.. at the end of the day it is only semantics ... on an accel-stop limited runway, the risks are "reasonably" controlled (ignoring surface friction degradation .. lap of the gods stuff that) provided the aircraft, if not ALREADY in stop mode, keeps going at V1. Clearly if the runway has additional margins, then the situation is not so critical .. however, the pilot generally doesn't have the numbers to make an adjustment and the benefits of SOP standardisation are of major importance.
History pretty clearly suggests that the risks in going usually are less than the risks in stopping from the region around V1 ... hence the standard 80/100 kt (according to your preferred flavour) division between routine and only very serious accel-stop manoeuvres.
Vref ... mmmm .... do we really want to get tangled up in that one, Mutt ?
Last edited by john_tullamarine; 1st September 2002 at 13:28.