Further to JT's briefing-amendment 42(1978) the definition of VEF(when the constructor fails the engine prior to V!)was made public to the crew.Up until this time it was only used by the FAA/builder on the Cert'Test' card.Now the crew knew that one must'recognize' the failure ,and react ,prior to V!.The 2 sec time was added to the 'Distance'required to the AccStop distance.
this lead to the Boeing/airbus controversy in that Boeing put forth it's 767 proposal early(1978) ,ergo avoiding the 2sec requirement ,
and 'selling' their aircraft as using less runway...
