Landing Gear Systems

Question 1

What takes up the shock of the landing impact in an oleo shock strut?

Answer 1

The metered transfer of oil from one compartment to another inside the shock strut.

Question 2

What takes up the taxi shocks in an oleo shock strut?

Answer 2

Compressed air.

Question 3

How much oil should be put into an oleo shock strut?

Answer 3

Deflate the strut completely, remove the filler plug and fill the strut with oil to the level of the filler plug.

Question 4

What is the purpose of the centering cam in a nose-wheel shock strut?

Answer 4

The centering cam forces the nosewheel straight back with the strut before it is retracted into the nose wheel well.

Question 5

How does a shimmy damper keep a nosewheel from shimmying?

Answer 5

It acts as a small hydraulic shock absorber between the piston and the cylinder of the nosewheel shock strut.

Question 6

What is the purpose of the debooster in a hydraulic power brake system?

Answer 6

The debooster decreases the pressure and increases the volume of fluid going to the brakes. This gives the pilot better control of the brakes.

Question 7

What should be done to hydraulic brakes when the pedal has a spongy feel?

Answer 7

The spongy feel is caused by air in the brake. The brakes should be bled of this air.

Question 8

What is used in a split wheel to keep air from leaking between the two wheel halves?

Answer 8

An O-ring seal.

Question 9

What causes an aircraft tire to wear more on the shoulders than in the center of the tread?

Answer 9

Operating the tire in an underinflated condition.

Question 10

What causes an aircraft tire to wear more in the center of the tread than on the shoulders?

Answer 10

Operating the tire in an overinflated condition.

Question 11

What should be done to an aircraft tire if the sidewalls are weather checked enough to expose the cord?

Answer 11

The tire should be scrapped.

Question 12

Why is it important that some aircraft with retractable landing gear be given a retraction test after new or retreaded tires are installed?

Answer 12

It is possible in some aircraft that a new or retreaded tire can be different enough in size from the previous tire that it could lock up in the wheel well when the landing gear is retracted.

Question 13

How is the correct amount of air in an oleo shock strut determined?

Answer 13

By the amount the strut extends out of the cylinder when the weight of the aircraft is on it.

Question 14

What should be done with a tire that was on a wheel which was overheated enough to melt the fusible plug in the wheel?

Answer 14

The tire should be scrapped.

Question 15

Where can you find the correct inflation pressure for the tires on an aircraft?

Answer 15

In the aircraft service manual.

Question 16

What is the purpose of the compensator port in the master cylinder of aircraft brakes?

Answer 16

The compensator port in the master cylinder opens the brake reservoir to the wheel cylinders when the brakes are off. This prevents pressure from building up in the brake lines and causing the brakes to drag.

Question 17

What is the purpose of the shuttle valve in the brake system of an aircraft using hydraulic power brakes?

Answer 17

The shuttle valve is an automatic transfer valve. It allows the brakes to be operated by hydraulic system pressure under all normal conditions, but if this pressure is lost, it allows the brakes to be operated by the emergency backup system.

Question 18

How does an anti skid brake system keep the wheels of an aircraft from skidding on a wet runway?

Answer 18

The antiskid system monitors the rate of deceleration of the wheels. If any wheel slows down faster than it should (as it would at the beginning of a skid) the pressure on the brake in that wheel is released until the wheel stops decelerating, then the pressure is reapplied.

Question 19

Which device in an anti skid brake system would likely cause the brakes to fail to release when a skid developed?

Answer 19

A malfunctioning anti skid valve.

Question 20

Where are the skid detectors located in an anti skid brake system?

Answer 20

In the center of the wheel hub.

Question 21

What is indicated by a red light in the landing gear position indication portion of the annunciator panel?

Answer 21

The red light indicates that the landing gear is not in a safe condition for landing.

Question 22

Where is the landing gear safety switch normally located?

Answer 22

On one of the landing gear shock struts so the switch is actuated when the weight of the aircraft is on the landing gear.

Question 23

What information is given to a pilot to indicate that all of the landing gears are down and locked?

Answer 23

Three green lights are used on most aircraft to indicate that all three landing gears are down and locked.