PPRuNe Forums - View Single Post - AA A321 takes off after smashing ground sign
Old 18th Jun 2022, 12:50
  #131 (permalink)  
FlightDetent

Only half a speed-brake
 
Join Date: Apr 2003
Location: Commuting not home
Age: 46
Posts: 4,321
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The vertical orange line marks the moment of rudder zero position.

The green tick 20:40:35.25 marks peak pedal deflection at the "maximum recovery effort" moment. The pedals are hardwired connected, hence only one readout variable.
Same tick is superimposed at start-of-rolling-motion 20:40:32.25, suggesting there was a rudder input about 90% of physical travel - onside.

Still there's a more interesting moment.
from 20:40:31.25
until 20:40:31.75
When L-sidestick (PF) moves from centre to full R deflection in half a second. Strong hand right there, given the spring forces overcome. Is that a reaction to the developing track divergence (zero roll yet, still on the ground)? Wrong as it sounds, it could be - airplane veers to the donwind, we tilt the stick opposite direction. But watch the rudder - at that very moment the pedal deflection doubles into the downwind side.

Then sidestick is released for a second while the left rudder rudder is kept more than 50% of the travel into the roll.




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