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ZID controller issues vector headings for 2 aircraft on parallel, same altitude courses, but actions are not sufficient to maintain lateral separation.
| Attributes | |
| ACN | 450974 |
| Time | |
| Date | 199910 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : hnn.vortac |
| State Reference | WV |
| Altitude | msl single value : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Citation II S2/Bravo |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller radar : 6 |
| ASRS Report | 450974 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27600 vertical : 200 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Both aircraft assigned headings. Action appeared to provide separation. Moments later, aircraft looked to be a factor again. Additional turns issued, radar data on citation Y began fluctuation. Radar target was double bright and not steady. Aircraft turned again. Aedp actuated at 4.6 NM.
Original NASA ASRS Text
Title: ZID CTLR ISSUES VECTOR HDGS FOR 2 ACFT ON PARALLEL, SAME ALT COURSES, BUT ACTIONS ARE NOT SUFFICIENT TO MAINTAIN LATERAL SEPARATION.
Narrative: BOTH ACFT ASSIGNED HDGS. ACTION APPEARED TO PROVIDE SEPARATION. MOMENTS LATER, ACFT LOOKED TO BE A FACTOR AGAIN. ADDITIONAL TURNS ISSUED, RADAR DATA ON CITATION Y BEGAN FLUCTUATION. RADAR TARGET WAS DOUBLE BRIGHT AND NOT STEADY. ACFT TURNED AGAIN. AEDP ACTUATED AT 4.6 NM.
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.