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Less than standard separation when controller lost track of small aircraft and vectored another aircraft into close proximity.
| Attributes | |
| ACN | 96541 |
| Time | |
| Date | 198810 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : msn |
| State Reference | WI |
| Altitude | msl bound lower : 6700 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : msn tower : efd |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, Low Wing, 2 Eng, Retractable Gear |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : private |
| Experience | flight time last 90 days : 40 flight time total : 1000 flight time type : 20 |
| ASRS Report | 96541 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | unspecified : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
On top of 7000' unlimited visibility, transponder reported only intermittent signal. Believe approach control lost radar contact and vectored another aircraft into collision course. However, after incident asked controller if he had radar contact and he replied affirmative.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION WHEN CTLR LOST TRACK OF SMA AND VECTORED ANOTHER ACFT INTO CLOSE PROX.
Narrative: ON TOP OF 7000' UNLIMITED VISIBILITY, TRANSPONDER RPTED ONLY INTERMITTENT SIGNAL. BELIEVE APCH CTL LOST RADAR CONTACT AND VECTORED ANOTHER ACFT INTO COLLISION COURSE. HOWEVER, AFTER INCIDENT ASKED CTLR IF HE HAD RADAR CONTACT AND HE REPLIED AFFIRMATIVE.
Data retrieved from NASA's ASRS site as of August 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.