Aircraft Tires Flashcards
fitted with pneumatic tires
aircraft wheels
Aircraft wheels are fitted with pneumatic tires which may be ______ or have an _______.
tubeless, inner tube
These tires are used on some light aircraft and on older aircraft.
tires fitted with inner tubes
Most modern aircraft have this tire fitted.
tubeless tires
What are tires usually inflated with?
nitrogen
What enables the tires to absorb shocks and supports the weight of the aircraft?
nitrogen
What enables the tires to maintain its shape, transmit braking, and provide a wearing surface?
tire cover
If a tube is fitted, the tire also _______ the tube and protects it from damage.
restrains
Where is tread of the tire situated?
crown and shoulder
This allows the tire to be flexible.
sidewall
This is seated inside the flange of the wheel.
bead
Sections or Regions of a Tire
crown, shoulder, sidewall, bead
Two Common Types of Tire
radial ply, bias or cross ply
The tire consists of a casing made of plies of _______, _____, or ______ cords.
cotton, rayon, nylon
The cords in a tire are not woven but __________ in single layers and held together by a ___________ which prevents cords of adjacent plies from cutting one another as the tire flexes in use.
arranged parallel, thin film of rubber
During construction of the tire, the plies are fitted in pairs and set out so that the cords of adjacent plies are at ____ degrees to one another in the case of ____________ tires.
90, bias or cross ply
The plies are fitted bead to bead at approximately 90 degrees to the centerline of the tire in _______ tires.
radial ply
The tire manufacturer gives each tire a _____.
ply rating
A ply rating does not relate directly to the number of plies in the tire but is the ___________ of the tire.
index of the strength
Where is the ply rating shown in a tire?
sidewall
This holds the tire on its wheel.
beads
The beads are made of ________.
high tensile wire strands
Each wire strand is coated with _______ compound and is ________ into a coil of the specified diameter for the tire.
rubber, spiral-wounded
The _____ are wrapped around the beads and turned out back on to themselves.
plies
two narrow plies embedded in thick layers of rubber between the casing and the tread
breaker strips
absorbs and distributes load shocks and protects the casing from concussion damage
breaker strips
Breaker strips are two narrow plies embedded in thick layers of rubber between the _____ and the _____.
casing, tread
What is the most popular tread pattern?
ribbed type
formed from circumferential grooves around the tire to assist in water dispersion and to help prevent aquaplanning or hydroplanning
ribbed type
help to improve contact grip between the tread and runway surface
grooves
molded onto the shoulder of nosewheel tires particularly fitted to aircraft with the engines mounted on the rear fuselage
chine or chines
rubber extensions designed to direct water away from the engine intakes and so prevent flameouts due to water ingestion
chine or chines
A nosewheel tire fitted to a _______ installation will have a chine molded onto both sides of the tire.
single wheel
A nosewheel tire fitted to a ________ installation will have a chine only on the outer edge of each tire.
double wheel
It is required whether the tire is fitted with a tube or is tubeless.
inflation valve
In the case of the tire with a tube, the _________ is part of the tube installation.
valve form
On a tubeless tire, inflation valve is fitted directly onto the wheel rim with a ___________.
rubber sealing gasket
Each inflation valve is fitted with a ___________.
non-return valve
The ________ is considered to be a perfect seal, therefore, the inflation valve must always be fitted with the _________.
valve core, valve cap
prevents dirt from entering the valve
valve cap
It is important when doing the external check of the aircraft that the valve caps are checked, which are normally colored ________, are fitted.
yellow
Valve caps will slow down the loss of pressure in the event of a _________.
valve failure
Four Main Groups of Tire Inflation
- low
- medium
- high
- extra high-pressure
These tires are designed to operate at a pressure of 25 to 35 psi.
low pressure tires
These tires are fitted to aircraft using grass surfaces for takeoff and landing.
low pressure tires
These tires operate at a pressure of 35 to 70 psi.
medium pressure tires
These tires are used on grass surfaces or on medium firm surfaces without a consolidated base.
medium pressure tires
These tires operate at a pressure of 70 to 90 psi.
high pressure tires
These tires are suitable for concrete runways.
high pressure tires and extra high-pressure tires
These tires are fitted to most large modern airliners.
extra high-pressure tires
These tires operate at pressures of over 90 psi with some being inflated to 350 psi.
extra high-pressure tires
Tires in use must be kept inflated to the correct pressure using nitrogen or other inert gas with _______ oxygen content.
less than 5%
_________ may move or creep around the wheel.
underinflated tires
________ will cause other types of failure such as loss of control due to reduced traction and contact with the road surface.
overinflated tires
It is estimated that _____ of all tire failures can be attributed to incorrect gas pressure.
90%
Overinflation will cause excessive wear to the ______ of the tires whilst underinflation is the cause of excessive _______ and ______.
crown, shoulder wear, creep
On some modern aircraft, real-time tire pressures can be displayed on the flight deck like on an A320 _______.
Electronic Centralized Aircraft Monitor (ECAM)
The manufacturer will set a ____________ to which a tire can be subjected.
maximum ground speed
A maximum ground speed set by the manufacturer of a tire will be marked on the _____ of the tire.
side
Why is it important that the maximum ground speed on a tire is not exceeded?
possible tread separation may occur
