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Operational error involving less than standard separation between air carrier X and uga Y when uga Y was given descent clearance.
| Attributes | |
| ACN | 317142 |
| Time | |
| Date | 199509 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : iiu |
| State Reference | KY |
| Altitude | msl bound lower : 34000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Sabreliner 265 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 1 controller radar : 8 |
| ASRS Report | 317142 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | inflight encounter other 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 : 7800 vertical : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was a DC9/a nebound at FL330 uga Y was northbound at FL350. Uga Y reported moderate chop at FL350 and asked for flight conditions at FL280. I advised pilot FL280 was reported smooth, pilot requested FL280. I looked for traffic in front of uga Y and didn't see any so I issued descent to uga Y. I overlooked air carrier X who was traffic right underneath. When I realized my error I climbed uga Y back to FL350.
Original NASA ASRS Text
Title: OPERROR INVOLVING LTSS BTWN ACR X AND UGA Y WHEN UGA Y WAS GIVEN DSCNT CLRNC.
Narrative: ACR X WAS A DC9/A NEBOUND AT FL330 UGA Y WAS NBOUND AT FL350. UGA Y RPTED MODERATE CHOP AT FL350 AND ASKED FOR FLT CONDITIONS AT FL280. I ADVISED PLT FL280 WAS RPTED SMOOTH, PLT REQUESTED FL280. I LOOKED FOR TFC IN FRONT OF UGA Y AND DIDN'T SEE ANY SO I ISSUED DSCNT TO UGA Y. I OVERLOOKED ACR X WHO WAS TFC RIGHT UNDERNEATH. WHEN I REALIZED MY ERROR I CLBED UGA Y BACK TO FL350.
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.