Plain English Meaning
An FAA guidance document that tells airports how to design and build the crushable concrete beds at the end of runways that stop aircraft if they roll off the far end.
Full Definition
An FAA Advisory Circular titled 'Engineered Materials Standards for Aircraft Overruns,' which sets the design and performance standards for Engineered Materials Arresting Systems (EMAS) installed at the ends of airport runways to safely decelerate aircraft that overrun the runway.
Context Anchor
Seen in FAA handbook references, figure captions, and airport design discussions about EMAS installations at runway ends.