Landing Gear, Tyres and Brakes Flashcards
What system refers to a nosewheel not connected to rudder pedals and free to move on its own?
Free-castering
Free-castering refers to what?
Nosewheel not connected to rudder pedals
When does nosewheel shimmy occur?
Vibration during ground-roll
Main cause of nosewheel shimmy?
Failure of the torque link (shimmy damper)
For hydraulic fluid, what type of viscosity is preferred?
High viscosity
What component often connects a nosewheel with the fuselage?
Oleo-pneumatic unit
An oleo-pneumatic unit is of what kind of construction?
Telescopic
In an oleo-pneumatic unit, what is compressed?
Air
Special oil is used as what in an oleo-pneumatic unit?
Damping agent
What is used as a damping agent in an oleo-pneumatic unit?
Oil
What component ensures nosewheel alignment with the airframe?
Torque-link
What function does a torque-link perform?
Aligns nosewheel with the airframe
How does a torque-link allow the oleo-pneumatic unit to move?
It is hinged
What term is used for wheels that are uncontrolled by the pilot?
Castor
Symptoms of too-high tyre pressures?
Vibration during taxiing
Uneven wear
Burst tyres
What exhibits these symptoms?
Vibration during taxiing
Uneven wear
Burst tyres
Too high tyre pressure
What are the symptoms of tyres with too-low pressure?
Damage to tyre structure
Tyre creep with respect to the rim
What exhibits these symptoms?
Too-low tyre pressure
What do marks on tyres and rims help monitor?
Tyre creep
What occurs when tyres drag in rotation with respect to their metal rim?
Tyre creep
What is the measurement of a tyre’s supposed strength?
Ply rating
Ply rating is the measurement of what?
Tyre strength
What does the rubber tread provide in a tyre?
A wearing surface between the tyre and runway
What provides a wearing surface between tyre and runway?
Rubber tread
A hydraulic system requires what kind of fluid?
Incompressible
Hydraulic systems rely on what theoretical law?
Pascal’s Law
What does Pascal’s Law necessitate?
A change in pressure at any point must be transmitted so that the pressure change occurs equally everywhere
What does a selector valve do in a hydraulic system?
Controls direction of flow
In a hydraulic system, what controls the direction of flow?
Selector valve
In a hydraulic system, what relieves excess pressure?
Relief valve
In a hydraulic system, what does a relief valve do?
Relieves excess pressure
What term is given to a servo that can have fluid applied to both sides?
Double-acting
In a hydraulic system, what component turns fluid power into work?
Servo
Mineral-based hydraulic fluids are dyed what colour?
Red
What can occur with hydraulic mineral-based fluids that don’t have hoses or seals?
Corrosion
What kind of hydraulic fluids are used for high landing speeds?
Phosphate esters
Phosphate esters are dyed what colour?
Purple
Why are phosphate esters used for aircraft with high landing speeds?
They have good fire-resistant properties
What are fitted to main wheels for braking?
Disc brakes
A typical braking system contains hydraulic fluid where?
Master cylinder
What does a master cylinder do in a typical braking system?
Contains hydraulic fluid
In a typical braking system, what closes the brake friction pads onto the brake disc?
Slave cylinder
Applying toe brake in a braking system performs what operation?
Pressure is transmitted from the master cylinder to a slave cylinder
In a braking system, what does the slave cylinder close when operated?
Brake pads
What fire extinguisher should be used in the event of a tyre fire?
Dry Powder
