Aircraft Landing Gear systems

Question 1

What are two sources of power used to extend and retract landing gear?

Answer 1

electrical and hydraulic

Question 2

When should landing gear retraction checks be accomplished?

Answer 2

During annual and other type inspections, after replacing landing gear components, and after any
hard landing.

Question 3

What is used to inflate a landing gear shock strut?

Answer 3

Dry air or nitrogen.

Question 4

Where would you look to find proper tire inflation information?

Answer 4

Operation Manual and the Aircraft Maintenance Manual

Question 5

What is the purpose of a hydraulic shimmy damper?

Answer 5

to prevent nose wheel vibrations during taxiing, landing, or takeoff.

Question 6

What type of care should be given to landing gear shock struts?

Answer 6

They should be inspected regularly for leakage of fluid and for proper extension. The exposed piston should be wiped clean daily and inspected for scoring or corrosion.

Question 7

What is the effect of under inflated tires?

Answer 7

Rapid, uneven wear at or near the edges of the tread, and creep or slip when brakes are applied.

Question 8

What is the purpose of the rubber O-ring mounted on the mating surface of the outer wheel half of a split type wheel?

Answer 8

To prevent air leakage.

Question 9

What are three types of aircraft brake actuating systems?

Answer 9

The independent, the power boosted, and the power control type.

Question 10

What is the purpose of a shuttle valve in a power control system?

Answer 10

Each brake actuating line in a power brake system incorporates a shuttle valve for the purpose of
isolating the emergency brake system from the normal brake system. When emergency brake
actuating pressure enters the shuttle valve, the shuttle is systematically moved to the opposite end
of the valve. This closes off the normal hydraulic brake system actuating line and allows the
emergency fluid to actuate the brakes.

Question 11

What component in the landing gear system keeps the landing gear in alignment?

Answer 11

The landing gear torque links.

Question 12

What is used to prevent a nose gear from being retracted with the nosewheel out of the center position?

Answer 12

Nosewheel Centering cams or external track.

Question 13

What is used in a split wheel assembly to keep the air from leaking out between the wheel valves?

Answer 13

An O-ring.

Question 14

What is the purpose of the fusible plug in some aircraft wheels?

Answer 14

It is designed to melt at a specific elevated temperature and relive air pressure to prevent the tire
blowing out

Question 15

How should aircraft tires be stored?

Answer 15

They should be stored in a cool, dry place, away from chemicals, oil, or sunlight.

Question 16

What is the most necessary maintenance function for safe, long, aircraft tire service?

Answer 16

Ensuring they are properly inflated.

Question 17

What safety procedure should be followed when inflating tires in general?

Answer 17

They should be inflated inside of a cage whenever possible.

Question 18

What is the purpose of the anti-skid system?

Answer 18

To bring a fast moving aircraft to a stop during ground roll without tire skidding.

Question 19

What task should be accomplished if the aircraft brakes are spongy?

Answer 19

Bleed the brakes

Question 20

What are two methods of bleeding brakes?

Answer 20

gravity and pressure method.

Question 21

When inspecting brakes, what do you look for?

Answer 21

1. Check for leaks while the system is pressurized.
2. Check flex hoses for swelling, cracking, or soft spots.
3. Check brake pedals for spongy actuation. (This is an indication of air in the system.)
4. Check brake pedals for excessive travel. (This indicates worn linings.)

Question 22

What do you do before disassembling an oleo strut?

Answer 22

Discharge the pressure.

Question 23

What is the purpose of main landing gear torque links?

Answer 23

They keep the landing gear pointed in a straight ahead direction.

Question 24

What type of nosewheel steering is provided on small aircraft?

Answer 24

A simple system consisting of mechanical linkage hooked to the rudder pedals

Question 25

What unit prevents nosewheel vibration?

Answer 25

A shimmy damper.

Question 26

What prevents a split wheel from leaking air through the inner and outer mating surfaces, or the wheel assembly?

Answer 26

An O-Ring between the two assemblies.

Question 27

what is the purpose of a wheel fusible plug?

Answer 27

To relieve air pressure to prevent tire blowout.

Question 28

What is the purpose of power brake debooster cylinders?

Answer 28

They reduce the pressure to the brakes and increase the volume of fluid flow.

Question 29

What methods are used for transmitting cockpit control movements to a steering control unit in large aircraft?

Answer 29

Mechanical, electrical, or hydraulic.

Question 30

What must be accomplished before inspecting a wheel brake system for hydraulic leaks?

Answer 30

Pressurize the system.

Question 31

What is the indication of excessive heating of a wheel bearing?

Answer 31

Discoloration, bluish tint to the metal surface.