ACR X GAR HAD NMAC WITH ACR Y TKOF.

Narrative

ACR X ON ARR AT DFW OUTSIDE THE OM FOR RWY 18L; WE WERE CLRED TO LAND WITH ONE ACFT TO DEPART IN FRONT OF US. DUE TO AN EARLIER REQUEST TO KEEP OUR SPD UP TO THE MARKER; OUR APCH SPD WAS NOT BACK TO MINIMUM UNTIL ABOUT 500 FT. THE ACFT ON TKOF WHEN WE ARRIVED AT 300 FT APPEARED TO NOT HAVE STARTED ITS ROLL AND WE ELECTED TO GAR IN THE EVENT OF AN ABORT OR LATE ROTATION. AT THIS POINT OUR SPACING WITH THE ACFT WAS SO CLOSE WITH HIM BENEATH US AND STILL ON RWY HDG. TWR TOLD US TO FLY HDG OF 170 DEGS AS HE WOULD BE TURNING R AS WE WERE ALREADY PARALLELING THE R SIDE OF THE RWY. WITH THE CAPT FLYING TO KEEP ACFT IN SIGHT WE TOLD THE TWR UNABLE TO COMPLY AND INDICATED WE WOULD KEEP ACFT IN SIGHT TURNING TO THE R WITH THE DEPARTING ACFT LOW AND L. WE WERE FINALLY TOLD TO CLB TO 3000 FT AND COME FURTHER R FOR VECTORS FOR RWY 13R. SUPPLEMENTAL INFO FROM ACN 310649: ACR X WAS CLRED TO LAND ON RWY 18R BY TWR ON INITIAL CONTACT. WAS SUBSEQUENTLY TOLD THAT AN ACFT WAS CLRED ON TO HOLD. AT 300 FT AGL; THE PRECEDING ACFT WAS JUST COMMENCING HIS TKOF ROLL. AS WE CONTINUED; IT WAS APPARENT TO US THAT THE SPACING WAS TERRIBLY INSUFFICIENT AND WE ELECTED TO GAR AND MADE OUR INTENTIONS KNOWN TO THE AIR TFC CTLR. SHE RESPONDED THAT THE ACFT WAS IN A R TURN AND CLRED US TO LAND. AT THIS POINT WE LOOKED AT ACR Y AS WE WERE OVERTAKING IT RAPIDLY FROM THE R AND NOTICED THAT IT HAD NOT EVEN LIFTED OFF YET. THE CTLR WANTED US TO FLY A 170 DEG HDG WHICH WOULD HAVE MADE US PASS RIGHT OVER THE TOP OF Y; AT ABOUT 100-200 FT AGL; ALSO LOSING SIGHT. WE IMMEDIATELY REFUSED THE HDG AND CONTINUED TO OFFSET TO THE R OF CTRLINE TO KEEP THE Y IN VIEW AS WE PASSED IT TO THE R. THE CTLR WAS NOTICEABLY IRRITATED THAT WE REFUSED HER CLBOUT HDG THAT WOULD HAVE PLACED BOTH ACFT ON CONVERGING AND EXTREMELY UNSAFE CONDITIONS.