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AGK - Systems > Landing Gear > Flashcards

Landing Gear Flashcards

1
Q

A/c l/d gear layout and config

A

Categorised according to the posn of the subsidiary wheel

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2
Q

Disadv of a taildragger/tailwheel

A

High drag on t/o

Can over brake

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3
Q

Adv of a tricycle undercarriage

A 
Better cockpit vis 
Easier to control on especially in x winds
Less likely to nose over 
Braking is more straight fwd 
Less drag on t/o
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4
Q

Common types of l/d gear

A

Spring steel leg
Cantilever - supported at 1 end only
Rubber cord or bungee
Oleo- pneumatic struts

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5
Q

Torque links

A

Found on oleo-pneumatic l/d gear - stops the main plunger tube rotating inside the leg

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6
Q

% of weight on nose gear

A

10%

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7
Q

% of weight on main gear

A

90%

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8
Q

Definition of bogies

A

4 or more wheels on a bogey beam

Could also be called truck or set

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9
Q

Typical main wheel arrangements

A

Single
Tandem
Double
Bogie

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10
Q

Main disadvantage of a bogie

A

Large footprint of a bogie unit will cause the unit to crab whilst turning

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11
Q

Main types of wheel attachment

A

Cantilever - for light a/c

Forked, Half forked - stronger, for heavier a/c

Dual - load spread over 2 wheels

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12
Q

% of shock absorbed by shock absorbers

A

90%

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13
Q

Oleo pneumatic the use of nitrogen gas

A

In the main plunger - acts as a spring to absorb the loads

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14
Q

Oleo pneumatic- oil

A

In the main body to dampen the spring action

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15
Q

Oleo pneumatic - most likely cause for the fescalised portion being too small is

A

The shiny bit

Low gas n2 pressure

Could result in bottoming-out on l/d

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16
Q

Oleo pneumatic - oil

A

If oil levels are too low the rebound is not properly damped

17
Q

Purpose of the shortening mechanism

A

Shortens/lengthens the gear on retraction/extension

18
Q

Brake bars

A

Torque limiting - torque links sends a message to the braking system about heavy braking - prevents wheel leg bending

19
Q

An example of an additional load on the l/d gear

A

Towing = shear

20
Q

Creep - l/d gear

A

Unwanted movement of the screw jack - req a mechanical lock to prevent this on screwjack l/d gear

21
Q

Automatic self centring

A

Ensures the nose wheel is centred before it is retracted - needs to be for extension/retraction

22
Q

Castering

A

Allow stejering by differential braking

23
Q

Downlocks on l/d gear

A

Ensures that accidental retraction can’t occur

24
Q

Over centred geometric device

A

Used to lock gear down

25
Q

Retraction and extension is completed by

A

Selector valves

26
Q

The edge of the l/d gear door is

A

Frangible

27
Q

Solenoid latch

A

Prevents YOU from moving the gear lever while on the ground

Info is sent through from the air/ground logic circuits - weight on wheels

28
Q

OFF posn on the l/d gear lever

A

Stops the pressuring of the gear system during flight

29
Q

When does the l/d gear warning horn activate

A

A/c is in the l/d config and 1 or more throttle levers are less than approximately 1/3rd open

Continuous horn for l/d

Interment horn for t/o

30
Q

VLE and VLO

A

VLE = max speed with the l/d extended

VLO = max operating speed for the l/d gear - doors become the limiting factor

31
Q

The tiller can steer the nose wheel

A

75* left or right

May be supplemented by body gear steering which reduces the tyre damage caused by scrubbing

32
Q

Shimmy definition

A

Rapid sinusoidal oscillation of the nosewheel and is divergent in nature

33
Q

Possible causes of shimmy

A 
Uneven tyre pressure 
Unevenly worn tyres 
Unbalanced wheels 
Worn shimmy damper or wheel bearings 
Worn torque link will make things worst
34
Q

How to reduce shimmy

A

Hydraulic damper fitted
Heavy self centring springs
Double nose wheels
Twin contact tyres - maarstrand twin contact tyre

AGK - Systems (16 decks)

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