*Landing Gear-Forward Instrument Panel

Question 1

*What is the function of the 2 Landing Gear Control and Interface Unit (LGCIU)?

Answer 1

-Provide sequencing, operation, monitoring, and indication for the landing gear.
-Provide aircraft “In flight” or “on ground” signals to the other aircraft systems.

Question 2

What hydraulic system powers the landing gear and doors?

Answer 2

Green

Question 3

*What happens if your airspeed is 280 kts and you place the landing gear lever to DOWN?

Answer 3

Nothing. A safety valve shuts off hydraulic power to the landing gear system when airspeed is greater than 260 kts.

Question 4

*What controls and manages all braking functions?

Answer 4

Normal Brakes: The Brake and Steering Control Unit (BSCU)
Alternate Brakes: The Alternate Braking Control Unit (ABCU)

Question 5

*What happens when you switch the A/SKID & N/W STRG to OFF?

4

Answer 5

-Lose NWS
-Braking is powered by the Yellow system
-Anti-skid is deactivated
-BSCU and ABCU are depowered
-A 1000 psi pressure limiting valve helps prevent wheel lock up.

Question 6

*Which hydraulic systems provide pressure to the brakes?

Answer 6

Normal brakes- Green
Alternate brakes-Yellow backed up by an accumulator

Question 7

How many applications are available with the accumulator pressure?

Answer 7

7

Question 8

*When does the red arrow in the LND panel illuminated?

Answer 8

Below 750’ RA, when the aircraft is in the landing configuration and the landing gear is not down and locked.

Question 9

*What do the red UNLK lights indicate?

Answer 9

The landing gear is not locked in the selected position.

Question 10

*What are the four modes of braking?

Answer 10

-Normal
-Alternate with antiskid
-Alternate without antiskid (max brake press 1000 psi)
-Parking Brake

Question 11

*When do the autobrakes activate on landing if armed?

Answer 11

When the ground spoilers deploy.

Question 12

*What is the difference between LOW and MED AUTO BRK?

Answer 12

LOW- Progressive pressure applied to brakes 4 sec after ground spoilers deploy to decelerate at 5.6 fps.
MED- Progressive pressure applied to brakes 2 sec after ground spoilers deploy to decelerate at 9.8 fps.

Question 13

*What does the AUTO BRK green DECEL light indicate?

Answer 13

Actual rate of deceleration is within 80% of the selected rate.

Question 14

*What is the Takeoff setting for the Auto Brakes?

Answer 14

MAX

Question 15

*What will cause the MAX AUTO BRK to activate on an RTO?

Answer 15

Airspeed above 72 kts, and
Thrust levers at IDLE, and
Ground Spoilers extension.

Question 16

*If you lose Green hydraulic pressure, will you have Auto Brakes?

Answer 16

No, not with the Alternate Brake System

Question 17

*Is Anti-Skid available with alternate Brakes?

Answer 17

Yes, if certain conditions are met

Question 18

*With spoilers not armed will the spoilers deploy for an RTO?

Answer 18

Yes- when at least one engine is in reverse

Question 19

*How many brake applications are available with accumulator pressure?

Answer 19

Approximately 7 full applications of brake pedals and/or parking brake.

Question 20

*What does the BRAKE & ACCU PRESS triple indicator indicate?

Answer 20

Yellow Hydraulic pressure delivered to the left and right brakes
Yellow system brake accumulator pressure.