A RPTR CAUTIONS THAT MSP RWY 21L TAKEOFF RUN AVAILABLE LENGTH MAY BE ERRONEOUSLY USED IN LIEU OF THE AVAILABLE RWY LENGTH DATA BECAUSE NO EMAS IS INSTALLED.

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WHILE DOING SOME RESEARCH ON EMAS FOR RWY 12L; I DISCOVERED THAT MSP USES A 'DECLARED' DISTANCE ON RWY 12L IN ORDER TO HAVE APPROPRIATE OVERRUN TO ELIMINATE THE REQUIREMENT FOR AN EMAS. THE DECLARED DISTANCE IS 7620 FT. THE FAA AFD; COMMERCIAL CHART 10-9; APG; AND OTHER PUBLICATIONS SHOW THE DISTANCE FOR RWY 12L AS 8200 FT. THAT WOULD MEAN THAT PILOTS AND DISPATCHERS ARE USING TAKE-OFF PERFORMANCE DATA 600 FT MORE THAN WHAT THEY ACTUALLY HAVE. THIS ELIMINATES ANY SAFETY MARGIN. THIS RWY HAS HAD OVERRUNS IN THE PAST. I AM WONDERING IF THE FAA WOULD FIND A PILOT AT FAULT FOR USING FAA PUBLISHED INFORMATION.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT AT LEAST ONE ACR HAS USED THE TORA DATA INSTEAD OF THE ASDA. THE RPTR FEELS THIS MISAPPLICATION PUTS THE FLT CREWS AT RISK OF AN OVERRUN EVENT WITHOUT EMAS AVAILABLE SHOULD A REJECT BE REQUIRED USING THE 8200 FT FULL RWY AVAILABLE. THE RPTR'S INTENTION WITH THIS RPT IS TO MAKE ARPT USERS AWARE OF POSSIBLE DATA MISUSE.