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Aircraft X same altitude assigned opposite direction traffic had less than standard separation with aircraft Y. System error.
| Attributes | |
| ACN | 257384 |
| Time | |
| Date | 199311 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : pnm |
| State Reference | MN |
| Altitude | msl bound lower : 8000 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other ground : parked |
| Route In Use | enroute : direct enroute airway : zmp |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 8 |
| ASRS Report | 257384 |
| Person 2 | |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe conflict : nmac non adherence : required legal separation non adherence : published procedure other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 0 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Sector is normally radar to 4000 but radar was OTS so the sector was non-radar below 8000. All sectors in the area were combined at 1 sector, so the sector was being worked on a 250 mi scale. 15 aircraft were in the sectors. Aircraft X on airway headed sebound at 7000 requests block 7000 through 8000. Aircraft Y on same airway nwbound originally requesting 12000, stopped at 8000. I got busy with other aircraft and never realized head-on situation. Aircraft Y reported an aircraft passing under him. The sector should not have been combined with the radar OTS. I also should have gotten a d-side to help me.
Original NASA ASRS Text
Title: ACFT X SAME ALT ASSIGNED OPPOSITE DIRECTION TFC HAD LTSS WITH ACFT Y. SYS ERROR.
Narrative: SECTOR IS NORMALLY RADAR TO 4000 BUT RADAR WAS OTS SO THE SECTOR WAS NON-RADAR BELOW 8000. ALL SECTORS IN THE AREA WERE COMBINED AT 1 SECTOR, SO THE SECTOR WAS BEING WORKED ON A 250 MI SCALE. 15 ACFT WERE IN THE SECTORS. ACFT X ON AIRWAY HEADED SEBOUND AT 7000 REQUESTS BLOCK 7000 THROUGH 8000. ACFT Y ON SAME AIRWAY NWBOUND ORIGINALLY REQUESTING 12000, STOPPED AT 8000. I GOT BUSY WITH OTHER ACFT AND NEVER REALIZED HEAD-ON SIT. ACFT Y RPTED AN ACFT PASSING UNDER HIM. THE SECTOR SHOULD NOT HAVE BEEN COMBINED WITH THE RADAR OTS. I ALSO SHOULD HAVE GOTTEN A D-SIDE TO HELP ME.
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.