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ZID ARTCC radar controller fails to recognize inaccurate projection data resulting in a loss of separation.
| Attributes | |
| ACN | 565825 |
| Time | |
| Date | 200211 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : hvq.vor |
| State Reference | WV |
| Altitude | msl single value : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller limited radar : 2 controller non radar : 4 controller radar : 6 |
| ASRS Report | 565825 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter : weather inflight encounter other non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Supplementary | |
| Problem Areas | ATC Human Performance Weather Aircraft |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1, nebound, turning from 010 degrees to 055 degrees at FL330. After initially analyzing situation, #1 appeared to project well behind #2. After #1 established on 055 degree heading, dramatic speed increase due to strong tailwind. Winds 220 degrees at 135 KTS. Projection of vector lines lags behind 'real time' in NAS system due to averaging of aircraft historical data. This averaging is necessary to prevent 'projection' from being too erratic. However, sometimes provides inaccurate projections during turns in high wind conditions.
Original NASA ASRS Text
Title: ZID ARTCC RADAR CTLR FAILS TO RECOGNIZE INACCURATE PROJECTION DATA RESULTING IN A LOSS OF SEPARATION.
Narrative: ACFT #1, NEBOUND, TURNING FROM 010 DEGS TO 055 DEGS AT FL330. AFTER INITIALLY ANALYZING SIT, #1 APPEARED TO PROJECT WELL BEHIND #2. AFTER #1 ESTABLISHED ON 055 DEG HDG, DRAMATIC SPD INCREASE DUE TO STRONG TAILWIND. WINDS 220 DEGS AT 135 KTS. PROJECTION OF VECTOR LINES LAGS BEHIND 'REAL TIME' IN NAS SYS DUE TO AVERAGING OF ACFT HISTORICAL DATA. THIS AVERAGING IS NECESSARY TO PREVENT 'PROJECTION' FROM BEING TOO ERRATIC. HOWEVER, SOMETIMES PROVIDES INACCURATE PROJECTIONS DURING TURNS IN HIGH WIND CONDITIONS.
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.