Narrative:

En route wbound on J80 we were filed J80 gld direct to jnc then via J80 oal . Although the route was entered into the GPS properly on the route page of the GPS, I closed up a discontinuity on the legs page and the direct routing was inadvertently removed and we flew the initial portion of J80. During our navigation check with the vors between gld and jnc we discovered the problem. I then asked for direct jnc and ATC approved my request. This can be an insidious trap because we checked the leg page with the flight plan as well as the progress page distance and the 2 points were both checked on the ground as ok.

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Original NASA ASRS Text

Title: CAPT OF DC10 FAILED TO FOLLOW THE FLT PLAN RTE DUE TO INADVERTENTLY MISPROGRAMMED FMC NAV DATABASE. AFTER THE FLC NOTED THEIR ERROR THEY WERE GIVEN A VECTOR TO BACK ON COURSE.

Narrative: ENRTE WBOUND ON J80 WE WERE FILED J80 GLD DIRECT TO JNC THEN VIA J80 OAL . ALTHOUGH THE RTE WAS ENTERED INTO THE GPS PROPERLY ON THE RTE PAGE OF THE GPS, I CLOSED UP A DISCONTINUITY ON THE LEGS PAGE AND THE DIRECT ROUTING WAS INADVERTENTLY REMOVED AND WE FLEW THE INITIAL PORTION OF J80. DURING OUR NAV CHK WITH THE VORS BTWN GLD AND JNC WE DISCOVERED THE PROB. I THEN ASKED FOR DIRECT JNC AND ATC APPROVED MY REQUEST. THIS CAN BE AN INSIDIOUS TRAP BECAUSE WE CHKED THE LEG PAGE WITH THE FLT PLAN AS WELL AS THE PROGRESS PAGE DISTANCE AND THE 2 POINTS WERE BOTH CHKED ON THE GND AS OK.

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.