A DC9 WHILE OVER THE APCH END OF RWY 21R MAKES A GAR WHEN THE SPACING BTWN THEM AND A DEP B727 IS SUSPECT. THE B727 HAD A TKOF DELAYED DUE TO A DC9 THAT WAS SLOW IN CLRING RWY 21R AT DTW; MI.

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WE WERE ON A VISUAL APCH TO DTW TO RWY 21R FOLLOWING A DC9 WHO RPTED AN AIRSPD OF 200 KTS OUTSIDE OF ILPUT; AND SLOWING. I HAD THE DC9 IN SIGHT AND HAD LOTS OF SPACE BTWN US. SO I KEPT IT AT 200 KIAS UNTIL OUTSIDE OF ILPUT. WE CHANGED TO TWR AT ILPUT AS THEY CLRED A B727 INTO POS. WE WERE CLRED TO LAND AND TO SLOW TO FINAL APCH SPD; WHICH I HAD ALREADY STARTED TO DO. THE LNDG DC9 STAYED ON THE RWY LONGER THAN MOST DO AND WAS TOLD TO EXPEDITE ABOUT THE TIME THEY WERE TURNING OFF. THE B727 WAS CLRED FOR IMMEDIATE TKOF WHICH THEY DID. AS WE DSNDED TO ABOUT 100 FT THE CAPT TOLD ME TO GO AROUND. I LOOKED UP AND SAW THE B727 STILL ON THE RWY AND HAD NOT YET ROTATED; SO IT MUST HAVE BEEN HVY. WE REJECTED THE APCH AND WENT AROUND EVEN THOUGH DTW TWR DID NOT TELL US TO GO AROUND. WE SHOT ANOTHER VISUAL APCH TO RWY 21R AND LANDED WITHOUT ANY FURTHER PROBS. I THINK THIS WAS GOOD JUDGEMENT ON THE PART OF THE CAPT; FOR IF THE B727 HAD NOT YET REACHED V1 AND REJECTED THE TKOF AND WE HAD LANDED; BOTH ACFT WOULD HAVE BEEN ON THE SAME RWY AT HIGH SPDS AND IN VIOLATION OF FAR'S. SUPPLEMENTAL INFO FROM ACN 473983: THE B727 DIDN'T APPEAR TO HAVE ROTATED FOR TKOF AND IT WAS MY JUDGEMENT WE WOULD BE TOUCHING DOWN BEFORE THE B727 LIFTED OFF. WE NEVER HEARD DTW TWR SEND US AROUND AND DON'T BELIEVE THEY EVER ATTEMPTED TO.