Look at the difference in TAS.......
Mutt
THIS is the key item in understanding the inherent margins in flex operations.
The aircraft achieves rated-thrust AFM performance at 40C; and using this same thrust on a 15C day, it also makes rated performance but at a TAS (inertial speed) 6 or 7 kt slower. Thus less runway is used, and less ROC is required to make the climb gradient.
As I've said before, I'm perfectly happy with
RainingLogic bending his throttles day after day, because that's how my employer makes money on spare parts sales, and that means a better pension and dividends for me. But he can't expect his ideas to gain traction in an industry that makes MANY more takeoffs, and sails or fails on takeoff-related costs.
