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Approach controller had less than standard separation between an mlt in holding pattern and an mlt on missed approach. Second mlt was on wrong frequency.
| Attributes | |
| ACN | 97947 |
| Time | |
| Date | 198811 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : crp |
| State Reference | TX |
| Altitude | msl bound lower : 3000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : crp |
| Operator | other |
| Make Model Name | Military Transport |
| Flight Phase | other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Helicopter |
| Flight Phase | landing : missed approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 97947 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : nmac non adherence : required legal separation non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 450 vertical : 100 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
While working the approach control position with moderate aircraft, I had a navy mlt X holding southeast of the VORTAC at 3000'. The VORTAC is located 7.2 NM northeast of the airport. After taking a handoff on a coast guard mlt Y on the ILS approach I was continuing to work another mlt north of the airport for a visual approach to runway 17. The coast guard aircraft's missed approach instructions were heading 030 degrees, climb to 3000' and return to my frequency. The coast guard aircraft missed approach and contacted the south controller on the wrong frequency. The south controller then switched the mlt Y to my frequency. The aircraft failed to make initial contact with me. At that point I was clearing the mlt Z north of the airport for a visual approach. He acknowledged the clearance. After he made his last transmission, I started scanning the scope to see the mlt X holding at the VORTAC and the mlt Y northeast bound on converging courses. The mlt X was turning wbound to nwbound with the mlt Y still heading 030 degrees. Issued traffic to the mlt Y, 11 O'clock, 1 mi and he replied he was IMC. He then came back and said he saw the mlt X behind him. After approximately 30 seconds the mlt X said he had to return to navy corpus to file a near miss with the mlt Y. I feel that frequency congestion, workload and the fact the aircraft (mlt Y) never made initial contact with me were the contributing factors in the incident.
Original NASA ASRS Text
Title: APCH CTLR HAD LESS THAN STANDARD SEPARATION BETWEEN AN MLT IN HOLDING PATTERN AND AN MLT ON MISSED APCH. SECOND MLT WAS ON WRONG FREQ.
Narrative: WHILE WORKING THE APCH CTL POS WITH MODERATE ACFT, I HAD A NAVY MLT X HOLDING SE OF THE VORTAC AT 3000'. THE VORTAC IS LOCATED 7.2 NM NE OF THE ARPT. AFTER TAKING A HDOF ON A COAST GUARD MLT Y ON THE ILS APCH I WAS CONTINUING TO WORK ANOTHER MLT N OF THE ARPT FOR A VISUAL APCH TO RWY 17. THE COAST GUARD ACFT'S MISSED APCH INSTRUCTIONS WERE HDG 030 DEGS, CLB TO 3000' AND RETURN TO MY FREQ. THE COAST GUARD ACFT MISSED APCH AND CONTACTED THE S CTLR ON THE WRONG FREQ. THE S CTLR THEN SWITCHED THE MLT Y TO MY FREQ. THE ACFT FAILED TO MAKE INITIAL CONTACT WITH ME. AT THAT POINT I WAS CLRING THE MLT Z N OF THE ARPT FOR A VISUAL APCH. HE ACKNOWLEDGED THE CLRNC. AFTER HE MADE HIS LAST XMISSION, I STARTED SCANNING THE SCOPE TO SEE THE MLT X HOLDING AT THE VORTAC AND THE MLT Y NE BOUND ON CONVERGING COURSES. THE MLT X WAS TURNING WBOUND TO NWBOUND WITH THE MLT Y STILL HDG 030 DEGS. ISSUED TFC TO THE MLT Y, 11 O'CLOCK, 1 MI AND HE REPLIED HE WAS IMC. HE THEN CAME BACK AND SAID HE SAW THE MLT X BEHIND HIM. AFTER APPROX 30 SECS THE MLT X SAID HE HAD TO RETURN TO NAVY CORPUS TO FILE A NEAR MISS WITH THE MLT Y. I FEEL THAT FREQ CONGESTION, WORKLOAD AND THE FACT THE ACFT (MLT Y) NEVER MADE INITIAL CONTACT WITH ME WERE THE CONTRIBUTING FACTORS IN THE INCIDENT.
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.