Originally Posted by
tdracer
Why in the world would you continue a takeoff if you had an airspeed disagree before V1?
There have been very bad outcomes when pilots have done just that...
It depends on how soon before V1.
At my airline, we procedurally do an airspeed crosscheck at 80 KIAS, and if they agree we continue. From that point we are in the "high speed" regime and - procedurally - we only reject the takeoff for a narrow set of circumstances, and airspeed disagreement is not one of them. That being said, if I'm lightweight and rolling down a 12,000 foot or more runway, I still might make the decision to reject past the 80 knot point. However, I fully expect to have that decision questioned by both my Chief Pilot and the FAA.