Narrative:

I was working the local control south position at dvt. I had a symphony on downwind with a bonanza entering downwind to follow the symphony. I extended the symphony on downwind to allow room for 2 departures. I then asked the symphony to turn base. At this time, an archer from a flight school called off scottsdale inbound. The archer was told to report 1 mi east of cave creek road (a 4 mi final runway 25L). At this time the symphony was on final with the bonanza turning final. Shortly thereafter, the archer reported and was sequenced to follow the bonanza and asked if he had the bonanza in sight. The archer stated he had passed the bonanza. The bonanza stated 'that was close.' I instructed the archer to make a left 360 degree turn, roll out on final to follow the bonanza. I then told the bonanza the archer was inbound from scottsdale and was evidently closer than his report. The bonanza pilot stated that situation would 'make him no less dead.' I encouraged the pilot to call the facility. He stated it never helps. We then landed and the ground controller discussed the importance of not making comments on frequency and to call the facility. He stated he would not call. He later filed an near midair collision. Factors: the importance of realistic reporting points. At the point the archer reported a 4 mi final he had already passed the bonanza. This would have meant the bonanza turned base to final further than that the bonanza was in the pattern -- that was not the case. The archer was closer -- a couple of mi in a VFR tower is a lot of space and important to local controllers.

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Original NASA ASRS Text

Title: DVT CTLR EXPERIENCED NMAC WITH 2 ACFT IN THE PATTERN.

Narrative: I WAS WORKING THE LCL CTL S POS AT DVT. I HAD A SYMPHONY ON DOWNWIND WITH A BONANZA ENTERING DOWNWIND TO FOLLOW THE SYMPHONY. I EXTENDED THE SYMPHONY ON DOWNWIND TO ALLOW ROOM FOR 2 DEPS. I THEN ASKED THE SYMPHONY TO TURN BASE. AT THIS TIME, AN ARCHER FROM A FLT SCHOOL CALLED OFF SCOTTSDALE INBOUND. THE ARCHER WAS TOLD TO RPT 1 MI E OF CAVE CREEK ROAD (A 4 MI FINAL RWY 25L). AT THIS TIME THE SYMPHONY WAS ON FINAL WITH THE BONANZA TURNING FINAL. SHORTLY THEREAFTER, THE ARCHER RPTED AND WAS SEQUENCED TO FOLLOW THE BONANZA AND ASKED IF HE HAD THE BONANZA IN SIGHT. THE ARCHER STATED HE HAD PASSED THE BONANZA. THE BONANZA STATED 'THAT WAS CLOSE.' I INSTRUCTED THE ARCHER TO MAKE A L 360 DEG TURN, ROLL OUT ON FINAL TO FOLLOW THE BONANZA. I THEN TOLD THE BONANZA THE ARCHER WAS INBOUND FROM SCOTTSDALE AND WAS EVIDENTLY CLOSER THAN HIS RPT. THE BONANZA PLT STATED THAT SIT WOULD 'MAKE HIM NO LESS DEAD.' I ENCOURAGED THE PLT TO CALL THE FACILITY. HE STATED IT NEVER HELPS. WE THEN LANDED AND THE GND CTLR DISCUSSED THE IMPORTANCE OF NOT MAKING COMMENTS ON FREQ AND TO CALL THE FACILITY. HE STATED HE WOULD NOT CALL. HE LATER FILED AN NMAC. FACTORS: THE IMPORTANCE OF REALISTIC RPTING POINTS. AT THE POINT THE ARCHER RPTED A 4 MI FINAL HE HAD ALREADY PASSED THE BONANZA. THIS WOULD HAVE MEANT THE BONANZA TURNED BASE TO FINAL FURTHER THAN THAT THE BONANZA WAS IN THE PATTERN -- THAT WAS NOT THE CASE. THE ARCHER WAS CLOSER -- A COUPLE OF MI IN A VFR TWR IS A LOT OF SPACE AND IMPORTANT TO LCL CTLRS.

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.