LANDING GEAR AND BRAKES (ASM)

Question 1

How many weight on wheel sensors are there

Answer 1

5

Question 2

What processes the gear proximity switches

Answer 2

Landing Gear Electronic Unit (LGEU)

Question 3

How many signals are processed for an adequate reading

Answer 3

4 signals are processed to ensure 3 are identical

Question 4

What does the nose gear switch send signal to

Answer 4

Thrust lever
Steering
Gust lock
Landing gear downlock

Question 5

Positioning the gear lever up does what

Answer 5

Sends signal to LGEU to close nose gear solenoid and main gear electrovalve

Question 6

Positioning the gear lever down does what

Answer 6

Sends signal to LGEU to open electrovalve and solenoid reaching the actuators and uplocks

Question 7

Purpose of the Electrical Override Extension

Answer 7

Bypass the LGEU actuating the Solenoid and Electrovalve

Question 8

Purpose of the Free Fall Extension

Answer 8

Backup for Normal and Electrical Override

Question 9

What happens when the gear is released with free fall

Answer 9

Unlocks Uplocks
Isolates hydraulic system pressure
Gravity causes gear to fall

Question 10

When does the landing gear warning sound

Answer 10

RA Below 1200
Flaps lower than 22º
Thrust levers below 59º

Question 11

What hydraulic system provides normal braking

Answer 11

System 1 and 2

Question 12

What system provides emergency braking

Answer 12

System 2

Question 13

What controls and monitors normal braking

Answer 13

The BCU

Question 14

Where do BCV 1 and 4 control pressure

Answer 14

Hydraulic System 1

Question 15

What brakes do BCV 1 and 4 control

Answer 15

Outboard wheels

Question 16

Where do BCV 2 and 3 control pressure

Answer 16

Hydraulic System 2

Question 17

What brakes do BCV 2 and 3 control

Answer 17

Inboard wheels

Question 18

Purpose of Anti-Skid Protection

Answer 18

Controls amount of hydraulic pressure to brake
BCU monitors wheel velocity to control skidding

Question 19

When is locked wheel protection activated

Answer 19

Wheel speeds above 30 knots

Question 20

When is Anti-Skid Protection deactivated

Answer 20

Wheel speeds below 10 knots

Question 21

How does locked wheel protection work

Answer 21

if one wheel speed is 30% or lower, pressure is releaved

Question 22

When is locked wheel protection deactivated

Answer 22

Below 30 knots

Question 23

Purpose of touchdown protection

Answer 23

Inhibits brake actuation before main wheel spin up

Question 24

When does touchdown protection occur

Answer 24

3 seconds after touchdown or main wheel speed 50 knots

Question 25

How is nose wheel steering controlled

Answer 25

Electronically controlled, hydraulically operated