Narrative:

We were going from sfo-sna. The original route was: offshore 3 sxc sna, that was entered into the FMC. Later we were given the porte 2 flw departing runway 10R. On taxi out ground control told us to expect runway 10L, each time we would change the FMC. Approaching runway 10L we were again switched to runway 10R, reselecting runway 10R in the FMC. On the porte 2 departure, before intercept oak 135 degree radial, we were cleared direct wages. After passing wages intersection ZOA asked us where were we going. We turned up the scale on our HSI and realized we were heading to mqo not flw like our clearance had stated. No separation problem resulted from the navigation error. What we feel happened after some investigation was when I entered the runway changes and the departure change into the FMC, I did not enter runway, SID, transition like the flight manual tells us. But I went left to right and entered SID, transition, runway, this left mqo in the legs page but not the route page. The route page was checked but not the legs page, this also would have caused my mistake.

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Original NASA ASRS Text

Title: LGT FO ADMITS TO A NAV ERROR. HE HAD FAILED TO FOLLOW PROC WHEN ENTERING RWY AND DEP PROCS INTO THE FMC AND LATER FOUND, VIA ATC, THAT THE ACFT WAS HEADING TO OTHER PLACES NOT IN CLRNC.

Narrative: WE WERE GOING FROM SFO-SNA. THE ORIGINAL RTE WAS: OFFSHORE 3 SXC SNA, THAT WAS ENTERED INTO THE FMC. LATER WE WERE GIVEN THE PORTE 2 FLW DEPARTING RWY 10R. ON TAXI OUT GND CTL TOLD US TO EXPECT RWY 10L, EACH TIME WE WOULD CHANGE THE FMC. APCHING RWY 10L WE WERE AGAIN SWITCHED TO RWY 10R, RESELECTING RWY 10R IN THE FMC. ON THE PORTE 2 DEP, BEFORE INTERCEPT OAK 135 DEG RADIAL, WE WERE CLRED DIRECT WAGES. AFTER PASSING WAGES INTXN ZOA ASKED US WHERE WERE WE GOING. WE TURNED UP THE SCALE ON OUR HSI AND REALIZED WE WERE HEADING TO MQO NOT FLW LIKE OUR CLRNC HAD STATED. NO SEPARATION PROB RESULTED FROM THE NAV ERROR. WHAT WE FEEL HAPPENED AFTER SOME INVESTIGATION WAS WHEN I ENTERED THE RWY CHANGES AND THE DEP CHANGE INTO THE FMC, I DID NOT ENTER RWY, SID, TRANSITION LIKE THE FLT MANUAL TELLS US. BUT I WENT L TO R AND ENTERED SID, TRANSITION, RWY, THIS LEFT MQO IN THE LEGS PAGE BUT NOT THE RTE PAGE. THE RTE PAGE WAS CHKED BUT NOT THE LEGS PAGE, THIS ALSO WOULD HAVE CAUSED MY MISTAKE.

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.