John Tullamarine is away for a while, so I’m going to answer the easy questions first.
Code_Blue,
The manufacturers data is usually broken down into discrete segments, these are engine failure recognition / brake application / thrust levers to idle position / speed brake actuation. A 2 sec delay is added to account for differences in pilot reaction.
On older aircraft such as the 707/737-100/200 V1 is the engine failure and recognition speed.
On newer aircraft (733/744/757/767) certification is based on the engine failing 1 second prior to V1 (VEF), The brake application is conducted at the same time as the engine failure recognition (V1). Throttle chop and brake application follow. All of this is derived from demonstrated flight testing. The rules then require a 2 second arbitrary time delay to be used to calculate the distance based on full braking with no deceleration credit. Thrust reversers are not used in these calculations.
Mutt.
[This message has been edited by mutt (edited 15 June 2001).]