wheels

Question 1

what do the wheels and tyres support

Answer 1

support on ground
mobility for taxiing, take off, landing

Question 2

Tyers’ purpose is?

Answer 2

absorb/ cushion aircraft from the shok of irregular surface and landing techniques

Question 3

Nose wheel houses what?

Answer 3

brake unit

to provide means of deaccleration when landing

Question 4

Aircraft wheels facilitate…

Answer 4

tyre replacement

Question 5

Types of wheels

Answer 5

Loose & Detachable wheels

Divided wheels

Question 6

Loose & detachable wheels

Answer 6

made with
1) one flange that is integral with the wheel body
2) one loose flange that is fitted over the rim

Question 7

difference between loose and detachabel flange wheels

Answer 7

is how they are secured

Loose flange = retained by locking device on the rim

detacheable = secured by nuts & bolts

*detacheable flange might be one piece or multiple pieces

Question 8

Divided wheel

Answer 8

two half wheels connect by nuts/washers, bolts, and/or tapped,

also a seal is incorporate to avoid abrassion between two half and provide airtight joint

Used with ‘Tubeless typre”

Question 9

how to prevent creep

Answer 9

When typres rotate and ‘slippage’ around the wheels occurs

Excess creep tears out the inflation valve and tyre will burst

to avoid:
1. ensure air pressure in tyre is correctly maintained
2. Incorporate good wheel design

Question 10

how to conteract/monitor creep

Answer 10

Knurled Flange
The inner side of the flange is milled, so that the side pressure of typre locks the beads to the flange

Tapered Bead Seat
The wheel is tapered so that the flange area is is of greater diameter than the centre of the rim.
When tyre is inflated, the side pressure forces beads outwards to grip the rim

Creap Marks
painted white lines can be spoted when misaligned

Question 11

wheel material

Answer 11

alumium alloy
magnesium alloy - electrom

Question 12

after initial machining, what treatments are applied to the wheels

Answer 12

anti-corrosive treatments:

1) alumiumum alloy == anodizing
2) magnesium == chromate
3) final finish iwth cellulose or epoxy resin applied to the wheels

Question 13

wheels for tubeless tyres

Answer 13

similar construction to non-tubeless tyres

are i**mpregnated with Bakelite to seal **the material

uses O ring seals to prevent leakage

Valve is built into the wheel itself - not effected by creep (but creep can affect typres still)

Question 14

Fusible plugs

Answer 14

hard braking can cause exceel heat and tyre blow out…

to prevent it, fusible plugs are fitted in ‘Tubeless tyres’ to allow controlled deflation

3 Temperatures coded for identification:

Red: 155C
Green 177C
Amber: 199 C

Question 15

Creep is normal on new typres

Answer 15

yes..