Stopway vs Pre-Threshold Areas

[uwochris]

Hey guys,

Is there difference between a "stopway" and a "pre-threshold area"? They are both marked with yellow chevron arrows; however, a pre-threshold area is a described as a "non-load bearing surface," while a stopway is "prepared as a suitable area in which an a/c can be stopped in the case of an abandonned takeoff." Is there a way to visually distinguish between the two?

Also, does this imply that a stopway is load-bearing? If it is load-bearing and suitable, then why is it only included in ASDA calculations, and not in TORA calculations?

Thanks in advance,

Chris.

 

[EagleRJ]

Not really. Like you said, a stopway is able to support an aircraft after an overrun. A "pre-threshold area" is better described as a paved clearway. Many times, the first few hundred feet of ground off the end of the runway is paved with a thin layer of asphalt to control dust from jetblast. If an aircraft overran the runway onto this paved area, it would go right through the surface, which actually wouldn't be that bad of a thing- it would help stop the plane!