I presume TCAS is talking about the normal V1 reduction on contaminated runways to improve the accel stop performance as a tradeoff against a reduced continued takeoff performance. For a Dash8 on anything much longer than a football field is it all a bit academic ?
No, I wasn't being Type specific, Mutt. The 2 second applies post amendment 42 (if my memory serves me correctly). For earlier aircraft, there is no such requirement, unless mandated by individual Authorities. Additionally, the V1 engine failure sequence on earlier aircraft is more critical than for later machines.
The main significance of the additional 2 second delay was that it represented an attempt to build a bit more fudge into the sequence to acknowledge some of the real world limitations associated with applying the previous accel stop data in runway limiting situations.
Only of interest to highlight to readers that one ought not read current rules and idly presume that they apply to older aircraft.
Great to be back .....
[This message has been edited by john_tullamarine (edited 23 June 2001).]