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I'm looking for any data related to accelerate stop distance and runway slope.
For certification you're required to measure the accelerate stop distance using all engines operating for the full test. You might need to reject a takeoff with all engines operating. Reference CAR 525.109(a)(2)(ii) or FAR 25.109(a)(2)(ii).
Part V - Airworthiness Manual Chapter 525 - Transport Category Aeroplanes - Transport Canada