Landing Gear Flashcards
What is the function of the two Landing Gear Control and Interface Units (LGCIU)?
º Provide sequencing, operation, monitoring, and indications for the landing gear
º Provide aircraft “In Flight” or “On the Ground” signals to other aircraft systems
When does the red arrow in the LND panel illuminate?
Below 750 feet RA, when the aircraft is in the landing configuration and the landing gear is not locked down
What happens if your airspeed is 280 knots and you place the Landing Gear lever to DOWN?
Nothing - A safety valve shuts off hydraulic power to the landing gear system when airspeed is above 260 knots
What do the red UNLK lights indicate?
The landing gear is not locked in the selected position
What controls and manages all braking functions?
º Normal Brakes: Braking Steering Control Unit (BSCU)
º Alternate Brakes: Alternate Braking Control Unit (ABCU)
What happens when you switch the A/SKID & N/W STRG to OFF?
º Nosewheel steering deactivated
º Brake pressure is supplied by the Yellow hydraulic system
º Anti-skid is deactivated
º BSCU and ABCU are depowered
º A 1000 psi pressure limiting valve helps prevent wheel lock up
Which hydraulic systems provide pressure to the brakes?
º Normal brakes – Green
º Alternate brakes – Yellow backed up by a hydraulic accumulator
What are the four modes of braking?
º Normal braking
º Alternate braking with antiskid
º Alternate braking without antiskid (max brake pressure 1000 psi)
º Parking brake
When do the Autobrakes activate on landing if armed?
When the ground spoilers deploy
What is the difference between LOW and MED AUTO BRK?
º LOW - progressive pressure applied to brakes 4 seconds after ground spoilers deploy to decelerate at 5.6 FPS
º MED - progressive pressure applied to brakes 2 seconds after ground spoilers deploy to decelerate at 9.8 FPS
What does the AUTO BRK green DECEL light indicate?
Actual rate of deceleration is within 80% of the selected rate
What is the Takeoff setting for Auto Brakes?
MAX
What will cause the MAX AUTO BRK to activate on an RTO?
º Airspeed above 72 knots, and
º Thrust Levers at IDLE, and
º Ground spoiler extension
If you lose Green hydraulic pressure, will you have Auto Brakes?
No not with the alternate braking system
Is Anti-skid available with Alternate Brakes?
Yes, if certain conditions are met
With spoilers not armed will the spoilers deploy for an RTO?
Yes – when at least one engine is in reverse
How many brake applications are available with accumulator pressure?
Approximately 7 full applications of brake pedals or parking brake or any combination thereof
What does the BRAKES & ACCU PRESS triple indicator indicate?
º Yellow hydraulic pressure delivered to the left and right brakes
º Yellow system brake accumulator pressure
When brake accumulator pressure is low, how is it recharged?
With the Yellow hydraulic system electric pump
How do you verify the Parking Brake is set?
º ECAM PARKING BRK memo
º Triple indicator brake pressure
If the parking brake is activated and no yellow hydraulic or accumulator pressure is available, do you still have
available braking?
Yes, via the brake pedals, but you must have green hydraulic pressure
How we do charge the yellow system accumulators?
Pressing the yellow hydraulic electrical pump pushbutton
What 3 things occur when you turn the Gravity Gear Extension hand-crank?
º Removes Green hydraulic pressure
º Opens gear doors
º Releases the uplocks
How many turns of the Gravity Gear Extension hand crank does it take to lower the gear manually?
º 3 clock-wise turns
What hydraulic system supplies nose wheel steering?
Yellow
The steering hand wheels can steer the nose wheel up to how much in each direction?
+/-75 degrees
When using the rudder pedals for steering, when does the steering angle begin to reduce?
Starts reduction at 40 knots and progressively reduces to zero degrees at 130 knots
