11.13 - Landing Gear

Question 1

Which component of the landing gear supports most of the wait of the aircraft when it’s on the ground

Answer 1

The shock strut

Question 2

How is the action of the shock strut controlled

Answer 2

Gas in the strut provides the shock absorbing function and the oil passing through various passageways provided dampening

Question 3

What is the purpose of the landing gear shortening mechanism

Answer 3

To shorten the gear during retraction, to fit in the wheel well and to increase engine ground clearance

Question 4

Which safety device are in place to prevent the landing gear from being moved into the up position when on the ground

Answer 4

The landing gear selector is physically prevented from being moved to the up position on the ground

Question 5

What is the function of the landing gear solenoid control safety valve

Answer 5

To block the hydraulic supply to the landing gear system at high speeds

Question 6

Which component transfers the tyre pressure information from the rotating point of the wheel to the fixed part

Answer 6

Tyre pressure transducer

Question 7

If the auto brake system is set to auto, when does it start to operate

Answer 7

As soon as the auto speed break system extends the spoilers

Question 8

What is the purpose of the body gear or centreline gear

Answer 8

To spread the aircraft weight over a greater area

Question 9

How is it ensured that the nose leg is correctly positioned before retraction

Answer 9

A set of cams centre the nose wheels as the leg extends

Question 10

Which cockpit indicator is given when the landing gear is all extended and locked

Answer 10

A green light for each leg

Question 11

Which statement is correct regarding the control of the nose wheel steering

Answer 11

The rudder pedals give less deflection than the tiller

Question 12

What happens if the break peddles are manually depressed during auto breaking

Answer 12

The auto brake function disengages and the brakes are controlled as normal by the crew

Question 13

If access to the undercarriage bays of an aircraft is required on the ground, how can the doors be opened

Answer 13

The doors can be unlocked manually by releasing the up lock so they fall under gravity

Question 14

What are the advantages of a nose tricycle gear system over a tail system

Answer 14

Directional stability
Higher landing speeds
Greater decrease in lift after touchdown
Better visibility during taxi and landing

Question 15

What is the function of gas in a shock absorber

Answer 15

It acts as the spring to absorb shock

Question 16

What effect will thrust reverse have on the auto braking system

Answer 16

The auto brake will reduce brake pressure to keep the preselected deceleration rate

Question 17

What is the function of a hydraulic accumulator

Answer 17

To dampen fluctuations in the system

Question 18

What type of load does a static seal withstand

Answer 18

Steady or pulsating loads

Question 19

What is the purpose of the booster pump impeller of a hydraulic pump

Answer 19

Positive pressure to prevent cavitation of pump

Question 20

When are the landing gear doors normally open

Answer 20

During extension and retraction

Question 21

The main purpose of the shock strut is to

Answer 21

Support the aircraft on the ground and absorb shocks on landing

Question 22

The function of the torsion links on the main gear is to

Answer 22

Allow the inner cylinder to move up and down in the outer cylinder but not rotate

Question 23

What is the purpose of the torsion links on damper

Answer 23

To counteract wheel shimmy

Question 24

What is the function of the drag strut

Answer 24

To stabilise the shock strut in the for and aft direction

Question 25

On most aircraft the main landing gear is kept in a retracted position during flight by

Answer 25

There is a mechanical up lock roller that engages the leg and holds it in the retracted position

Question 26

The function of the wiper/scrapper ring is too

Answer 26

Keep all unwanted material out of the shock strut during compression

Question 27

Dynamic seals are used for

Answer 27

Seal the inner cylinder to the gland housing in areas with linear or rotational movement

Question 28

What does the inflight braking system do

Answer 28

It stops the wheel rotation during retraction

Question 29

Which is the main advantage of nose wheel type undercarriage

Answer 29

It allows for better breaking

Question 30

What component transfers the tyre pressure information from the rotating part of the wheel to the fixed part

Answer 30

The tyre pressure transducer

Question 31

What is the function of torsion links on a main gear

Answer 31

It allows the inner cylinder to move up and down in the outer cylinder but not rotate

Question 32

What does a red light on the landing gear position indicator mean

Answer 32

The gear is not locked