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...
The reason to reject above 80kts, and before V1, are very narrow. The only one that unreliable airspeed would potentially fall under is ‘Unsafe or unable to fly’- Is the aircraft actually unsafe to fly? Now your next decision, what is actually your V1? You don’t have a reliable airspeed indication, so V1 is not accurate.
At this point, do not be lulled into trying to diagnose the reliable airspeed, as per the Boeing checklist and FCTM, you are not in a position to be doing this until you are sat stable and in trim, at a pre determined pitch and power for the phase of flight from the QRH.