Narrative:

At approximately XX13L, small aircraft X departed runway 17L from abi, assigned 150 degree heading by the tower, en route to fort worth meacham airport. Small aircraft Y was on a VOR-a approach to abi, instructed to circle east of the airport for a left downwind to runway 17L. When small aircraft Y reached the airport he declined the circle and executed his instructed missed approach heading 120 degrees, climbing to 4000'. The 2 aircraft contacted approach simultaneously and only the small aircraft X was heard. Small aircraft X was issued a heading of 070 degrees climbing to 9000'. Approximately 55 seconds later small aircraft Y made initial contact with the departure controller. On initial contact the small aircraft Y was 500' and approximately 1 mi northwest of the small aircraft X on a converging course. The small aircraft X was instructed to turn right immediately heading 120 degrees. The small aircraft Y pilot then reported small aircraft X in sight. During the situation described above I was in contact with 8 aircraft, 7 aircraft were on radar vectors, all positions were combined and 10 radio frequencys were in use. Causal factors: frequency congestion; lack of coordination between tower and approach controllers; and human error, in that my attention was drawn to a difficult sequence at the adjacent AFB and became focused on that situation instead of having good overall situational awareness. I believe this situation could be avoided in the future by developing procedures to avoid frequency congestion and by more effective coordination between controllers.

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Original NASA ASRS Text

Title: A DEP ACFT AND AN ACFT EXECUTING ASSIGNED MISSED APCH CLRNC WERE ALLOWED TO CONVERGE WHICH RESULTED IN LESS THAN STANDARD SEPARATION.

Narrative: AT APPROX XX13L, SMA X DEPARTED RWY 17L FROM ABI, ASSIGNED 150 DEG HDG BY THE TWR, ENRTE TO FORT WORTH MEACHAM ARPT. SMA Y WAS ON A VOR-A APCH TO ABI, INSTRUCTED TO CIRCLE E OF THE ARPT FOR A LEFT DOWNWIND TO RWY 17L. WHEN SMA Y REACHED THE ARPT HE DECLINED THE CIRCLE AND EXECUTED HIS INSTRUCTED MISSED APCH HDG 120 DEGS, CLBING TO 4000'. THE 2 ACFT CONTACTED APCH SIMULTANEOUSLY AND ONLY THE SMA X WAS HEARD. SMA X WAS ISSUED A HDG OF 070 DEGS CLBING TO 9000'. APPROX 55 SECS LATER SMA Y MADE INITIAL CONTACT WITH THE DEP CTLR. ON INITIAL CONTACT THE SMA Y WAS 500' AND APPROX 1 MI NW OF THE SMA X ON A CONVERGING COURSE. THE SMA X WAS INSTRUCTED TO TURN RIGHT IMMEDIATELY HDG 120 DEGS. THE SMA Y PLT THEN RPTED SMA X IN SIGHT. DURING THE SITUATION DESCRIBED ABOVE I WAS IN CONTACT WITH 8 ACFT, 7 ACFT WERE ON RADAR VECTORS, ALL POSITIONS WERE COMBINED AND 10 RADIO FREQS WERE IN USE. CAUSAL FACTORS: FREQ CONGESTION; LACK OF COORD BTWN TWR AND APCH CTLRS; AND HUMAN ERROR, IN THAT MY ATTN WAS DRAWN TO A DIFFICULT SEQUENCE AT THE ADJACENT AFB AND BECAME FOCUSED ON THAT SITUATION INSTEAD OF HAVING GOOD OVERALL SITUATIONAL AWARENESS. I BELIEVE THIS SITUATION COULD BE AVOIDED IN THE FUTURE BY DEVELOPING PROCS TO AVOID FREQ CONGESTION AND BY MORE EFFECTIVE COORD BTWN 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.