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Too many aircraft at the same altitude and 1 was wrong altitude for direction of flight. Poor coordination and aircraft on separate ATC frequencys caused a system error.
| Attributes | |
| ACN | 184950 |
| Time | |
| Date | 199107 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ekn |
| State Reference | WV |
| Altitude | msl bound lower : 31500 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 5 |
| ASRS Report | 184950 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 1500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure Operational Error |
Narrative:
Large transport X nwbound at FL330 wafdof to ZID. Small transport Y northbound at FL330 under large transport X. ZID attempted to pointout an small transport Z nebound at FL330. I took small transport Z in radar contact to make sure I avoided small transport Y. Large transport X was switched to ZID crw high. Crw high was working (talking) to small transport Z at FL330 and I wanted to make sure ZID had both aircraft. Crw high transferred communications to me on small transport Y then crw high. Later called and said they were not talking to large transport X and I could turn and descend small transport Y in their airspace. Small transport Y target was swapping with an aircraft below him at FL280 and I could not determine an appropriate turn. I descended small transport Y to FL310 in a min or less. Small transport Y reported level FL310 16 seconds after separation was lost.
Original NASA ASRS Text
Title: TOO MANY ACFT AT THE SAME ALT AND 1 WAS WRONG ALT FOR DIRECTION OF FLT. POOR COORD AND ACFT ON SEPARATE ATC FREQS CAUSED A SYS ERROR.
Narrative: LGT X NWBOUND AT FL330 WAFDOF TO ZID. SMT Y NBOUND AT FL330 UNDER LGT X. ZID ATTEMPTED TO POINTOUT AN SMT Z NEBOUND AT FL330. I TOOK SMT Z IN RADAR CONTACT TO MAKE SURE I AVOIDED SMT Y. LGT X WAS SWITCHED TO ZID CRW HIGH. CRW HIGH WAS WORKING (TALKING) TO SMT Z AT FL330 AND I WANTED TO MAKE SURE ZID HAD BOTH ACFT. CRW HIGH TRANSFERRED COMS TO ME ON SMT Y THEN CRW HIGH. LATER CALLED AND SAID THEY WERE NOT TALKING TO LGT X AND I COULD TURN AND DSND SMT Y IN THEIR AIRSPACE. SMT Y TARGET WAS SWAPPING WITH AN ACFT BELOW HIM AT FL280 AND I COULD NOT DETERMINE AN APPROPRIATE TURN. I DSNDED SMT Y TO FL310 IN A MIN OR LESS. SMT Y RPTED LEVEL FL310 16 SECONDS AFTER SEPARATION WAS 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.