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I90 controller concerned with FMS performance of fokker 900 model. Controller alleges that FMS software directs aircraft to 'turn early.'
| Attributes | |
| ACN | 520705 |
| Time | |
| Date | 200108 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : i90.tracon |
| State Reference | TX |
| Altitude | msl single value : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : i90.tracon artcc : zhu.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Falcon 900 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Experience | controller limited radar : 2 controller non radar : 7 controller radar : 10 |
| ASRS Report | 520705 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | atc equipment other atc equipment : radar other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 |
| Supplementary | |
| Problem Areas | Airport Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
F900 jet on rokit arrival to hou instructed to turn right to 300 degrees at drxlr intersection. Flight director made the turn almost 5 mi early. This resulted in a nose-to-nose situation with arrs at iah. FMS type aircraft make this turn early several times per day. This was a very close call. The situation is complicated by the fact that both aircraft in these locations are being frequency changed to final control.
Original NASA ASRS Text
Title: I90 CTLR CONCERNED WITH FMS PERFORMANCE OF FOKKER 900 MODEL. CTLR ALLEGES THAT FMS SOFTWARE DIRECTS ACFT TO 'TURN EARLY.'
Narrative: F900 JET ON ROKIT ARR TO HOU INSTRUCTED TO TURN R TO 300 DEGS AT DRXLR INTXN. FLT DIRECTOR MADE THE TURN ALMOST 5 MI EARLY. THIS RESULTED IN A NOSE-TO-NOSE SIT WITH ARRS AT IAH. FMS TYPE ACFT MAKE THIS TURN EARLY SEVERAL TIMES PER DAY. THIS WAS A VERY CLOSE CALL. THE SIT IS COMPLICATED BY THE FACT THAT BOTH ACFT IN THESE LOCATIONS ARE BEING FREQ CHANGED TO FINAL CTL.
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.