ACR TAKES ABRUPT EVASIVE ACTION DIVE TO AVOID MIDAIR WITH SMA JUST AFTER DEP AT COS.

Narrative

I WAS PF AND PIC OF FLT DEPARTING RWY 17 AT COS. AS THE WHEELS WERE JUST COMING INTO THE WELLS (I GUESS AN AGL OF 600-750 FT BUT CANNOT BE SURE AS I WAS LOOKING OUTSIDE). I SAW THE LNDG LIGHT OF AN SMA COMING FROM THE L SIDE OF MY ACFT AND SLIGHTLY HIGHER. I PROMPTLY PUSHED THE NOSE OVER TO LEVEL OR SLIGHTLY DOWN AND PULLED OFF PWR. THE SMA PASSED DIRECTLY OVER MY ACFT AS I SAW HIS UNDERBELLY THROUGH MY EYEBROW WINDOW. I'M SURE YOU HEAR THIS ALL THE TIME BUT BOTH MY COPLT AND I AGREE: IF I HAD NOT TAKEN EVASIVE ACTION THE RESULT WOULD HAVE BEEN A MID AIR COLLISION. I HAVE DISCUSSED THIS WITH A SUPVR AT COS AND BEEN TOLD THAT: THE CTLR WAS FPL. THE SMA SHOULD NOT HAVE BEEN GIVEN R TFC PATTERN FOR RWY 12 (SHOULD HAVE BEEN GIVEN L PATTERN). I SHOULD HAVE BEEN TOLD OF POSSIBLE TFC (I WAS NOT -- TAPES REVIEWED). I AGREE WITH THE SUPVRS CONCLUSIONS AND ONLY WISH THAT THE RADAR WAS ABLE TO RECORD THIS INCIDENT FOR USE IN FUTURE TRAINING AT THE ACADEMY. THIS WAS A CLASSIC LOSS OF SEPARATION WHICH ALMOST MADE THE 5 O'CLOCK NEWS. AN NMAC RPT IS BEING FILED WITH FAA (DEN FSDO).