Originally Posted by
Twin Wasp
My question is, do they count EMAS in the equation? If you're runway limited and reject, is it planned that you'll go into the EMAS? And if so, what value does EMAS give you? Is 100 feet of EMAS worth 500 feet of normal pavement or what?
Neither EMAS nor any other available Runway Safety Area is factored into any calculations. The aircraft is supposed to be able to perform within the "accelerate-stop distance available," which includes regular pavement and any declared stopway. Of course, that doesn't always happen - hence the need for Runway Safety Area and/or EMAS.
There is no specific equivalency between regular pavement and EMAS. EMAS performs differently for different aircraft, and is designed specifically for the particular runway considering the "critical" aircraft and the fleet mix that use that runway.
Also, regular pavement provides different benefits depending on whether the aircraft brakes are operational. EMAS performs independent of brakes.