Landing Gear Systems

Question 1

What is meant by the ply rating of a tire

Answer 1

The number of plies of cotton fabric needed to produce the same strength as the actual plies in the tire

Question 2

What is the function of the bead in a tire?

Answer 2

the bead is made of high-strength carbon steel wire bundles and used to provide the strength and stiffness where the tire mounts on the wheel

Question 3

Is it proper to use a tube in a tubeless tire?

Answer 3

No, the inner liner of a tubeless tire is rough and it can chafe the tube in normal operation

Question 4

What is the function of the grooves cut into the tread of a tire?

Answer 4

The grooves produce the optimum traction with the runway surface

Question 5

What is the most widely used tread pattern for modern airplane tires?

Answer 5

A series of straight grooves around the periphery of the tire

Question 6

What are the three basic brakes actuating systems

Answer 6

1. An independent system not part of the aircraft main hydraulic system
2. A booster system that uses the aircraft hydraulic system intermittently
3. A power brake system that only uses the aircraft main hydraulic system as a source of pressure

Question 7

What safety precaution must be taken when removing a wheel from an axle or when disassembling a wheel?

Answer 7

Verify that the tire is completely deflated before removing a wheel from an axle or before wheel assembly

Question 8

What are the visible signs of excessive heating on a wheel bearing?

Answer 8

The bearing surfaces show discoloration

Question 9

How are the pilot’s nose wheel steering commands transmitted to the steering control unit of a large aircraft?

Answer 9

Steering signals may be transmitted mechanically, electrically, or hydraulically

Question 10

How is the nose wheel steering mechanism usually actuated on small aircraft?

Answer 10

By means of a mechanical linkage connected to the rudder pedals

Question 11

What is the name of the unit that prevents a nose wheel from vibrating or oscillating?

Answer 11

A shimmy damper

Question 12

What mechanism(s) ensure that the nose wheel is not turned as it retracts into its wheel well?

Answer 12

Internal centering cams in the strut or an external track

Question 13

Name several types of brake actuating systems

Answer 13

1. Independent master cylinders
2. Boosted brakes
3. Power-controlled brakes