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ZMP controller described near loss of separation when controller working adjacent sector failed to ensure separation before handoff was initiated.
| Attributes | |
| ACN | 702421 |
| Time | |
| Date | 200607 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : grb.vortac |
| State Reference | WI |
| Altitude | msl single value : 28000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller military : 4 controller non radar : 18 controller radar : 22 |
| ASRS Report | 702421 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued advisory controller : issued alert controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 23000 vertical : 1000 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
I was working the tvc low sector FL230 and below. I received a radar handoff from the tvc high sector on air carrier X. Shortly thereafter; air carrier X (A310) checked on level at FL280 with pilot's discretionary descent to FL240. I issued air carrier X a discretionary descent to 11000 ft. Shortly after air carrier X started descending; he reported he was responding to an RA; and asked if I knew who the traffic was at FL270. Nearly simultaneously the conflict alert activated and I saw air carrier Y flashing. I informed air carrier X that traffic was a B737. Air carrier X reported out of FL280 and would be leveling off at FL286. Standard separation was never lost. The controller working tvc should have resolved this conflict before making a radar handoff.
Original NASA ASRS Text
Title: ZMP CTLR DESCRIBED NEAR LOSS OF SEPARATION WHEN CTLR WORKING ADJACENT SECTOR FAILED TO ENSURE SEPARATION BEFORE HDOF WAS INITIATED.
Narrative: I WAS WORKING THE TVC LOW SECTOR FL230 AND BELOW. I RECEIVED A RADAR HDOF FROM THE TVC HIGH SECTOR ON ACR X. SHORTLY THEREAFTER; ACR X (A310) CHKED ON LEVEL AT FL280 WITH PLT'S DISCRETIONARY DSCNT TO FL240. I ISSUED ACR X A DISCRETIONARY DSCNT TO 11000 FT. SHORTLY AFTER ACR X STARTED DSNDING; HE RPTED HE WAS RESPONDING TO AN RA; AND ASKED IF I KNEW WHO THE TFC WAS AT FL270. NEARLY SIMULTANEOUSLY THE CONFLICT ALERT ACTIVATED AND I SAW ACR Y FLASHING. I INFORMED ACR X THAT TFC WAS A B737. ACR X RPTED OUT OF FL280 AND WOULD BE LEVELING OFF AT FL286. STANDARD SEPARATION WAS NEVER LOST. THE CTLR WORKING TVC SHOULD HAVE RESOLVED THIS CONFLICT BEFORE MAKING A RADAR HDOF.
Data retrieved from NASA's ASRS site as of January 2009 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.