PPRuNe Forums - View Single Post - AF447 wreckage found
View Single Post
Old 1st Jun 2011, 13:44
  #1245 (permalink)  
Dimitris
 
Join Date: May 2009
Location: UK
Age: 41
Posts: 39
Likes: 0
Received 0 Likes on 0 Posts
AoA at less than 60knots

Guys maybe a stupid question:

How does the computer know that airspeed is less than 60knots so as to sound off the stall alarm if the airspeed is unreliable?

What if the plane is stalled at 80knots airspeed and the airspeed is unreliable 'showing' 50 knots. Will the stall alarm sound off?

AoA sensor is a small flap exposed in the airstream, how does the output of it in the cockpit (stall sound) is conected to an airspeed instrument that can be unreliable?

Can anybody expalin why AoA is not available under 60knots? If for some reason speed (reliable or not) is less than 60knots then there is no AoA input for the computers?

I'm obviously not a pilot, but I haven't understood the AoA unavailability under 60knots.
Dimitris is offline