Landing Gear

Question 1

List the indications for the landing gear doors.

Answer 1

Crosshatched- door not closed

Closed- door closed and locked.

Question 2

List the landing gear systems powered by hydraulic system 1.

Answer 2

Body gear and nose gear extension, retraction and steering.

Alternate brake system.

Question 3

List the landing gear systems powered by hydraulic system 2.

Answer 3

Alternate brake system.

Question 4

List the landing gear systems powered by hydraulic system 4.

Answer 4

Wing gear retraction and extension.

Normal brake system.

Question 5

How is Air and ground mode sensed?

Answer 5

Main gear tilt sensors.

Nose gear squat switch.

Question 6

What is the purpose of the landing gear lever lock?

Answer 6

Prevents movement of the lever to UP on the ground.

Question 7

When will the landing gear automatically depressurise?

Answer 7

With the landing gear retracted and all doors closed.

Question 8

What conditions will result in the EICAS message GEAR TILT?

Answer 8

The main gear trucks are not in the fully tilted position.

Question 9

What is the difference between the main and nose gear extension operation?

Answer 9

Main: gravity operated without hydraulic power to the down and locked position.

Nose: hydraulically powered to the down and locked position.

Question 10

What locks the landing gear in the down position during alternate extension?

Answer 10

Gravity and air loads extend the gear and springs pull the Down links into the locked position.

Question 11

What causes the expanded gear display on EICAS?

Answer 11

GEAR DISAGREE or Operating alternate gear mode.

Question 12

With EICAS GEAR DOOR message displayed, where can the status of the door be viewed?

Answer 12

Gear synoptic page.

Question 13

What is the maximum nose wheel steering angle using the tiller?

Answer 13

70 degrees.

Question 14

What is the maximum steering angle for the rudder pedal operation?

Answer 14

7 degrees.

Question 15

What are the conditions for body gear steering operation (steering angle and ground speed)?

Answer 15

Nose wheel steering > 20 degrees
Ground speed < 15KT

Body gear steering angle is 13 degrees.

Question 16

What will be the indications on the captains panel for loss of hydraulic system 4, 1 and 2?

Answer 16

Brake source light illuminates.

Question 17

State how the anti skid system works (normal and alternate).

Answer 17

Normal: all main wheels are provided with anti skid system.

Alternate: lateral wheel pairs are provided with anti skid instead of individual wheels.

Question 18

How is the landing gear truck prevented from damage during braking?

Answer 18

Brake torque limiter detects excessive torque during braking to prevent damage to landing gear. Signal is sent to the anti skid valve to release brake pressure to that wheel.

Question 19

Describe the conditions for auto rake RTO application during a rejected take off.

Answer 19

• Groundspeed above 85KT.
• thrust levers closed.
• Maximum braking

Question 20

Describe the conditions for autobrake application on landing.

Answer 20

• Thrust levers closed.
• Ground mode sensed.
• Wheels spun up.
• Brake until full stop.

Question 21

How is the parking brake set when no hydraulic systems are pressurised?

Answer 21

Brake Accumulator.

Question 22

What indications are displayed on the gear synoptic?

Answer 22

• Brake temp
• Gear door position
• Tilt
• Antiskid
• Limiter
• Tire Pressure