31. Forward Instrument Panel (Landing Gear) Flashcards

1
Q

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

A

• Provide sequencing, operation, monitoring, and indications for the landing gear.

• Provide aircraft “In Flight” or “On the Ground” signals to other aircraft systems

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2
Q

What hydraulic system powers the landing gear and doors?

A

Green

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3
Q

When does the red arrow in the LND panel illuminate?

A

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

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4
Q

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

A

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

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5
Q

What do the red UNLK lights indicate?

A

The landing gear is not locked in the selected position.

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6
Q

If LGCIU 1 fails will the lights still work?

A

Yes, as long as it is still powered.

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7
Q

What controls and manages all normal braking functions?

A

The Brake and Steering Control Unit (BSCU)

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8
Q

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

A

• Loss of nose wheel steering

• Braking is powered by the YELLOW system

• Anti-skid is deactivated

• ABCU takes over

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9
Q

Which hydraulic systems provide pressure to the brakes?

A

• Normal brakes – GREEN

• Alternate brakes – YELLOW backed up by a hydraulic accumulator

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10
Q

When do the Auto Brakes activate on landing if armed?

A

When the ground spoilers deploy.

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11
Q

What is the difference between LOW and MED AUTO BRK?

A

• 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

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12
Q

What does the AUTO BRK green DECEL light indicate?

A

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

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13
Q

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

A

• Airspeed above 72 knots, and

• Thrust levers at IDLE, and

• Ground spoiler extension

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14
Q

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

A

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

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15
Q

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

A

At least 1 channel of the BSCU

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16
Q

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

A

They would still deploy, even if they were not armed

17
Q

How many brake applications are available with accumulator pressure?

A

Approximately 7 full applications

18
Q

What does the BRAKES & ACCU PRESS triple indicator indicate?

A

YELLOW hydraulic pressure delivered to the left and right brakes

• YELLOW system brake accumulator pressure