See
UK AIC information on RTO. This is based on JAR/CS 25 certification requirements which have (as far as possible) been harmonized with FAR.
The decision speed (V1) is the highest speed by which the pilot should have made the mental decision to reject the take-off in the event of a relevant failure.
A recognition period (distance) is included in the certificated data – Vef is prior to V1; crews need not be concerned with the technicalities, just respect V1.
A period (distance) after V1 is provided in the calculations to enable completion of the RTO drills, again crews need not be concerned with these values; perhaps more so with the accuracy of the speed setting and total distance required to stop.
It might be of greater importance to understand what failure or condition determines the need for a RTO as opposed to time periods, and then preparedness for timely and correct action if the decision is to stop, e.g. apply maximum braking. Beware the human limitation from time dilation in judgments made in stressful conditions.
Does anyone have procedures that require manual braking even if auto brake is selected – mitigates any error in setting autobrake?
Note new
UK AIS web site.
Also, see ‘accelerate-stop time delays’
AC 25-7A Flight test guide for certification of transport category airplanes. Chapt 2, a good diagram on page 80/9.