Narrative:

This airport has parallel runways. Sometimes, local control is split between 2 local controllers -- one for the west runway and one for the east runway. The lcls were split when the skyhawk reported inbound from the west for touch-and-go operations. Touch-and-go operations are usually conducted on the east runway where I was the controller (runway 17L). I coordinated with the other local controller (runway 17R) to have the skyhawk pilot contact me on a 3 mi right base, so I could integrate him into the pattern with another skyhawk on left downwind. On initial contact, I instructed the right base skyhawk to report the downwind skyhawk in sight. He reported him in sight and I told him he was to follow the aircraft and cleared him for touch-and-go on runway 17L. He read back 'cleared on the right,' which I did not catch. The local west controller put a centurion in position and hold as the second skyhawk turned to final. The skyhawk lined up on runway 17R and I told him to go around about 1/8 mi short of the threshold. He didn't respond and the local west controller cleared the centurion just as the skyhawk passed about 30 ft overhead. I yelled at the local west controller to abort the centurion's takeoff, then told the skyhawk pilot to go around again, which he did. Closest proximity was 30 ft directly overhead. The skyhawk re-entered the pattern and made a normal landing. Callback conversation with reporter revealed the following information: facility specialist advised that dwh has limited approach control authority/authorized, being able to provide separation between arrs and departures.

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Original NASA ASRS Text

Title: C172 MAKES WRONG RWY APCH WITH C210 DEPARTING. DWH E CTLR ALERTS W CTLR TO ABORT C210 TKOF.

Narrative: THIS ARPT HAS PARALLEL RWYS. SOMETIMES, LCL CTL IS SPLIT BTWN 2 LCL CTLRS -- ONE FOR THE W RWY AND ONE FOR THE E RWY. THE LCLS WERE SPLIT WHEN THE SKYHAWK RPTED INBOUND FROM THE W FOR TOUCH-AND-GO OPS. TOUCH-AND-GO OPS ARE USUALLY CONDUCTED ON THE E RWY WHERE I WAS THE CTLR (RWY 17L). I COORDINATED WITH THE OTHER LCL CTLR (RWY 17R) TO HAVE THE SKYHAWK PLT CONTACT ME ON A 3 MI R BASE, SO I COULD INTEGRATE HIM INTO THE PATTERN WITH ANOTHER SKYHAWK ON L DOWNWIND. ON INITIAL CONTACT, I INSTRUCTED THE R BASE SKYHAWK TO RPT THE DOWNWIND SKYHAWK IN SIGHT. HE RPTED HIM IN SIGHT AND I TOLD HIM HE WAS TO FOLLOW THE ACFT AND CLRED HIM FOR TOUCH-AND-GO ON RWY 17L. HE READ BACK 'CLRED ON THE R,' WHICH I DID NOT CATCH. THE LCL W CTLR PUT A CENTURION IN POS AND HOLD AS THE SECOND SKYHAWK TURNED TO FINAL. THE SKYHAWK LINED UP ON RWY 17R AND I TOLD HIM TO GO AROUND ABOUT 1/8 MI SHORT OF THE THRESHOLD. HE DIDN'T RESPOND AND THE LCL W CTLR CLRED THE CENTURION JUST AS THE SKYHAWK PASSED ABOUT 30 FT OVERHEAD. I YELLED AT THE LCL W CTLR TO ABORT THE CENTURION'S TKOF, THEN TOLD THE SKYHAWK PLT TO GAR AGAIN, WHICH HE DID. CLOSEST PROX WAS 30 FT DIRECTLY OVERHEAD. THE SKYHAWK RE-ENTERED THE PATTERN AND MADE A NORMAL LNDG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: FACILITY SPECIALIST ADVISED THAT DWH HAS LIMITED APCH CTL AUTH, BEING ABLE TO PROVIDE SEPARATION BTWN ARRS AND DEPS.

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.