Landing Gear

Question 1

What are the type of struts?

Answer 1

Air/Oil

Question 2

What does the torque knee do on the nose wheel?

Answer 2

Transmits steering motions and nose wheel shimmy damping

Question 3

How are the landing gear doors moved?

Answer 3

Mechanical actions

Question 4

How is the nose gear doors attached?

Answer 4

Via hinges and are spring loaded to open position.

Question 5

How do the nose gear doors retract?

Answer 5

Roller on each side of the assembly engages a cam assembly on each door and draws the doors closed behind the gear

Question 6

How are the main gear doors attached?

Answer 6

Hinged on the sides and connected to an actuator torque-tube assembly with 2 push pull links

Question 7

How is the landing gear controlled?

Answer 7

Electrically controlled, hydraulically actuated

Question 8

How is the landing gear held in a down position? Up position?

Answer 8

Folding braces called “drag legs,” mechanical downlocks.

Held up by hydraulic pressure

Question 9

How is hydraulic power supplied to the system?

Answer 9

A hydraulic power pack

Question 10

What controls the flow of hydraulic fluid to individual gear actuators?

Answer 10

Electrically actuated selector valve - which receives power from the landing gear control switch

Question 11

How is the gear extended and retracted?

Answer 11

Via a hydraulic power pack

Question 12

There are 3 hydraulic lines which run from the power pack - what are they for?

Answer 12

Normal extension, retraction, and emergency extension which is all routed to the nose and main gear actuators

Question 13

Where are the normal and manual extension lines connected to the hydraulic actuator at?

Answer 13

Upper end

Question 14

How long will the pump motor run?

Answer 14

Until all three landing gears are down and locked

Question 15

At what PSI does the nose gear actuator unlock at?

Answer 15

200-400 PSI of hydraulic pressure

Question 16

When the hydraulic pressure reaches _____, the uplock pressure switch will cause the landing gear relay to open and interrupt the current to the pump motor

Answer 16

1,850 PSI

Question 17

What happens if the hydraulic pressure drops to 1,600 PSI?

Answer 17

The pressure switch will cause the pump to actuate

Question 18

What mechanism do the squat switches control?

Answer 18

Down lock hooks

Question 19

When do the downlock hooks unlock?

Answer 19

When the plane leaves the ground

Question 20

What does the red light in the gear handle mean?

Answer 20

The gear is in transit or in an unsafe position

Question 21

What’s the purpose of up limit switches?

Answer 21

To actuate when the gear is fully up to allow the system to know that it is actually up

Question 22

What does the down limit switch also function as?

Answer 22

A warning system

Question 23

When will the landing gear in transit light illuminate?

Answer 23

Landing gear handle in up position and airplane is on the ground

Flaps up or approach and one or both power levers retarded below 79 +- 2% N1, one or more landing gears are not down and locked

Any landing not in fully retracted position

Flaps are beyond the approach position (36% or more) with any gear not down, regardless of power lever position

Question 24

Name the different scenarios when the landing gear warning horn will go off

Answer 24

Gear up, flaps up, power -77% to +81% (silence by button)

Gear up, flaps approach, -77% to +81% (silence by button)

Gear up, flaps past approach, any power setting (silence by lowering gear)

Question 25

What’s the process for letting the gear down manually?

Answer 25

Pulling landing gear relay circuit breaker, put landing gear control in the down position, remove pump handle from securing clip, pump the handle down until the green gear lights illuminate and resistance is felt

Question 26

What are the type of brakes?

Answer 26

A non-assisted hydraulic brake system

Question 27

What’s the main gear brakes equipped with?

Answer 27

Multi-disc hydraulic brakes