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Aircraft #1 in ZMP airspace IFR descending when controller spots unknown VFR aircraft #2 climbing on converging course. Aircraft #1 required to take evasive action.
| Attributes | |
| ACN | 402546 |
| Time | |
| Date | 199805 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : rwf |
| State Reference | MN |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp |
| Operator | common carrier : air taxi |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Cessna 310/T310C |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 402546 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 200 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
TCASII aircraft had clearance to 9000 ft when he was out of approximately 11500 ft merging traffic climbing out of 9300 ft VFR. I was not talking to 2ND aircraft. I called traffic and stopped descent to 11000 ft. When aircraft was out of 10100 ft called requesting IFR clearance. Again I called traffic and he said he had the visual. He kept climbing. I told him to maintain VFR. The TCASII aircraft reported the traffic on TCASII but not the visual. Then he reported traffic in sight and that they had an RA and was going to climb.
Original NASA ASRS Text
Title: ACFT #1 IN ZMP AIRSPACE IFR DSNDING WHEN CTLR SPOTS UNKNOWN VFR ACFT #2 CLBING ON CONVERGING COURSE. ACFT #1 REQUIRED TO TAKE EVASIVE ACTION.
Narrative: TCASII ACFT HAD CLRNC TO 9000 FT WHEN HE WAS OUT OF APPROX 11500 FT MERGING TFC CLBING OUT OF 9300 FT VFR. I WAS NOT TALKING TO 2ND ACFT. I CALLED TFC AND STOPPED DSCNT TO 11000 FT. WHEN ACFT WAS OUT OF 10100 FT CALLED REQUESTING IFR CLRNC. AGAIN I CALLED TFC AND HE SAID HE HAD THE VISUAL. HE KEPT CLBING. I TOLD HIM TO MAINTAIN VFR. THE TCASII ACFT RPTED THE TFC ON TCASII BUT NOT THE VISUAL. THEN HE RPTED TFC IN SIGHT AND THAT THEY HAD AN RA AND WAS GOING TO CLB.
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.