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