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ZMP controller perceives sufficient separation between descending DC9 and a level FA10, but is made aware of a loss of separation by conflict alert.
| Attributes | |
| ACN | 518218 |
| Time | |
| Date | 200107 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : mkg.vortac |
| State Reference | MI |
| Altitude | msl single value : 23000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | general aviation : personal |
| Make Model Name | Falcon 10C |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 10.5 |
| ASRS Report | 518218 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Resolutory Action | controller : issued new clearance flight crew : exited penetrated airspace |
| Consequence | faa : investigated |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was flying grb direct to mkg and then direct and landing grr. I accepted the handoff on air carrier X at FL270 with pilot's discretion to FL240. I accepted a handoff from ZAU on aircraft Y in level flight at FL230. I descended air carrier X to FL220 and the pilot's discretion to 11000 ft. I needed to get air carrier X underneath aircraft Y because he was landing. The conflict alert went off and I observed the airplanes and thought the air carrier X was descending at a fast enough rate to get underneath aircraft Y. I answered a line from tvc tower and 'another aircraft' (aircraft Z) and then realized I was going to lose separation. I tried to turn the air carrier X with no response and tried to call aircraft Y, but he was not on my frequency. At that time, I called my supervisor over and informed him that I was going to lose separation.
Original NASA ASRS Text
Title: ZMP CTLR PERCEIVES SUFFICIENT SEPARATION BTWN DSNDING DC9 AND A LEVEL FA10, BUT IS MADE AWARE OF A LOSS OF SEPARATION BY CONFLICT ALERT.
Narrative: ACR X WAS FLYING GRB DIRECT TO MKG AND THEN DIRECT AND LNDG GRR. I ACCEPTED THE HDOF ON ACR X AT FL270 WITH PLT'S DISCRETION TO FL240. I ACCEPTED A HDOF FROM ZAU ON ACFT Y IN LEVEL FLT AT FL230. I DSNDED ACR X TO FL220 AND THE PLT'S DISCRETION TO 11000 FT. I NEEDED TO GET ACR X UNDERNEATH ACFT Y BECAUSE HE WAS LNDG. THE CONFLICT ALERT WENT OFF AND I OBSERVED THE AIRPLANES AND THOUGHT THE ACR X WAS DSNDING AT A FAST ENOUGH RATE TO GET UNDERNEATH ACFT Y. I ANSWERED A LINE FROM TVC TWR AND 'ANOTHER ACFT' (ACFT Z) AND THEN REALIZED I WAS GOING TO LOSE SEPARATION. I TRIED TO TURN THE ACR X WITH NO RESPONSE AND TRIED TO CALL ACFT Y, BUT HE WAS NOT ON MY FREQ. AT THAT TIME, I CALLED MY SUPVR OVER AND INFORMED HIM THAT I WAS GOING TO LOSE SEPARATION.
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.