AMT AMT Hydraulics, Pneumatics & Landing Gear 2

Question 1

What is the purpose of a shimmy damper on an aircraft nose gear?

Accepted Answer

To absorb and dampen rapid oscillations of the nose wheel

Answer

A shimmy damper uses hydraulic resistance to control and suppress the rapid side-to-side oscillation (shimmy) of the nose wheel during ground operations.

Question 2

Which component absorbs landing shock energy in most aircraft landing gear struts?

Accepted Answer

Oleo (air-oil) pneumatic strut

Answer

Oleo struts use a combination of compressed air/nitrogen and hydraulic oil to absorb and dissipate the energy of landing impact.

Question 3

What safety device prevents accidental retraction of landing gear while the aircraft is on the ground?

Accepted Answer

Weight-on-wheels (squat) switch

Answer

The weight-on-wheels (squat) switch is a safety switch that senses aircraft weight on the gear and electrically prevents retraction while the aircraft is on the ground.

Question 4

What is the typical inflation medium used in aircraft oleo struts?

Accepted Answer

Nitrogen gas and hydraulic oil

Answer

Aircraft oleo struts are typically serviced with dry nitrogen gas (to prevent moisture and oxidation) and hydraulic oil to provide proper shock absorption.

Question 5

What system provides an emergency means of extending the landing gear if the normal hydraulic system fails?

Accepted Answer

Emergency free-fall or alternate extension system

Answer

Aircraft are equipped with an emergency gear extension system that allows the gear to free-fall by gravity and/or uses an alternate hydraulic or pneumatic source if the normal system fails.

AMT - Certified Aircraft Maintenance Technician Practice Test

AMT - Certified Aircraft Maintenance Technician Practice Test

AMT AMT Hydraulics, Pneumatics & Landing Gear 2