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Controller forgot to change altitude onacft after it turned, had two aircraft same altitude with less than standard separation.
| Attributes | |
| ACN | 173047 |
| Time | |
| Date | 199103 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : hvq |
| State Reference | WV |
| Altitude | msl bound lower : 9000 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, Low Wing, 1 Eng, Retractable Gear |
| Flight Phase | cruise other |
| Route In Use | enroute airway : crw |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 6 |
| ASRS Report | 173047 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Southbound small aircraft X was 9000 altitude, right for direction. Northbound small transport Y was 9000 (right for direction initially but should've changed to even altitude after slight course change over bkw VOR). I missed changing small transport Y altitude when course changed to 359 degree, then I allowed myself to be distraction by a VFR overflt changing his flight plan and who I had handoff problems with. By the time I looked back at the small aircraft X and small transport Y they were head on, both at 9000 4 mi apart and each had to be given a 90 degree left turn to miss. Correction: don't let distrs draw away from continued scanning.
Original NASA ASRS Text
Title: CTLR FORGOT TO CHANGE ALT ONACFT AFTER IT TURNED, HAD TWO ACFT SAME ALT WITH LESS THAN STANDARD SEPARATION.
Narrative: SBND SMA X WAS 9000 ALT, R FOR DIRECTION. NBND SMT Y WAS 9000 (R FOR DIRECTION INITIALLY BUT SHOULD'VE CHANGED TO EVEN ALT AFTER SLIGHT COURSE CHANGE OVER BKW VOR). I MISSED CHANGING SMT Y ALT WHEN COURSE CHANGED TO 359 DEG, THEN I ALLOWED MYSELF TO BE DISTR BY A VFR OVERFLT CHANGING HIS FLT PLAN AND WHO I HAD HDOF PROBS WITH. BY THE TIME I LOOKED BACK AT THE SMA X AND SMT Y THEY WERE HEAD ON, BOTH AT 9000 4 MI APART AND EACH HAD TO BE GIVEN A 90 DEG L TURN TO MISS. CORRECTION: DON'T LET DISTRS DRAW AWAY FROM CONTINUED SCANNING.
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.