Re: Aircraft emissions techie question

Date:         10 Feb 2000 05:03:47 
From: (JWizardC)
Organization: AOL
References:   1
Followups:    1
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Just to throw another level of confusion, I'd like to throw another item
into the V1 discussion. V1, as you already know, is defined as the speed
at which there is no longer enough runway to stop safely on the
pavement. When I give groundschool, I teach that the Pilot Not Flying
should call "V1" at 3 - 5 knots before the computed V1. This gives
another couple of seconds leeway.  The B777/B747-400 aircraft will
automaticly call "V1" at a speed between V1-10 and V1 depending on
customer options.

By the way, US certification requires the aircraft to be stoppable on
the runway (not counting any clearway or extended runway) with only two
seconds between event recognition and rejection. JAA requires three
seconds. As a result of this 'minor' difference, some US aircraft are
rumored to be certified at a lower gross weight by the EU.