Forward Instrument Panel

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

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

Answer 4

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

Question 5

What do the red UNLK lights indicate?

Answer 5

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

Question 6

What controls the LDG GEAR lights?

Answer 6

• LGCIU 1 (Landing gear control interface unit)

Question 7

If LGCIU 1 fails will the lights still work?

Answer 7

• Yes, as long as it is still powered.

Question 8

What controls and manages all braking functions?

Answer 8

• The Brake and Steering Control Unit (BSCU)

Question 9

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

Answer 9

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

Question 10

Which hydraulic systems provide pressure to the brakes?

Answer 10

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

Question 11

When do the Auto Brakes 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 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 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 Auto Brakes?

Answer 14

• MAX

Question 15

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

Answer 15

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

Question 16

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

Answer 16

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

Question 17

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

Answer 17

• At least 1 channel of the BSCU

Question 18

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

Answer 18

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

Question 19

How many brake applications are available with accumulator pressure?

Answer 19

• Approximately 7 full applications

Question 20

What is the maximum brake temperature for takeoff?

Answer 20

• 300°C and BRK FANS OFF

Question 21

What does the BRAKES & ACCU PRESS triple indicator indicate?

Answer 21

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

Question 22

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

Answer 22

• 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.