Everything Flashcards
3 types of tyre tread
Ribbed
chinned
Anti shimmy
bald
What is bearing creep
Distributes wear evenly to prolong the life of the bearing
What are the type of bearing used in wheels
Tapered roller bearing
Types of tyre and advantages
Tubed and Tubeless
Tubeless has less weight
Cooler running
Less deflation from punctures
less likely for rapid deflation
two types of AC wheels
Divided (two halves)
Loose flange
What are some tyre damages
Wear Flat spots Bulls eye Tyre burst tread bulge ageing
purpose of a valve stem cap
Prevents ingress of dirt and moisture
Acts as secondary seal
What are rotors or stators
Rotors turn with the wheel
Stators are fixed to the wheel hub and are worn away
Actuators pushes rotors and stators together creating friction to slow the aircraft
What is the purpose of landing gear
To support the AC
absorb landing loads
Provide steering on the ground
provides clearance for fuselage, engines, wing stores
Two types of landing gear and where are they are used
Fixed and retractable
Fixed-small AC
Retractable- Faster AC
Landing gear configurations
Tail dragger
Tricycle
Tandem
Multiboogie
How does nose wheel steering control valve assy work
Spring loaded compensator
Why does nose wheel have shimmy damper
Nose wheel shimmy and oscillations
Dampens the movement
What is AC anti skid
how does it work
Prevents skidding from excessive braking
ABS (haul effect)
Prevents pilots from excessive breaking causing skidding
Must have a form of Wheel Speed sensor, detects
if wheel Speed slows and releases
brakes before wheel can skid
- Valve stops all pressure being, relieved for next brake application
ABS is armed in cockpit but runs automatically
Whats an alternative to nose wheel steering
Differntial braking
Differntial throttle
Tug
rudder
What is a fuseable plug
Used to safely deflate tyres due to overheating
Colour coded red, green, yellow to indicate max heat loading
How do shock struts work
2 types
With or without a separator
Piston inside of cylinder with tapered metering pin
When extended fluid flows through metering pin
when compressed fluid is compressed due to metering pin taper, nitrogen acts to extend the piston again
types of retraction
Hydraulic (Linear actuators)
Electrical
Mechanical
Screw jacks
What is used to centre nose wheels for retraction
Cantering Cam
Scissor link
two types of landing gear linkages
Scissor Link- limits oleo extension, aligns wheels
Drag link- holds landing gear extended by over entering, collapses when retracts
Explain components in nose wheel steering
Steering input provides at pilots control wheel
Wheel is connected to cables
Cables move control arm
Control arm move pistons in control valve ASSY
Control valve ASSY allows fluid from steering actuator
Steering actuator moves wheel
Steering collar allows per movement of cables to each side
common damages to bearings
Water stains (indicates intergranular corrosion)
Spalling (chipping or missing material)
Over heating (discolouration)
4 main parts of tyre
Bead
carcass
tread
sidewall
4 landing gear safety devices
Weight on wheels microswitch
Safety pins
Gear indicators
nose wheel centering
Extension of an oleo strut is used to measure
Proper operating position
Can you set the park brake on multiple dick brakes when the brakes are hot?
No. The circulating air is used to cool the brakes
A nose cams primary purpose is to…
Centre the wheel before it enters the wheel
When does Anti skid automatically turn off and what are the 3 main components
Turns off under 20mph
Wheel speed sensor, control box, control valve
Debooster cylinders are used to
Reduce the pressure to the brake,
Increase the volume of fluid flow
How are chevron seals installed
With the open side facing the direction of fluid pressure
What type of valve is used in the brake actuating line to isolate the brake system from the normal power brake control valve
A shuttle valve
Chevron seals are used to
Prevent oil from escaping
