The Landing Gear Flashcards

1
Q

Advantages of a tricycle gear

A

Better directional stability (CG further forward)
Less likely to nose over
Less drag improves takeoff performance.

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2
Q

Most common types of fixed landing gear

A

Spring Steel Leg / Cantilever

Rubber cord or bungee

Oleo Pneumatic Struts

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3
Q

Purpose of torque/torsion link

A

Stops plunger/sliding tube from rotating inside leg/body

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4
Q

Bogie Definition

A

Have at least for wheels per landing gear leg

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5
Q

Main disadvantage of bogie

A

When turning, crabbing will occur due to large footprint.

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6
Q

What acts as a damper (whole system)

A

The oil and nitrogen

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7
Q

What acts as a spring?

A

The gas acts as a spring to absorb the loads.

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8
Q

What acts as a damper?

A

The oil acts to dampen the spring action

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9
Q

Most likely cause of the fescalised portion of the leg being too small is:

A

Insufficient N2 pressure

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10
Q

Consequence of insufficient nitrogen gas in oleo strut?

A

Bottoming-out on landing

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11
Q

Ramifications of insufficient oil

A

Gear rebound is not properly damped

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12
Q

Purpose of mechanical lock?

A

Prevents creep.

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13
Q

Break Bars

A

Torque limiting devices that limits force through brakes, then through the wheels.

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14
Q

Nose Wheel Requirements

A

Free Castoring, to allow differential braking

Automatic self centering to ensure nosewheel is centered prior to retraction.

Shimmy Protection

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15
Q

Which additional load may nosewheel steering cause on the landing gear?

A

Towing - Shear

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16
Q

Define Castoring

A

The ability of the nosewheel to move either side of the neutral position.

17
Q

Ground Locks

A

Must be removed before flight.

18
Q

What prevents the inadvertent retraction of the landing gear on the ground?

A

A solenoid operated LATCH pin

19
Q

Emergency Gear Extension

A

Via Gravity, however doors will be too big to close. Therefore the protruding material is frangible, and will be replaced.

20
Q

Amber Lights - Indication

A

Amber lights are for DOOR INDICATION.

21
Q

Scenario - no landing gear main lights, however 1 is amber. What is a possible scenario?

A

Undercarriage is up and locked. Landing gear doors are party open/not fully closed.

22
Q

Continuous L/G Horn

A

Will sound if in landing configuration, throttles are set to less than 33%, will continue until L/G is down and locked.

23
Q

Red Landing Gear Indication

A

Gear is unlocked

24
Q

VLE

A

Maximum Speed with Landing Gear Extended

25
Q

VLO

A

Maximum Landing Gear Operating Speed - Undercarriage doors limiting factor, slowest of the landing gear speeds.

26
Q

What does a tiller operate?

A

Small electric / hydraulic motor connected to nosewheel strut.

27
Q

Nosewheel Shimmy

A

Rapid, sinusoidal oscillation of the nosewheel, divergent in nature.

28
Q

Caushes of Shimmy

A

Uneven tyre pressures

Uneven worn tyres

Unbalanced wheels

Worn shimmy damper

Worn torque link

29
Q

Reduction of shimmy

A

Hydraulic jack across steering jack piston

Hydraulic damper

Double nosewheels

30
Q

Maarstrand Tyres

A

Twin contact tyres

31
Q

What is the purpose of a loose/detachable flange

A

Designed to facilitate tyre replacement

32
Q

Define Tyre Creep

A

Tendency of the tyre to rotate around the circumference of the wheel.

33
Q

Purpose of Fusible Plugs

A

Prevent the tyre against explosion due to excessive temperature.

34
Q

How many Fusible Plugs are there, and where are they fitted?

A

One or more, on inner half of the wheel