Narrative:

Small aircraft X on final talking to local and small aircraft Y sequenced to follow the small aircraft X. Small aircraft Y saw and acknowledged who he was to follow. He changed frequency, but to mcconnell ground instead. He overran the small aircraft X but didn't land as he had no landing clearance. Small aircraft X saw the small aircraft Y pass above and to her left. The trnee whom I was watching and I tried to call small aircraft Y when he appeared to overtake small aircraft X, but to no avail. He issued instructions to small aircraft X to make a right 270 away from final. Traffic was moderate to heavy on a 1 runway operation. This could possibly have been prevented if small aircraft Y had the appropriate frequencys. It appeared that the pilot was low time and somewhat disoriented when he called initially on radar. Callback conversation with reporter revealed the following. Small aircraft Y told approach control that he had the small aircraft X in sight and was advised to follow that aircraft. Tapes showed that approach control gave small aircraft Y a frequency change and had indicated the proper tower frequency. Not known why the small aircraft Y changed to the wrong frequency. Tower controllers were using both BRITE radar and visual scan out the window to judge aircraft position. When overtake was observed, both the trnee and the reporter tried to contact the small aircraft Y, but were unable. Small aircraft X was given turn and resequenced behind the other aircraft. Apparently, small aircraft Y was low time pilot and got confused. Incident was classified as a pilot deviation.

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Original NASA ASRS Text

Title: SMA OVERTOOK ANOTHER SMA ON FINAL AND WAS ON WRONG FREQ. TWR INTERVENED AND TURNED TO FIRST SMA FOR SEPARATION.

Narrative: SMA X ON FINAL TALKING TO LCL AND SMA Y SEQUENCED TO FOLLOW THE SMA X. SMA Y SAW AND ACKNOWLEDGED WHO HE WAS TO FOLLOW. HE CHANGED FREQ, BUT TO MCCONNELL GND INSTEAD. HE OVERRAN THE SMA X BUT DIDN'T LAND AS HE HAD NO LNDG CLRNC. SMA X SAW THE SMA Y PASS ABOVE AND TO HER LEFT. THE TRNEE WHOM I WAS WATCHING AND I TRIED TO CALL SMA Y WHEN HE APPEARED TO OVERTAKE SMA X, BUT TO NO AVAIL. HE ISSUED INSTRUCTIONS TO SMA X TO MAKE A RIGHT 270 AWAY FROM FINAL. TFC WAS MODERATE TO HEAVY ON A 1 RWY OPERATION. THIS COULD POSSIBLY HAVE BEEN PREVENTED IF SMA Y HAD THE APPROPRIATE FREQS. IT APPEARED THAT THE PLT WAS LOW TIME AND SOMEWHAT DISORIENTED WHEN HE CALLED INITIALLY ON RADAR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING. SMA Y TOLD APCH CTL THAT HE HAD THE SMA X IN SIGHT AND WAS ADVISED TO FOLLOW THAT ACFT. TAPES SHOWED THAT APCH CTL GAVE SMA Y A FREQ CHANGE AND HAD INDICATED THE PROPER TWR FREQ. NOT KNOWN WHY THE SMA Y CHANGED TO THE WRONG FREQ. TWR CTLRS WERE USING BOTH BRITE RADAR AND VISUAL SCAN OUT THE WINDOW TO JUDGE ACFT POS. WHEN OVERTAKE WAS OBSERVED, BOTH THE TRNEE AND THE RPTR TRIED TO CONTACT THE SMA Y, BUT WERE UNABLE. SMA X WAS GIVEN TURN AND RESEQUENCED BEHIND THE OTHER ACFT. APPARENTLY, SMA Y WAS LOW TIME PLT AND GOT CONFUSED. INCIDENT WAS CLASSIFIED AS A PLT DEVIATION.

Data retrieved from NASA's ASRS site as of August 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.