Narrative:

Idale 1 departure runway 25R las. Prior to departure, we were involved in an aircraft swap and running late on preflight. The first officer didn't program the departure runway into the FMC, and the captain didn't review the navigation routing. (Strike 1) push, start, and taxi out went normally. Approaching the departure end of the runway, tower cleared us for takeoff with a 'report departing aircraft in sight.' we then started our departure roll without updating the runway data. If we had tried to update, we would have most likely found our mistake. (Strike 2) applied RNAV procedures on departure and when we engaged the autoplt, the aircraft turned left towards point idale. After about 20 degrees of turn, I recognized the problem and corrected back towards centerline, but not before the call from ATC asking where we were going. We replied unable RNAV and requested a heading. We received a heading and phone number to call. (Strike 3) rest of the flight went normal. I called las when I got to bur, and the supervisor just wanted to know what happened. I explained the above, and he said not to worry. Considerations: do not rush yourself. Put RNAV check item on the checklist. Need backup raw data when things go wrong.

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Original NASA ASRS Text

Title: B737 FLC FAIL TO CORRECT AND VALIDATE LAS FMC RNAV DEP PROC, DRIFT OFF COURSE, RECOGNIZE THE PROB AS L30 CHALLENGES THE ERRANT RTE OF FLT.

Narrative: IDALE 1 DEP RWY 25R LAS. PRIOR TO DEP, WE WERE INVOLVED IN AN ACFT SWAP AND RUNNING LATE ON PREFLT. THE FO DIDN'T PROGRAM THE DEP RWY INTO THE FMC, AND THE CAPT DIDN'T REVIEW THE NAV ROUTING. (STRIKE 1) PUSH, START, AND TAXI OUT WENT NORMALLY. APCHING THE DEP END OF THE RWY, TWR CLRED US FOR TKOF WITH A 'RPT DEPARTING ACFT IN SIGHT.' WE THEN STARTED OUR DEP ROLL WITHOUT UPDATING THE RWY DATA. IF WE HAD TRIED TO UPDATE, WE WOULD HAVE MOST LIKELY FOUND OUR MISTAKE. (STRIKE 2) APPLIED RNAV PROCS ON DEP AND WHEN WE ENGAGED THE AUTOPLT, THE ACFT TURNED L TOWARDS POINT IDALE. AFTER ABOUT 20 DEGS OF TURN, I RECOGNIZED THE PROB AND CORRECTED BACK TOWARDS CTRLINE, BUT NOT BEFORE THE CALL FROM ATC ASKING WHERE WE WERE GOING. WE REPLIED UNABLE RNAV AND REQUESTED A HDG. WE RECEIVED A HDG AND PHONE NUMBER TO CALL. (STRIKE 3) REST OF THE FLT WENT NORMAL. I CALLED LAS WHEN I GOT TO BUR, AND THE SUPVR JUST WANTED TO KNOW WHAT HAPPENED. I EXPLAINED THE ABOVE, AND HE SAID NOT TO WORRY. CONSIDERATIONS: DO NOT RUSH YOURSELF. PUT RNAV CHK ITEM ON THE CHKLIST. NEED BACKUP RAW DATA WHEN THINGS GO WRONG.

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.