PPRuNe Forums - View Single Post - AF447 Thread No. 3
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Old 28th May 2011, 16:03
  #379 (permalink)  
mitrosft
 
Join Date: May 2011
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peplum

We're not on a river but a jet in the atmosphere.

The wind could be evaluated at max +-75kts in this cas. Even if you add or remove 75kts you're always in the flight domain of the plane using my values !

Anyway think one moment. To fly a plane to must evalute the air speed. Because they were high altitude, and the 3 pitot was off, the only indicator effective at this moment was ground speed.
unless you prefer to open the window and reach out to assess !
I'm not Einstein but I hardly imagine none of the 3 pilots try to use this evident method to adjust thurst and sustain a correct FL
This was exactly my post in 2nd thread. Although for actual flying you do need True Air Speed which is the speed of aircraft relative to given part of the atmosphere, but inertial navigation system should give a very good clue to onboard computer by telling it:

- Hey HAL your air speed dropped from 275knots to 60 knots WITHOUT any decceleration!

-So disregard your speed change and keep the current flying parameters - thrust and pitch. Until deceleration/acceleration tells it that speed changed.

And then give pilots info about unrelaible airspeed.
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