757 = Heavy?
The next question rose during a discussion between my captain and me during my last tour:
I seem to remember, just as many colleages of mine, that the B757, which due to it's weight is categorized as Medium, should be considered, by aircraft taking off behind him, as Heavy, due to it's vortices. Therefore, flying an A320, we should wait two minutes. In Heathrow we only got 1 minute and there we started to discuss the matter (offcourse, becouse we were not sure we took 2 mins). We both seemed to remember this 757-exception, but we couldn't find it anywhere. Not in the JAR, not in our company-regulations etc.
Does anyone know where this "rule" comes from and where it is written??
Thanks!
P77