Forward Instrument Panel (gear)

Question 1

What is the function of the two Landing Gear Control and Interface Units (LGCIUs)?

Answer 1

- Provide sequencing, operation, monitoring, and indications for the landing gear.
- Provide aircraft “In Flight” or “On the Ground” signals to other aircraft systems

Question 2

What hydraulic system powers the landing gear and doors?

Answer 2

GREEN

Question 3

If performing a gravity gear extension, what is one consideration concerning hydraulic power?

Answer 3

Hydraulic power is no longer available to the landing gear system (it is bypassed).

Question 4

When does the red arrow in the LND panel illuminate?

Answer 4

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

Question 5

What happens if airspeed is 280 knots and the Landing Gear lever is selected DOWN?

Answer 5

Nothing. A safety valve shuts off hydraulic power to the landing gear system when airspeed is above 260 knots.

Question 6

What do the red UNLK lights indicate?

Answer 6

 The landing gear is not locked in the selected position.

Question 7

What controls the LDG GEAR lights?

Answer 7

 LGCIU 1

Question 8

If LGCIU 1 fails will the lights still work?

Answer 8

 Yes, as long as it is still powered.

Question 9

What controls and manages all braking functions?

Answer 9

 The Brake and Steering Control Unit (BSCU)

Question 10

What happens when the A/SKID & N/W STRG is switched OFF?

Answer 10

- Loss of nose wheel steering
- Braking is powered by the YELLOW system
- Anti-skid is deactivated

Question 11

Which hydraulic systems provide pressure to the brakes?

Answer 11

- Normal brakes – GREEN
- Alternate brakes – YELLOW backed up by a hydraulic accumulator

Question 12

When do the Auto Brakes activate on landing if armed?

Answer 12

 When the ground spoilers deploy.

Question 13

What is the difference between LOW and MED AUTO BRK?

Answer 13

- LOW – progressive pressure applied to brakes 4 seconds after ground spoilers deploy in order to decelerate the aircraft at a rate of 5.6 ft./s2
- MED – progressive pressure applied to brakes 2 seconds after ground spoilers deploy in order to decelerate the aircraft at a rate of 9.8 ft./s2

Question 14

What does the AUTO BRK green DECEL light indicate?

Answer 14

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

Question 15

What is the Takeoff setting for Auto Brakes?

Answer 15

Max

Question 16

What will cause the MAX AUTO BRK to activate on a rejected takeoff?

Answer 16

- Airspeed above 72 knots, and
- Thrust levers at IDLE, and
- Ground spoiler extension

Question 17

What is the impact of the loss of GREEN hydraulic pressure on the Auto Brakes?

Answer 17

The Auto Brake function is lost, because the aircraft is now relying on the alternate brake system.

Question 18

If on the alternate brake system, what is required in order to maintain Anti- skid function, if anything?

Answer 18

 At least 1 channel of the BSCU

Question 19

What would happen to the spoilers if they were not armed, but at least one engine was selected into reverse thrust?

Answer 19

 They would still deploy, even if they were not armed

Question 20

How many brake applications are available with accumulator pressure?

Answer 20

 Approximately 7 full applications

Question 21

What is the maximum brake temperature for takeoff?

Answer 21

 300°C and BRK FANS OFF

Question 22

What does the BRAKES & ACCU PRESS triple indicator indicate?

Answer 22

- YELLOW hydraulic pressure delivered to the left and right brakes
- YELLOW system brake accumulator pressure

Question 23

Describe the procedure for the brake check prior to taxi. What is the significance of the callouts?

Answer 23

- Press the brake pedals to ensure the aircraft slows, and check the brake pressure on the triple indicator is zero.
- Calling out “pressure zero” indicates the GREEN hydraulic system has taken over, and the normal braking system is operational.