PPRuNe Forums - View Single Post - AF447 Thread No. 3
View Single Post
Old 28th May 2011, 21:38
  #463 (permalink)  
infrequentflyer789
 
Join Date: Jan 2008
Location: uk
Posts: 857
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by mitrosft
- 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.
Which is what it does, and what happened. With the addition that because speed is known-bad the speed-based protections drop out. And control gets handed to the pilots - because HAL isn't sure what the plane is doing any more.

With no control inputs, the plane should just keep doing what it was doing before, here something causes a roll and pilot responds with full back stick and all hell breaks loose.
infrequentflyer789 is offline