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Less than standard separation between air carrier medium large transport descending and an air carrier light transport climbing. Controller missed the limited data block information on the medium large transport.
| Attributes | |
| ACN | 210170 |
| Time | |
| Date | 199205 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : grb |
| State Reference | WI |
| Altitude | msl bound lower : 12000 msl bound upper : 12400 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute airway : zmp |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, High Wing, 2 Turboprop Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 2 controller radar : 9 |
| ASRS Report | 210170 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 26400 vertical : 400 |
Narrative:
At XA29 I combined 2 sectors in ZMP (sectors 3,4). All data blocks were manually transferred except for medium large transport X msp J106 grb descending to 9000. Light transport Y was grb aww cwa climbing to 12000. The limited data block of medium large transport X was not observed and separation was lost. The conflict alert did not activate until separation was already lost. To prevent recurrence: develop software in NAS stage a so that when sectors are combined: data blocks with track control transfer automatically to the new position. Data blocks without track control are displayed on combined scope by one pvd function (automatically). Improve conflict alert so it activates prior to a systems error happening.
Original NASA ASRS Text
Title: LTSS BTWN ACR MLG DSNDING AND AN ACR LTT CLBING. CTLR MISSED THE LIMITED DATA BLOCK INFO ON THE MLG.
Narrative: AT XA29 I COMBINED 2 SECTORS IN ZMP (SECTORS 3,4). ALL DATA BLOCKS WERE MANUALLY TRANSFERRED EXCEPT FOR MLG X MSP J106 GRB DSNDING TO 9000. LTT Y WAS GRB AWW CWA CLBING TO 12000. THE LIMITED DATA BLOCK OF MLG X WAS NOT OBSERVED AND SEPARATION WAS LOST. THE CONFLICT ALERT DID NOT ACTIVATE UNTIL SEPARATION WAS ALREADY LOST. TO PREVENT RECURRENCE: DEVELOP SOFTWARE IN NAS STAGE A SO THAT WHEN SECTORS ARE COMBINED: DATA BLOCKS WITH TRACK CTL TRANSFER AUTOMATICALLY TO THE NEW POS. DATA BLOCKS WITHOUT TRACK CTL ARE DISPLAYED ON COMBINED SCOPE BY ONE PVD FUNCTION (AUTOMATICALLY). IMPROVE CONFLICT ALERT SO IT ACTIVATES PRIOR TO A SYSTEMS ERROR HAPPENING.
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.