Re: External inspection

Date:         17 Jan 99 02:37:39 
From:         Seth Dillon <seth.dillon@delta-air.com>
Organization: MindSpring Enterprises
References:   1 2 3
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JF Mezei wrote:
> Rob Montgomery wrote:
> > At the risk of sounding the fool, and admitting not to be an expert,
> > wouldn't the prudent pilot abort the takeoff roll if airspeed
> > indications were severly off the mark (i.e. at the cross-check)? I
> > can't believe that any handling pilot would just eyeball the decision
> > and rotation speeds.
>
> Are V1 and V2 based on airspeed or based on a speedometer controlled by
> landing gear wheels ?
>
> If controlled by airspeed, the above poster has a pretty damm good point: how
> come they would have been able to do the take off roll if their airspeed
> indicators were inop ?

FWIW At my carrier on JT8D powered aircraft, the PNF after setting
takeoff power checks and calls out "N1 greater than 80%".  This is to
confirm that the EPR is close and the engines are actually putting out
TO power.

-Seth