Narrative:

Small aircraft X , a PA 28, was on ILS 30L approach at cps, to be followed on the approach 5 mins later by small transport Y an AC69. The wind was 120 at 11. I advised both aircraft that the cloud bases were reported at 600 ft (right at circiling minima) and that if they broke out higher, a right downwind circle to runway 12R was approved. X reported circling, as Y was making initial call. I instructed Y to report acore (the OM), and advised X to keep pattern in close. Y reported braking out below circling minimums, and would land straight in runway 30L. (Y hadn't reported acore). I looked out and the Y was short final for runway 30L - X was short final runway 12R. I instructed Y to go around, and called stl approach to coordinate missed approach instructions. While I was on the landline with stl approach, Y advised me that Y could land runway 12R. I believe that a loss of standard IFR separation existed, and that a near runway incursion occured (with both aircraft landing opposite direction). In my opinion, Y's failure to report the OM, and the lack of BRITE or tardis radar monitoring equipment contributed to the situation.

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Original NASA ASRS Text

Title: SMT Y NON ADHERENCE TO ATC INSTRUCTION. HAD LTSS FROM SMA X. SYS ERROR.

Narrative: SMA X , A PA 28, WAS ON ILS 30L APCH AT CPS, TO BE FOLLOWED ON THE APCH 5 MINS LATER BY SMT Y AN AC69. THE WIND WAS 120 AT 11. I ADVISED BOTH ACFT THAT THE CLOUD BASES WERE RPTED AT 600 FT (RIGHT AT CIRCILING MINIMA) AND THAT IF THEY BROKE OUT HIGHER, A R DOWNWIND CIRCLE TO RWY 12R WAS APPROVED. X RPTED CIRCLING, AS Y WAS MAKING INITIAL CALL. I INSTRUCTED Y TO RPT ACORE (THE OM), AND ADVISED X TO KEEP PATTERN IN CLOSE. Y RPTED BRAKING OUT BELOW CIRCLING MINIMUMS, AND WOULD LAND STRAIGHT IN RWY 30L. (Y HADN'T RPTED ACORE). I LOOKED OUT AND THE Y WAS SHORT FINAL FOR RWY 30L - X WAS SHORT FINAL RWY 12R. I INSTRUCTED Y TO GAR, AND CALLED STL APCH TO COORDINATE MISSED APCH INSTRUCTIONS. WHILE I WAS ON THE LANDLINE WITH STL APCH, Y ADVISED ME THAT Y COULD LAND RWY 12R. I BELIEVE THAT A LOSS OF STANDARD IFR SEPARATION EXISTED, AND THAT A NEAR RWY INCURSION OCCURED (WITH BOTH ACFT LNDG OPPOSITE DIRECTION). IN MY OPINION, Y'S FAILURE TO RPT THE OM, AND THE LACK OF BRITE OR TARDIS RADAR MONITORING EQUIP CONTRIBUTED TO THE SIT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.