Aircraft landing gear systems Flashcards

1
Q

What is the purpose of a torque link on an oleo strut?

A

To keep the wheel in alignment and prevent the piston from coming out of the cylinder

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2
Q

A landing gear shock strut should be inflated with what gas(es)

A

nitrogen or dry air

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3
Q

What conditions should a mechanic look for during a regular inspection of the exposed piston section of a landing gear?

A

Cleanliness, evidence of damage, and proper extension

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4
Q

What prevents air from leaking out between the two halves of a split wheel assembly?

A

an o-ring

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5
Q

Why are fusible plugs installed on some aircraft wheels?

A

to release the pressure generated by heat build up before a tire blows

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6
Q

What safety precaution must be taken when removing a wheel from an axle or when disassembling a wheel?

A

Verify that the tire is completely deflated before removing a wheel from an axle or before wheel assembly.

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7
Q

What are the visible signs of excessive heating on a wheel bearing?

A

The bearing surfaces show discoloration

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8
Q

How are the pilot’s nose wheel steering commands transmitted to the steering control unit of a large aircraft?

A

Steering signals may be transmitted mechanically, electrically, or hydraulically

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9
Q

How is the nose wheel steering mechanism usually actuated on a small aircraft?

A

By means of a mechanical linkage connected to the rudder pedals.

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10
Q

What is the name of the unit that prevents a nose wheel from vibrating or oscillating?

A

a shimmy damper

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11
Q

What are the most common sources of power used to extend and retract landing gear?

A

Hydraulic pressure and electric motors

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12
Q

At what times should a gear retraction check be performed?

A

During annual or other inspections and following a hard landing.

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13
Q

What mechanism(s) ensure that a nose wheel is not turned as it retracts into its wheel well?

A

Internal centering cams in the strut or an external track

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14
Q

Name several types of brake actuating systems.

A

Independent master cylinders, boosted brakes, and power-controlled brakes.

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15
Q

What is the function of an anti-skid system?

A

Anti-skid systems allow large aircraft to achieve maximum braking effectiveness without allowing wheels to skid or lock.

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16
Q

What is the purpose of a debooster?

A

To reduce hydraulic system high pressure to a lower value for more satisfactory brake action

17
Q

Describe two methods of bleeding brakes?

A

A pressure pot can be attached to the bleeder valve and fluid forced back towards the master cylinder and/or reservoir, or the master cylinder can be used for forcing fluid from the reservoir to the brakes,

18
Q

before a brake system can be inspected for leaks

A

Pressure must be applied to the system

19
Q

What maintenance function has the greatest impact on tire service life?

A

Ensuring that the tires are properly inflated

20
Q

What effet(s) does under-inflation have on aircraft time> and

A

Internal heat damage possible leading to premature tire -failure and more tread wear on the shoulders than the center.