Our E-Jets are ISA+15C, its the other end of the envelope that they are playing with. (But as i havent seen the new envelope yet, i stand to be corrected). I know that the N1 is always constant below the min assumed temperature, but my question is, why do we have to use it? Why complicate the procedure more than it needs? Isnt it realistic to have the crews to exactly the same calculation everytime and just accept that below the Min Assumed, the thrust wont change?
the 25% reduction is applicable to the Rated Thrust or De-Rated Thrust
Thats what i was getting at, we operate some aircraft with 3 ratings, we can apply assumed derates of 25% to all of them, so in reality we can reduce thrust by around 45%.
Chris, what VREF are you talking about?
I don't think computers are capable of doing that
Yep they are, in fact the pencil is so sharp that Boeing will offer you 4-8000 kgs additional takeoff weights in some hot/high airports, same aircraft, same AFM, just using a sharper computer powered pencil
Mutt