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Aircraft X departed head-on into arriving aircraft Y. Reporter thought aircraft X was departing opposite direction.
| Attributes | |
| ACN | 426203 |
| Time | |
| Date | 199901 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dbq |
| State Reference | IA |
| Altitude | msl bound lower : 2000 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller radar : 8 |
| ASRS Report | 426203 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Events | |
| Anomaly | conflict : nmac non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | vertical : 300 |
| Supplementary | |
| Air Traffic Incident | Intra Facility Coordination Failure Operational Error |
Narrative:
Aircraft Y was on approach at dbq on the ILS runway 31. Aircraft X was on the ground at dbq looking for departure clearance. I thought aircraft X was departing runway 31, so I gave aircraft X the departure clearance with the restr to fly runway heading, thinking to use the 45 degree rule. Dbq tower called and told me they were opening. I advised aircraft X was departing and I had aircraft Y on approach. The tower advised aircraft X was airborne. Satisfied that aircraft X was in the air, nwbound, I terminated radar on aircraft Y and put him on advisory frequency. I then saw an uncorrelated target 300 ft above aircraft Y, sebound. Aircraft X soon called and the computer acquired the target. That was when I realized aircraft X had departed runway 13, not runway 31. I informed my supervisor of the incident and it was investigated.
Original NASA ASRS Text
Title: ACFT X DEPARTED HEAD-ON INTO ARRIVING ACFT Y. RPTR THOUGHT ACFT X WAS DEPARTING OPPOSITE DIRECTION.
Narrative: ACFT Y WAS ON APCH AT DBQ ON THE ILS RWY 31. ACFT X WAS ON THE GND AT DBQ LOOKING FOR DEP CLRNC. I THOUGHT ACFT X WAS DEPARTING RWY 31, SO I GAVE ACFT X THE DEP CLRNC WITH THE RESTR TO FLY RWY HDG, THINKING TO USE THE 45 DEG RULE. DBQ TWR CALLED AND TOLD ME THEY WERE OPENING. I ADVISED ACFT X WAS DEPARTING AND I HAD ACFT Y ON APCH. THE TWR ADVISED ACFT X WAS AIRBORNE. SATISFIED THAT ACFT X WAS IN THE AIR, NWBOUND, I TERMINATED RADAR ON ACFT Y AND PUT HIM ON ADVISORY FREQ. I THEN SAW AN UNCORRELATED TARGET 300 FT ABOVE ACFT Y, SEBOUND. ACFT X SOON CALLED AND THE COMPUTER ACQUIRED THE TARGET. THAT WAS WHEN I REALIZED ACFT X HAD DEPARTED RWY 13, NOT RWY 31. I INFORMED MY SUPVR OF THE INCIDENT AND IT WAS INVESTIGATED.
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.