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A challenger 600 flight crew began a turn prior to the fix near hou. ARTCC radar controller is concerned that the early turn could result in a traffic conflict.
| Attributes | |
| ACN | 457802 |
| Time | |
| Date | 199912 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | TX |
| Altitude | msl single value : 6000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : i90.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Challenger CL600 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | arrival star : sslam |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 457802 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Aircraft |
Narrative:
At approximately XA20 I observed aircraft X, a CL60, miss an assigned turn (heading 300 degrees at drxlr). He did not turn late, but about 5 mi prior to drxlr, unattended, this would have put him in converging conflict with iah arrival traffic. This aircraft had been cleared to hou via the sslam arrival. The heading assigned is standard for traffic entering downwind for runway 12R. I observed the abnormality and brought it to the attention of the receiving controller and the supervisor. When queried, the pilot stated that flight director turned him early based on his speed (210 KTS assigned). If that is in fact the case, then the parameters of this aircraft's flight director are perilously out of tolerance. Again, without immediate intervention, this flight director put the people on aircraft X in harms way.
Original NASA ASRS Text
Title: A CHALLENGER 600 FLC BEGAN A TURN PRIOR TO THE FIX NEAR HOU. ARTCC RADAR CTLR IS CONCERNED THAT THE EARLY TURN COULD RESULT IN A TFC CONFLICT.
Narrative: AT APPROX XA20 I OBSERVED ACFT X, A CL60, MISS AN ASSIGNED TURN (HDG 300 DEGS AT DRXLR). HE DID NOT TURN LATE, BUT ABOUT 5 MI PRIOR TO DRXLR, UNATTENDED, THIS WOULD HAVE PUT HIM IN CONVERGING CONFLICT WITH IAH ARR TFC. THIS ACFT HAD BEEN CLRED TO HOU VIA THE SSLAM ARR. THE HDG ASSIGNED IS STANDARD FOR TFC ENTERING DOWNWIND FOR RWY 12R. I OBSERVED THE ABNORMALITY AND BROUGHT IT TO THE ATTN OF THE RECEIVING CTLR AND THE SUPVR. WHEN QUERIED, THE PLT STATED THAT FLT DIRECTOR TURNED HIM EARLY BASED ON HIS SPD (210 KTS ASSIGNED). IF THAT IS IN FACT THE CASE, THEN THE PARAMETERS OF THIS ACFT'S FLT DIRECTOR ARE PERILOUSLY OUT OF TOLERANCE. AGAIN, WITHOUT IMMEDIATE INTERVENTION, THIS FLT DIRECTOR PUT THE PEOPLE ON ACFT X IN HARMS WAY.
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.