Lesson 12: WHEELS & TIRES Flashcards
What are aircraft wheels made of?
Forged Al
Magnesium alloy
Due to high surface tensile loads, what is the most critical part of the wheel?
BEAD SEAT AREA
What are 2 types of wheel design?
Split Hub
Flange type
This component will deflate the tire in the even of extreme OVERHEAT
Fusible plug
This type of wheel is essentially a single piece hub with a removable flange acting like an outboard
FLANGE type
During wheel maintenance what is the key factor?
Deflate the tire PRIOR to loosening axle nut
Why should you never remove two wheels from the same axle at the same time?
In case the jack collapses
Tube and tubeless are types of what?
Tires
What are the primary parts of a tire?
BEAD
CARCASS
TREAD
SIDEWALL
What is the most important part of the tire and why?
BEAD,
- anchors the carcass and provides firm mounting surface for tire on wheel
- all forces terminate at the bead
Bias and radial are types of what?
CARCASS
This component of the tire gives it the required traction and is the outer surface
TREAD
What are 4 types of tread?
plain
all weather
rib
chine
This part of the tire is a rubber cover extending from the tread down to protect from cuts, bruises, moisture and ozone
SIDEWALL
What is the purpose of the sidewall?
Protect the carcass plies
When inspecting tires, what are we looking for?
Inflation
Tread/sidewall condition
When should tire pressure be checked?
tire is cold, 2-3hrs after flight arrival
How should tires be inflated?
SLOWLY
LOW pressure nitrogen
If the pressure differential should rise above a predetermined value on 2 tires at the same axle, what do you do?
Both replaced
If a tire is over inflated, how would you know?
Centre tread wear
If it under inflated, how would you know?
`Shoulder tread wear
If the tread has a worn flush, or a carcass ply is exposed what does this tell you?
Unservieable
When do you place a tire in an inflation cage?
initially installed on wheel
What is the general rule for replacing a tire with a cut?
exceeds 1/2 rib width
carcass ply exposed
Rough runways could cause ?
CHUNKING
How would tread separation occur?
excessive loads
heating from underinflation
Cross grooved runways can cause what?
CHEVRON CUTTING
This component deflects water away from tail mounted engines
CHINE
2 types of tube construction?
Reinforced rubber
reinforced nylon fiber
What are the 2 primary causes of aircraft tube leak?
tube hole
defective valve
The yellow mark on a tube represents what?
Heavy point
