AMT Aircraft Landing Gear Systems

Question 1

What is the primary purpose of a shimmy damper on aircraft landing gear?

Accepted Answer

To prevent oscillation of the nose wheel assembly

Answer

To absorb vertical shock loads during landing

Answer

To control the rate of gear retraction

Answer

To provide steering input to the nose wheel

Question 2

In an oleo-pneumatic shock strut, landing shock is cushioned primarily by:

Accepted Answer

Nitrogen gas compression and hydraulic fluid metering through orifices

Answer

A coil spring compressed by the piston

Answer

Rubber biscuits compressed between metal discs

Answer

A leaf spring assembly attached to the axle

Question 3

Torque links (scissors links) on an oleo shock strut serve to:

Accepted Answer

Prevent rotation of the piston while allowing axial (vertical) movement

Answer

Allow free rotation of the piston within the outer cylinder

Answer

Provide steering input to the nose wheel during ground operations

Answer

Lock the landing gear in the fully extended position

Question 4

What type of landing gear arrangement is most commonly used on modern large transport aircraft?

Accepted Answer

Retractable tricycle gear

Answer

Fixed tricycle gear

Answer

Conventional (tailwheel) gear

Answer

Bicycle gear with outriggers

Question 5

The purpose of a downlock in a retractable landing gear system is to:

Accepted Answer

Hold the landing gear in the fully extended position during flight

Answer

Prevent the gear from retracting accidentally while on the ground

Answer

Lock the gear doors closed after the gear extends

Answer

Prevent the wheels from spinning during gear retraction

Question 6

Proper aircraft wheel bearing preload is important because:

Accepted Answer

Proper preload prevents both excessive play and heat buildup from overtightening

Answer

It prevents the bearing races from separating under radial loads only

Answer

Excessive preload always extends bearing service life

Answer

Preload allows bearings to operate without lubrication

Question 7

An anti-skid brake system prevents wheel lockup by:

Accepted Answer

Automatically releasing and reapplying brake pressure to allow the wheel to spin up

Answer

Increasing hydraulic pressure to the brakes when a skid is detected

Answer

Mechanically limiting brake pedal travel at a fixed position

Answer

Reducing engine thrust when wheel skidding is detected by sensors