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Controller a descended aircraft X to same altitude as atx Y and near midair collision occurred. System error.
| Attributes | |
| ACN | 117650 |
| Time | |
| Date | 198907 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : ccc |
| State Reference | NY |
| Altitude | msl bound lower : 4000 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, Low Wing, 1 Eng, Fixed Gear |
| Flight Phase | descent other |
| Route In Use | enroute : direct enroute airway : n90 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air taxi |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller non radar : 2 controller radar : 4 |
| ASRS Report | 117650 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : nmac non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 0 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Intra Facility Coordination Failure |
Narrative:
Aircraft X, an small aircraft, was on CCC 057 right at 5000' without mode C. Atx Y, an light transport, was on CCC 057 right at 4000 gaining on slower small aircraft. Aircraft X was told to descend and maintain 4000 and report reaching by controller a. After being told to descend, controller a relieved controller B and position briefing was incomplete. Atx Y was turned, but not enough. Controller B thought aircraft X was still at 5000', due to wrong altitude in data block. Entry by controller a showing 5000. FAA is investigating the incident.
Original NASA ASRS Text
Title: CTLR A DESCENDED ACFT X TO SAME ALT AS ATX Y AND NMAC OCCURRED. SYSTEM ERROR.
Narrative: ACFT X, AN SMA, WAS ON CCC 057 R AT 5000' WITHOUT MODE C. ATX Y, AN LTT, WAS ON CCC 057 R AT 4000 GAINING ON SLOWER SMA. ACFT X WAS TOLD TO DSND AND MAINTAIN 4000 AND REPORT REACHING BY CTLR A. AFTER BEING TOLD TO DSND, CTLR A RELIEVED CTLR B AND POSITION BRIEFING WAS INCOMPLETE. ATX Y WAS TURNED, BUT NOT ENOUGH. CTLR B THOUGHT ACFT X WAS STILL AT 5000', DUE TO WRONG ALT IN DATA BLOCK. ENTRY BY CTLR A SHOWING 5000. FAA IS INVESTIGATING THE INCIDENT.
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.