PPRuNe Forums - View Single Post - Airspeed active. Why say that?
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Old 18th Jan 2003, 01:53
  #11 (permalink)  
mustafagander
 
Join Date: Jun 2001
Location: OZ
Posts: 1,130
Received 12 Likes on 6 Posts
Lumpy,

Chill out a bit.

Calls to confirm airspeed alive are to ensure that the ASI is, in fact working. Not too long ago an a/c (in Central America, I think) got airbourne and flew for a while with all ASIs inop. Nasty, fatal crash. Good idea to ensure they're working, yes?

Positive rate of climb calls confirm that the weight is off the wheels, the a/c has enough attitude to start climbing away and it is safe to retract the gear.

If you have any sort of instrument rating you ought to have had it kicked into you to confirm climb and stay on the dials at least for the initial climb due somatographic illusion. In short, your inner ear cannot tell if you are accelerating or tilting your head. The little thingos in your middle ear are called "otoliths" I think. Roughly, they are hairs with a little weight on the end so that they will move under the conditions mentioned, acceleration OR attitude, and the sensation is the same.

How it kills you is so frighteningly simple - you rotate off the runway, especially one aiming out over the sea or other very dark place and not look carefully at attitude and your inner ear senses increasing pitch up as you accelerate (it's what you are expecting, so that's how your brain interprets it), so you push forward to limit attitude and not overrotate. This gives more acceleration, hence push more etc, etc, and you hit the ground/water at high speed. Your inner ear has just killed you.
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