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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier track deviation resulted from FMC database defect or programming error. Controller intervened.
| Attributes | |
| ACN | 314140 |
| Time | |
| Date | 199508 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : vwv |
| State Reference | OH |
| Altitude | msl bound lower : 18000 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob tower : sea |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute airway : zob |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 130 flight time total : 7500 flight time type : 130 |
| ASRS Report | 314140 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 13500 flight time type : 8000 |
| ASRS Report | 314139 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft was coupled to IRS navigation. Route filed and received was entered into the FMC by the PF. Apparently a waypoint was passed by the FMC. Instead of going outbound on the vwv 115 degree radial, the aircraft proceeded direct wakem. Cle ARTCC asked if we had been cleared via the wakem 2 arrival and we had. We received a short vector, then were cleared direct to wakem. Crew had correctly entered the flight plan into the computer, however, it appears route wasn't verified prior to starting descent, or for some reason the computer dumped a waypoint. Company policy does not require raw data monitoring of route. On short flight segments in busy environments it's difficult for PNF to xchk every computer input. Crew coordination and communication was generally good between both pilots of crew. Supplemental information from acn 314139: I selected the arrival from the database in the FMC, along with the transition. The aircraft bypassed elija intersection went vwv direct wakem. The error could have been in the database, or FMC, or in cleaning up route discontinuities or was a result of executing as a waypoint was passed or a misunderstood clearance. (Crew rest) we had a XX00 am wake- up XA00 am van, XB00 am departure.
Original NASA ASRS Text
Title: ACR TRACK DEV RESULTED FROM FMC DATABASE DEFECT OR PROGRAMMING ERROR. CTLR INTERVENED.
Narrative: ACFT WAS COUPLED TO IRS NAV. RTE FILED AND RECEIVED WAS ENTERED INTO THE FMC BY THE PF. APPARENTLY A WAYPOINT WAS PASSED BY THE FMC. INSTEAD OF GOING OUTBOUND ON THE VWV 115 DEG RADIAL, THE ACFT PROCEEDED DIRECT WAKEM. CLE ARTCC ASKED IF WE HAD BEEN CLRED VIA THE WAKEM 2 ARR AND WE HAD. WE RECEIVED A SHORT VECTOR, THEN WERE CLRED DIRECT TO WAKEM. CREW HAD CORRECTLY ENTERED THE FLT PLAN INTO THE COMPUTER, HOWEVER, IT APPEARS RTE WASN'T VERIFIED PRIOR TO STARTING DSCNT, OR FOR SOME REASON THE COMPUTER DUMPED A WAYPOINT. COMPANY POLICY DOES NOT REQUIRE RAW DATA MONITORING OF RTE. ON SHORT FLT SEGMENTS IN BUSY ENVIRONMENTS IT'S DIFFICULT FOR PNF TO XCHK EVERY COMPUTER INPUT. CREW COORD AND COM WAS GENERALLY GOOD BTWN BOTH PLTS OF CREW. SUPPLEMENTAL INFO FROM ACN 314139: I SELECTED THE ARR FROM THE DATABASE IN THE FMC, ALONG WITH THE TRANSITION. THE ACFT BYPASSED ELIJA INTXN WENT VWV DIRECT WAKEM. THE ERROR COULD HAVE BEEN IN THE DATABASE, OR FMC, OR IN CLEANING UP RTE DISCONTINUITIES OR WAS A RESULT OF EXECUTING AS A WAYPOINT WAS PASSED OR A MISUNDERSTOOD CLRNC. (CREW REST) WE HAD A XX00 AM WAKE- UP XA00 AM VAN, XB00 AM DEP.
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.