Chapter 3 - Undercarriage

Question 1

What are the undercarriage components of a skid type?

Answer 1

Skid tube 
Skid shoes 
Skid post 
Cross tubes 
Attachment fittings 
Pivot

Question 2

What is the basic maintenance for an undercarriage?

Answer 2

Examination 
Surface finish restoration 
Wear check 
Lubrication 
Track check

Question 3

What are the undercarriage components for a wheeled type?

Answer 3

Support tubes 
Oleos (shock absorbers) 
Axle 
Wheels 
Brake unit

Question 4

What makes a brake unit?

Answer 4

Rotor disc and the brake pad calliper Unit

Question 5

What components are there in a oleo pneumatic shock absorber?

Answer 5

Piston rod
Cylinder 
Piston ram with holes 
Floating piston 
Air chamber 
fluid reservoir

Question 6

What components does an aircraft wheel have?

Answer 6

Bearings
Hub (bearings are kept in here)
Inner tubes (mainly on old aircraft)
Tyres

Question 7

What are the properties on the tyre?

Answer 7

Tread groove 
Linings
Tread
Sidewall 
Shoulder
Beads 
Inner liner

Question 8

What are the main faults with tyres?

Answer 8

Wet braking 
Shoulder wear 
Bulging 
Severe cuts 
Dry braking flat 
Chunking

Question 9

What are the components of the nose undercarriage?

Answer 9

Caster lock
Caster lock release handle
Torque link

Question 10

What are the steps for initial tyre inflation?

Answer 10

1. Remove valve core, place wheel in safety cage, fit air supply to valve stem and Lock cage.
2. Inflate tyre until bead sits against hub rim, DO NOT OVER INFLATE BEYOND THIS STAGE.
3. Deflate tyre, fit valve core and inflate as slowly as reasonably practicable until normal working pressure is reached.
4. Remove airline, fit valve cover and leave the wheel assembly in the inflation cage for a period of time as stipulated in the maintenance manual.
5. Remove the tyre from the cage and carry out periodic static leak checks to ensure the tyre retains pressure.

Question 11

What are the steps for routine tyre inflation?

Answer 11

1. Remove valve cover and check pressure with gauge as detailed in the maintenance manual.
2. Inflate tyre using portable or nitrogen servicing trolley. An adaptor must be fitted in between air/nitrogen source and tyre in order to have regulated control at point of inflation.
3. Refit valve cover.

Question 12

What are the requirements of a skid type undercarriage?

Answer 12

Support weight 
Lightness 
Strength 
Flexibility 
Ground handling