Narrative:

Programming error occurred on the flight plan portion of FMC. In programming the routing; the J104 portion of flight plan was dropped. This was discovered by ATC when we were reported west of course. We later discovered that although J104 was indeed entered; it never got executed on the route page. As a result; the SID transition became linked to the STAR transition; ie; gbn to tnp. The route page was crosschecked against release and clearance; however; the legs page was not. This may have eliminated the error. A verification of the legs page may have prevented this.

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Original NASA ASRS Text

Title: B737-300 FLT CREW IMPROPERLY ENTERED ROUTE INTO FMS RESULTING IN A NAV DEVIATION.

Narrative: PROGRAMMING ERROR OCCURRED ON THE FLT PLAN PORTION OF FMC. IN PROGRAMMING THE ROUTING; THE J104 PORTION OF FLT PLAN WAS DROPPED. THIS WAS DISCOVERED BY ATC WHEN WE WERE RPTED W OF COURSE. WE LATER DISCOVERED THAT ALTHOUGH J104 WAS INDEED ENTERED; IT NEVER GOT EXECUTED ON THE RTE PAGE. AS A RESULT; THE SID TRANSITION BECAME LINKED TO THE STAR TRANSITION; IE; GBN TO TNP. THE RTE PAGE WAS XCHKED AGAINST RELEASE AND CLRNC; HOWEVER; THE LEGS PAGE WAS NOT. THIS MAY HAVE ELIMINATED THE ERROR. A VERIFICATION OF THE LEGS PAGE MAY HAVE PREVENTED THIS.

Data retrieved from NASA's ASRS site as of May 2009 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.