Landing Gear Flashcards
What does two amber XX’s mean in place of a green triangle on the WHEEL SD page?
One LGCIU has failed
When does a green arc appear over brake?
When one brake >100degC
When does an amber arc appear over brake?
When one brake >300degC
Maximum brake temperature for take off without any brake fans? With brake fans?
300degC without fans, 150degC with fans
When do the fusible plugs melt in the tyre? Why do they do this?
When brakes reach 800degC to prevent tyre burst
Maximum speed with landing gear extended? VLE
280kt
Maximum speed for landing gear extension? VLOe
250kt
Maximum speed for landing gear retraction? VLOr
220kt
Maximum tyre speed?
195kts
Maximum wiper operating speed?
230kts
Maximum window open speed?
200kts
4 modes of braking
1) Normal - Green sys; anti skid; autobrake; no pressure indications
2) Alternate with anti skid - Yellow sys; anti skid; no autobrake
3) Alternate without anti skid - anti skid deactivated either:
a) Electrically - BSCU fail, A/SKD NWS switch
b) Hydraulically - Y+G LOW PR -> brakes supplied by accum only - 7 applications
Automatically 1000psi max to avoid wheel lock and tire burst
4) Parking brake- Yellow sys or accumulator
Why is Alternate Braking Without Antiskid limited to 1000psi?
Prevent wheel locking
How many full braking applications on accumulator braking?
7
Describe autobrake deceleration modes
Low - spoiler activation + 2s @ 2/s
Med - spoiler activation + 2s @ 3m/s
Max - when thrust levers are closed above 72kts
When will DECEL light come on?
When 80% of target deceleration achieved
How does anti skid function?
Maintains wheel speed just above impending skid.
Disabled below 20kts
Compares wheel speed to aircraft speed and if not equal releases the brakes
QRH procedures for gear/brakes?
Loss of braking
Gravity gear extension
Landing with abnormal gear
Asymmetric braking
When is Autobrake available?
Normal Brakes
The landing gear panel on the middle console is connected to which LGCIU?
LGCIU 1
How many degrees of nose wheel steering do we get from:
Rudder pedals
Tiller
And at what speed do we have none?
Rudder pedals
+/- 6° progressively less to 130kts
Tiller
+/-75° progressively less to 80kts
On the ECAM
We see NW STRG DISC in green meaning the selector is in the towing position.
When does this memo turn amber?
If one engine is running
Below what speed does anti skid deactivate ?
20kts
Careful tasting
Above what speed to ground spoilers extend?
72kts
Therefore during an RTO autobrake wont kick in unless above this speed!
When does auto brake kick in?
Ground spoiler extension + 2 second delay
Why is the break temp limit 300 degrees?
Because that temp ensures the hydraulic fluid will not ignite in the wheel well.
When does the LDG GEAR safety valve operate?
When the aircraft is flying faster than 260 kt, a safety valve automatically cuts off hydraulic supply to the landing gear system. Below 260 kt, the hydraulic supply remains cut off as long as the landing gear lever is up.
When do the LGCIUs swap?
On gear retraction
What does the red downward facing arrow next to the gear handle indicate?
Gear not downlocked in when in landing configuration
What is the status of the landing gear doors and gear after Gravity Gear Extn?
Doors remain open
Gear cannot be retracted
After RTO with Autobrake, how do you disarm Autobrake?
Disarm spoilers.
Describe general spoiler deployment logic
Similar for RTO and Landing (for RTO, speed must be >72kt)
When will the spoilers deploy:
If spoilers armed - Thrust levers idle (and both gear on the ground)
If spoilers not armed - Reverse selected on at least one engine (and both gear on the ground)
When does the pressure indicator in the cockpit indicate pressure?
Only indicates pressure when the yellow system controls brake pressure:
* Alternate Braking system
* Parking Brake applied
(Top part of gauge shows yellow accumulator pressure)
