q

If a shock strut bottoms after it has been properly serviced, the what?

A

strut should be removed, disassembled, and inspected.

47
Q

A high-speed aircraft tire with a sound cord body and bead may be recapped…

A

an indefinite number of times.

48
Q

If an airplane equipped with master cylinders and single-disk brakes has excessive brake pedal travel, but the brakes are hard and effective, the probable cause is what?

A

worn brake linings.

49
Q

The correct inflation pressure for an aircraft tire can be obtained from what?

A

the aircraft service manual.

50
Q

What should be checked when a shock strut bottoms during a landing?

A

Fluid level.

51
Q

How is it determined in a master cylinder brake system that all of the air has been purged from the system?

A

By depressing the brake and noting that the brake is firm and not spongy.

52
Q

The left brake is dragging excessively on an airplane on which no recent brake service work has been performed. The most probable cause is what?

A

foreign particles stuck in the master cylinder compensating port.

53
Q

If a brake debooster is used in a hydraulic system, its position in the system will be what?

A

between the brake control valve and the brake actuating cylinder.

54
Q

The hydraulic packing seals used in a landing gear shock strut are what?

A

used only with a specific type of fluid.

55
Q

Lockout deboosters are primarily pressure reducing valves that what?

A

allow full debooster piston travel without fluid from the high pressure side entering the low pressure chamber.

56
Q

A close inspection of a fusible plug reveals the core has experienced some deformation. What is the appropriate maintenance procedure?

A

Replace all the fusible plugs.

57
Q

Chines are used on some aircraft nose wheel tires to help what?

A

deflect water away from the fuselage.

58
Q

The best safeguards against heat buildup in aircraft tires are what?

A

short ground rolls, slow taxi speeds, minimum braking, and proper tire inflation.

59
Q

The fusible plugs installed in some aircraft wheels will what?

A

melt at a specified elevated temperature.

60
Q

What action, if any, should be taken when there is a difference of more than 5 pounds of air pressure in tires mounted as duals?

A

Correct the discrepancy and enter in the aircraft records.

61
Q

How long should you wait after a flight before checking tire pressure?

A

At least 2 hours (3 hours in hot weather).

62
Q

What is the minimum amount of time to wait for tires to cool before checking tire pressure?

A

3 hours

63
Q

Excessive wear in the shoulder area of an aircraft tire is an indication of what?

A

underinflation.

64
Q

Excessive wear in the center of the tread of an aircraft tire is an indication of what?

A

overinflation.

65
Q

When servicing an empty shock strut with fluid, the strut should be completely compressed and extended several times to ensure what?

A

proper packing ring seating and removal of air bubbles.

66
Q

In shock struts, chevron seals are used to what?

A

prevent oil from escaping.

67
Q

On most aircraft, the oil level of an air and oil shock strut is checked by what?

A

releasing the air and seeing that the oil is to the level of the filler plug.

68
Q

A pilot reports that the brake pedals have excessive travel. A probable cause is what?

A

lack of fluid in the brake system.

69
Q

When will a continuous horn provide a warning in the cockpit?

A

When the throttle is retarded and gear is not down and locked.

70
Q

An electric motor used to raise and lower a landing gear would most likely be a what?

A

split field series-wound.

71
Q

When installing a chevron-type seal in an aircraft hydraulic cylinder, the open side of the seal should face what?

A

the direction of fluid pressure.

72
Q

Nose gear centering cams are used in many retractable landing gear systems. The primary purpose of the centering device is to what?

A

center the nosewheel before it enters the wheel well.

73
Q

What device in a hydraulic system with a constant delivery pump allows circulation of the fluid when no demands are on the system?

A

Pressure regulator.

74
Q

A fully charged hydraulic accumulator provides what?

A

a source for additional hydraulic power when heavy demands are placed on the system.

75
Q

A hydraulic system referred to as a “power pack” system will what?

A

have all hydraulic power components located in one unit.

76
Q

A flexible hydraulic hose identified as MIL-H-8788 will have a strip running the length of the hose. This stripe is what?

A

installed without excessive twisting.

77
Q

An O-ring intended for use in a hydraulic system using MIL-H-5606 (mineral base) fluid will be marked with what?

A

a blue stripe or dot.

78
Q

What condition would most likely cause excessive fluctuation of the pressure gauge when the hydraulic pump is operating?

A

Inadequate supply of fluid.

79
Q

A filter incorporating specially treated cellulose paper is identified as a what?

A

Micronic filter.

80
Q

The purpose of an orifice check valve is to what?

A

restrict flow in one direction and allow free flow in the other.

81
Q

(Refer to figure 10.) The trunnion nut on an aircraft landing gear requires a torque of 320 inch-pounds. To reach the nut, a 2-inch straight adapter must be used on an 18-inch torque wrench. How many foot-pounds will be indicated on the torque wrench when the required torque of the nut is reached?

A

24.

82
Q

A special bolt in a landing gear attachment requires a torque value of 440 inch-pounds. How many foot-pounds are required?

A

36.6

Airframe Writtens (34 decks)

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