11.13 Flashcards
What aircraft uses tail wheel configuration
Propeller and light
In a tail wheel configuration where is the main gear located in terms of CoG
Foward of the aircraft centre of gravity
What’s the most used landing gear arrangement and where is the Cog
Tricycle configuration
CoG is ahead of main wheels
What’s are 3 advantages of tricycle configuration
Ground looping prevented
Better braking
Forward vision not obstructed
What is thr configuration of the landing gear in tandem
Main and tail along longitudinal axis
Gear is fwd and aft of CoG
What aircatft uses fixed landing gears
Low speed aircraft to save weight and money
What’s the function of the truncation link
Connect top of the leg to wing structure
Leg can rotate into out and of landing gear bay
What are the cylinders filled with
Hydraulic oil and nitrogen
What makes sure that 2 parts of landing gear can’t fold together when the main gear is extended
Gear down lock mechanism
What does the shortening mechanism work in opposite to
Landing gear extension
Where is the nose landing gear retracted to
Fwd into fuselage
How many wheels does the nlg have and is it steerable
2 wheels and steerable with no brakes
(Lighter then Main Landing Gear)
How does the ngl extend without hydraulics
Weight of the gear and air stream
What does the axle do
Proved instillation of the aircraft wheels
What does the axle do
Proved instillation of the aircraft wheels
What does a torque link dampener do
Named shimmy damper
Counteracts wheel shimmy
What are the two types of shock absorbers
Solid - made of steel or rubber
Oleo pneumatic - fluid spring with gas or oil
What are the two parts of oleo pneumatic strut
One compresses oil at pressure above 700 bar
One uses oil and nitrogen
What are main gear shock struts serviced with
Nitrogen gas and specified hydraulic fluid
Why do we need correct sequencing with the landing gear
Prevents it from getting jammed
How is the inner cylinder in the nose shock strut during take off
Inner cylinder in the nose fully extendeds
On nose gear extension what makes sure that the jack moves under positive pressure
Restricted return flow
What emergency extension system is preferred
Free fall system
What does a green light indicate
Down and locked
What colour indicates the landing gears is unlocked or travelling
Red
If no lights are showing what does that mean for the gear
Up and locked
What are micro switches and used when
Devices that can open and close an electrical circuit at very high speed
Used when physical contact with an object is permissible
When are proximity switches used
When high risk of contact corrosion can occur from dirt and moisture
2 types of proximity switches
Reed and Electrical
How does a reed switch protect against corrosion
Contacts are in a glass tube
What material is a electronic proximity switch
Non magnetic ferrous metal to influence electrical characteristics
How can the crew visually see if landing gear is down and locked
Small viewing assembles in the floor of aircraft
Correct positioning is indicated by red paint stripes and arrows aligned
When can the auditory warning not be cancelled unless the landing gear is selected down
If the landing flap is selected with the gear not down
What are aircraft wheels made of
Forged or cast from aluminium alloy
How and when are wheels balanced
Statically and dynamically at manufacture
How and when are wheels balanced
Statically and dynamically at manufacture
Where are brakes fitted
Inboard half of the wheel
What’s the job of a fusible plug
Release tyre pressure when the temperature of a wheel hits a certain temperature
What aircraft use single disk brakes
Small aircraft
How many brake linings in a single disk brake
6
How does the caliper housing remove unwanted air
Bleed port
Why would you multiple disk brakes
Increased friction surface to maximise braking forces and heat to disperse
Rotor and stator material
Carbon fibre
40% lighter than conventional brakes
Advantage for carbon heat packs
Withstand temperatures over 50% higher than steel brakes
Last 20-50% longer
Brake piston function
Apply brake force relative to pressure applied to brakes
Compensate for the wear of disc brakes
Automatically adjust brake clearance
What is piston clearance
Distance between piston and spring sleeve
What shows us the wear of the heat pack
Wear indicator pin
How many wear indicators attached to pressure plate
2
Where is brake booster located
Downstream of the control valve and anti skid
How does parking brake work
Shut off valve is closed in the common return line
Traps fluid in the brakes which keeps rotors stationary
What colour are numbers 0-4
White
What colour are numbers 5-9
Amber
What does brake debooster do
Reduces the maximum hydraulic system pressure
Type 3 tyres
Type 7 tyres
High performance on jet aircraft
Type 8 tyres
High pressure and high speed aircraft
Most advanced
Fabric layer in tyre
Carcass
Fabric is orientated to what
90 degrees to Plane of rotation
What does a balance mark show
Light point in tyres balance
What Touchdown protection
Anti skid valve opens passage between brakes and hydraulic system
Stops build up in brakes
What are tyres inflated to for storage
20-30psi
