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Busy ARTCC radar controller did not see potential conflict less than standard separation occurring until too late to prevent loss of separation. Controller turned air carrier X to miss air carrier Y and air carrier Y was already responding to a TCASII RA. Manual controller was distracted with other duties and was not aware of system error till alerted on interphone line.
| Attributes | |
| ACN | 321308 |
| Time | |
| Date | 199511 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : dnv |
| State Reference | IL |
| Altitude | msl bound lower : 32700 msl bound upper : 33900 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 10 |
| ASRS Report | 321308 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : non radar |
| Qualification | controller : radar |
| Experience | controller radar : 5 |
| ASRS Report | 321122 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 17400 vertical : 1200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
With a high volume of traffic I mistakenly assumed air carrier X would be level at FL350 after departing cvg. He was in conflict with an air carrier Y flight at FL330 which departed mke and was heading sbound. After recognizing the conflict I turned the air carrier X to miss the air carrier Y and the air carrier Y flight responded to a TCASII alert and descended. Supplemental information from acn 321122: I was sequencing strips and putting rertes in the machine. The conflict at XA30 was brought to my attention over the landlines. Confliction between air carrier X and air carrier Y on nov/wed/95.
Original NASA ASRS Text
Title: BUSY ARTCC RADAR CTLR DID NOT SEE POTENTIAL CONFLICT LTSS OCCURRING UNTIL TOO LATE TO PREVENT LOSS OF SEPARATION. CTLR TURNED ACR X TO MISS ACR Y AND ACR Y WAS ALREADY RESPONDING TO A TCASII RA. MANUAL CTLR WAS DISTRACTED WITH OTHER DUTIES AND WAS NOT AWARE OF SYS ERROR TILL ALERTED ON INTERPHONE LINE.
Narrative: WITH A HIGH VOLUME OF TFC I MISTAKENLY ASSUMED ACR X WOULD BE LEVEL AT FL350 AFTER DEPARTING CVG. HE WAS IN CONFLICT WITH AN ACR Y FLT AT FL330 WHICH DEPARTED MKE AND WAS HEADING SBOUND. AFTER RECOGNIZING THE CONFLICT I TURNED THE ACR X TO MISS THE ACR Y AND THE ACR Y FLT RESPONDED TO A TCASII ALERT AND DSNDED. SUPPLEMENTAL INFO FROM ACN 321122: I WAS SEQUENCING STRIPS AND PUTTING RERTES IN THE MACHINE. THE CONFLICT AT XA30 WAS BROUGHT TO MY ATTN OVER THE LANDLINES. CONFLICTION BTWN ACR X AND ACR Y ON NOV/WED/95.
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.