PPRuNe Forums - View Single Post - Using GPS ground speed to resolve Unreliable Airspeed
Old 2nd Jun 2019, 08:40
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yanrair
 
Join Date: Nov 2007
Location: dublin
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Sorry. Someone just asked “ but if AF had just set PITCH POWER etc that should have been enough”
It would have been a good start. But pitch/power can be out by significant margins which can over the next few seconds / minutes degrade the condition. Speed can start falling if power say 2% too low say., due to ISA + 20 for example.
Nose needs to go up. Speed falls more YOU DONT KNOW THIS unless you notice your ground speed falling below where it was, or lower than flight plan.
essentially this is the very point. To sit there allowing the speed to change and knowing it’s happening is - well , not a good idea and can easily lead to
loss of control. I’ve seen this technique used successfully in the sim. Over and over and it works with no drama at all.
Cheers
y
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