ysitincoach said:

Seems the EMAS install was a knee jerk reaction to the Delta Connection 6448/Shuttle America crash. Why don't they have the EMAS system on the main runways?

Quick answer, it is not required on the 6s and 24s.  The FAA about 20 years ago started to require that runways used for commercial use (referred to as Part 139 runways) needed at least a 1000' runway safety area on the end.  Many runways that had already been built, did not meet this criteria due to roads, water, terrain, etc..., 10/28 being one of them.  In the 90's the EMAS system was developed and started to be installed in the late 90's and thoughout the 2000's where a 1000' RSA could not be made.  The RSA improvements are required when the runway itself has major work done on it, so with the rehabilitation of 10/28 that occurred this summer, the RSA improvements had to be done, and since making 1000' RSA was not possible, EMAS was added on the end of each runway to make the runway compliant.  Both 6s and 24s do have at least the required 1000' long runway safety area, so EMAS was not added to them.

This is a good video about EMAS

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