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Reporter assumed that aircraft X and Y would pass each other with legal separation. Reporter realizing that separation was inadequate, tried to recover, but not soon enough, resulted in operational error.
| Attributes | |
| ACN | 426787 |
| Time | |
| Date | 199901 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : vhp |
| State Reference | IN |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller non radar : 8 controller radar : 5 |
| ASRS Report | 426787 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | Other |
| Miss Distance | horizontal : 26400 vertical : 100 |
| Supplementary | |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 (aircraft X) was swbound on FL350, aircraft #2 (aircraft Y) was nwbound at FL350. I assumed that there would be at least 5 mi between them and upon realizing that there would be less, I descended aircraft Y but separation was already lost.
Original NASA ASRS Text
Title: RPTR ASSUMED THAT ACFT X AND Y WOULD PASS EACH OTHER WITH LEGAL SEPARATION. RPTR REALIZING THAT SEPARATION WAS INADEQUATE, TRIED TO RECOVER, BUT NOT SOON ENOUGH, RESULTED IN OPERROR.
Narrative: ACFT #1 (ACFT X) WAS SWBOUND ON FL350, ACFT #2 (ACFT Y) WAS NWBOUND AT FL350. I ASSUMED THAT THERE WOULD BE AT LEAST 5 MI BTWN THEM AND UPON REALIZING THAT THERE WOULD BE LESS, I DSNDED ACFT Y BUT SEPARATION WAS ALREADY LOST.
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.