Re: Birgenair 757 crash - A&C article

From:         Tom Speer <>
Organization: 412th Test Wing / TSFF
Date:         02 Jun 96 16:23:50 
References:   1
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Francis JAMBON wrote:
> What I do not understand is if a pitot probe is blocked. the indicated
> speed must be lower than the air speed, not highter ?

If air is trapped in the pitot tube, then as the ambient pressure decreases
in the climb, the airspeed can read high.  Basically, the delta-p between
field elevation and the current altitude must be greater than the dynamic
pressure corresponding to the airspeed.