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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Operational error. Less than standard separation between converging B757 and MD80 at the same altitude.
| Attributes | |
| ACN | 336098 |
| Time | |
| Date | 199605 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : gup |
| State Reference | NM |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zab |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 14 |
| ASRS Report | 336098 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 26400 vertical : 1500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X and air carrier Y were converging at FL310. I issued a 25 degree turn for air carrier Y. It wasn't enough and I issued an additional 20 degree to air carrier Y. I then instructed air carrier X to maintain present heading. Following this I descended air carrier Y immediately to FL290. Eventually I turned air carrier X 20 degrees right immediately. Separation was lost at 4.4 mi and 1500 ft.
Original NASA ASRS Text
Title: OPERROR. LTSS BTWN CONVERGING B757 AND MD80 AT THE SAME ALT.
Narrative: ACR X AND ACR Y WERE CONVERGING AT FL310. I ISSUED A 25 DEG TURN FOR ACR Y. IT WASN'T ENOUGH AND I ISSUED AN ADDITIONAL 20 DEG TO ACR Y. I THEN INSTRUCTED ACR X TO MAINTAIN PRESENT HDG. FOLLOWING THIS I DSNDED ACR Y IMMEDIATELY TO FL290. EVENTUALLY I TURNED ACR X 20 DEGS R IMMEDIATELY. SEPARATION WAS LOST AT 4.4 MI AND 1500 FT.
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.