Narrative:

I was working the local control position with 2 converging runways in use (runway 17 and runway 13). There were 3 aircraft in the traffic pattern to runway 17 making practice touch-and-goes. All had each other in sight and were doing a good job of following each other. Aircraft #1 called about 12 mi out on a practice ILS approach with gear. I assigned climb out instructions (runway heading maintain 3000 ft) and cleared the aircraft for a touch-and-go on runway 13. I resumed my scan of runway 17, and also began to try and count the tower's last hour of air traffic activity. During this time aircraft #2 called ready for departure on runway 17. I was asking another controller for their help in correctly counting the traffic when I cleared the second aircraft for takeoff. Once airborne, I noticed what appeared to be a double transponder target on the #2 aircraft. At that time, aircraft #1 stated 'tower we are deviating for traffic.' both aircraft were on converging courses toward the apex of the 2 runways. I had failed to remember the aircraft to runway 13. I believe this to be contributed to the new traffic count procedure, which caused me to divert my attention away from the traffic situation. I believe ATC should not be responsible for counting the air traffic activity while actively controling air traffic.

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Original NASA ASRS Text

Title: RPTR CLRED ACFT X FOR A TOUCH-AND-GO ON RWY 13. BECAME DISTR WITH TABULATING HRLY TFC COUNT AND FORGOT ABOUT ACFT X. RPTR THEN CLRED ACFT Y FOR TKOF ON RWY 17. ACFT X HAD TO TAKE EVASIVE ACTION TO MISS ACFT Y.

Narrative: I WAS WORKING THE LCL CTL POS WITH 2 CONVERGING RWYS IN USE (RWY 17 AND RWY 13). THERE WERE 3 ACFT IN THE TFC PATTERN TO RWY 17 MAKING PRACTICE TOUCH-AND-GOES. ALL HAD EACH OTHER IN SIGHT AND WERE DOING A GOOD JOB OF FOLLOWING EACH OTHER. ACFT #1 CALLED ABOUT 12 MI OUT ON A PRACTICE ILS APCH WITH GEAR. I ASSIGNED CLBOUT INSTRUCTIONS (RWY HDG MAINTAIN 3000 FT) AND CLRED THE ACFT FOR A TOUCH-AND-GO ON RWY 13. I RESUMED MY SCAN OF RWY 17, AND ALSO BEGAN TO TRY AND COUNT THE TWR'S LAST HR OF AIR TFC ACTIVITY. DURING THIS TIME ACFT #2 CALLED READY FOR DEP ON RWY 17. I WAS ASKING ANOTHER CTLR FOR THEIR HELP IN CORRECTLY COUNTING THE TFC WHEN I CLRED THE SECOND ACFT FOR TKOF. ONCE AIRBORNE, I NOTICED WHAT APPEARED TO BE A DOUBLE XPONDER TARGET ON THE #2 ACFT. AT THAT TIME, ACFT #1 STATED 'TWR WE ARE DEVIATING FOR TFC.' BOTH ACFT WERE ON CONVERGING COURSES TOWARD THE APEX OF THE 2 RWYS. I HAD FAILED TO REMEMBER THE ACFT TO RWY 13. I BELIEVE THIS TO BE CONTRIBUTED TO THE NEW TFC COUNT PROC, WHICH CAUSED ME TO DIVERT MY ATTN AWAY FROM THE TFC SIT. I BELIEVE ATC SHOULD NOT BE RESPONSIBLE FOR COUNTING THE AIR TFC ACTIVITY WHILE ACTIVELY CTLING AIR TFC.

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.