Narrative:

We were cleared at takeoff the flight plan route which included the acord 2 arrival at vancouver, back course from over the geg VOR. However, after passing the geg VOR, we noticed the published arrival route did not correspond with the onboard FMC route as pictured on the HSI. Immediately a correction was made to the left to fly the published route which included a dogleg to the south. The corrective procedure would be to compare and double-check the computer stored information with the published procedure well in advance of arriving at the published points along the course, and not being complacent in assuming the computer has all the correct and up to date information.

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Original NASA ASRS Text

Title: ACR MLG TRACK HEADING DEVIATION FOLLOWING ACFT COMPUTER STORED ARR ROUTE THAT DIFFERED FROM THE FLT PLANNED ROUTE.

Narrative: WE WERE CLRED AT TKOF THE FLT PLAN RTE WHICH INCLUDED THE ACORD 2 ARR AT VANCOUVER, BC FROM OVER THE GEG VOR. HOWEVER, AFTER PASSING THE GEG VOR, WE NOTICED THE PUBLISHED ARR RTE DID NOT CORRESPOND WITH THE ONBOARD FMC RTE AS PICTURED ON THE HSI. IMMEDIATELY A CORRECTION WAS MADE TO THE LEFT TO FLY THE PUBLISHED RTE WHICH INCLUDED A DOGLEG TO THE S. THE CORRECTIVE PROC WOULD BE TO COMPARE AND DOUBLE-CHK THE COMPUTER STORED INFO WITH THE PUBLISHED PROC WELL IN ADVANCE OF ARRIVING AT THE PUBLISHED POINTS ALONG THE COURSE, AND NOT BEING COMPLACENT IN ASSUMING THE COMPUTER HAS ALL THE CORRECT AND UP TO DATE INFO.

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.