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Flight crew of a B737-300 was observed 12 mi off course between 2 vortacs. Crew blames error on the aircraft's FMS since they believed that they had programmed it with the proper route.
| Attributes | |
| ACN | 431473 |
| Time | |
| Date | 199903 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : bff.vortac |
| State Reference | NE |
| Altitude | msl single value : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j94.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 13000 flight time type : 1000 |
| ASRS Report | 431473 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 7000 flight time type : 900 |
| ASRS Report | 431970 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance non adherence : far other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued alert none taken : detected after the fact |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
FMS flight plan was ocs J94 onl. Aircraft flew direct between ocs-onl and was observed by ZDV to be 12 NM north of J94.
Original NASA ASRS Text
Title: FLC OF A B737-300 WAS OBSERVED 12 MI OFF COURSE BTWN 2 VORTACS. CREW BLAMES ERROR ON THE ACFT'S FMS SINCE THEY BELIEVED THAT THEY HAD PROGRAMMED IT WITH THE PROPER RTE.
Narrative: FMS FLT PLAN WAS OCS J94 ONL. ACFT FLEW DIRECT BTWN OCS-ONL AND WAS OBSERVED BY ZDV TO BE 12 NM N OF J94.
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.