something new for the discussion on RTOs
To add something new to the discussion.... I noticed several comments on Flex/Assumed Temperature Method (ATM) takeoffs in relation to RTO performance. I wonder if crews know what the impact might be on the actual stopping distance during an RTO. Below is the engineering answer to this.
The accelerate-stop distance in FLEX/ATM is based on the true airspeed at the assumed temperature. This assumed distance is the basis for the takeoff performance. As the actual true airspeed (which is based on actual OAT) during takeoff is lower, the actualaccelerate-stop distance would be shorter than the assumed distance. This means, there is always some additional stopping margin when using Flex/ATM.
See: Takeoff Performance Optimization: Balancing Thrust Reduction and Stopping Margin by Dennis Ting, Meghan Nelson, and Greg Haselfeld, The Boeing Company