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Controller observes traffic on radar that is in conflict with an air carrier arrival at the same altitude. The beacon target turned out to be a ghost target of the air carrier aircraft. Facility has ASR-9 radar.
| Attributes | |
| ACN | 261331 |
| Time | |
| Date | 199401 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : dxo airport : dtw |
| State Reference | MI |
| Altitude | msl bound lower : 11000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival other enroute airway : dtw |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 4 controller radar : 13 |
| ASRS Report | 261331 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | other |
| Situations | |
| Navigational Aid | Unspecified |
Narrative:
Air carrier X inbound to dtw on polar arrival. When air carrier X was 1 mi from traml another controller advised me that air carrier X had traffic at 2 O'clock at 12000 also. I issued traffic to air carrier X and descended him immediately to 10000. The target coasted for 2 sweeps. While in coast, I descended air carrier X to 6000. The beacon of the intruder re-acquired and now showed 11000, the same altitude that air carrier X was leaving! I advised air carrier X that the traffic now 2 mi away appeared to be descending. They merged, the traffic disappeared. We brought up the beacon of the intruder, it turned out to be a ghost of air carrier X! We have ASR-9.
Original NASA ASRS Text
Title: CTLR OBSERVES TFC ON RADAR THAT IS IN CONFLICT WITH AN ACR ARR AT THE SAME ALT. THE BEACON TARGET TURNED OUT TO BE A GHOST TARGET OF THE ACR ACFT. FACILITY HAS ASR-9 RADAR.
Narrative: ACR X INBOUND TO DTW ON POLAR ARR. WHEN ACR X WAS 1 MI FROM TRAML ANOTHER CTLR ADVISED ME THAT ACR X HAD TFC AT 2 O'CLOCK AT 12000 ALSO. I ISSUED TFC TO ACR X AND DSNDED HIM IMMEDIATELY TO 10000. THE TARGET COASTED FOR 2 SWEEPS. WHILE IN COAST, I DSNDED ACR X TO 6000. THE BEACON OF THE INTRUDER RE-ACQUIRED AND NOW SHOWED 11000, THE SAME ALT THAT ACR X WAS LEAVING! I ADVISED ACR X THAT THE TFC NOW 2 MI AWAY APPEARED TO BE DSNDING. THEY MERGED, THE TFC DISAPPEARED. WE BROUGHT UP THE BEACON OF THE INTRUDER, IT TURNED OUT TO BE A GHOST OF ACR X! WE HAVE ASR-9.
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.