Narrative:

First officer was flying the IDALE1.hec departure. Approaching andyy fix, las departure control cleared us direct boach fix and issued further climb. I entered the fix in the FMC and the altitude in the MCP. First officer confirmed both. ATC later gave us a turn approximately 25 degrees left for direct boach. We both realized FMS was commanding a course for direct hec. I believe that at the time the clearance for direct boach was received, I must have seen it was line-selectable in the FMC. In the slight delay I took to select it, we passed over andyy fix. Boach would then become the '2L' button on the FMC. I, however, mistakenly pushed 3L anyway, which would have selected hec as the new 'direct to' fix. This was executed, and neither PNF nor PF realized it. In the future, I will be more cognizant of exactly what is in the FMC before I execute, and back it up with the display on the ehsi. Supplemental information from acn 565868: I was PF and watched and confirmed that captain line selected boach to top of legs page and hit enter. I turned aircraft to go direct and called for LNAV. A few mins later, ATC said we were not going direct. I have no explanation as to how the FMC changed from direct boach to hec. I did not see it on the map page on the navigation display because I was on the 10 setting.

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Original NASA ASRS Text

Title: THE REPROGRAMMING REQUIRED BECAUSE OF A ROUTING CHANGE ENDS IN A TRACK DEV ON THE IDALE RNAV 1 DEP FROM LAS, NV.

Narrative: FO WAS FLYING THE IDALE1.HEC DEP. APCHING ANDYY FIX, LAS DEP CTL CLRED US DIRECT BOACH FIX AND ISSUED FURTHER CLB. I ENTERED THE FIX IN THE FMC AND THE ALT IN THE MCP. FO CONFIRMED BOTH. ATC LATER GAVE US A TURN APPROX 25 DEGS L FOR DIRECT BOACH. WE BOTH REALIZED FMS WAS COMMANDING A COURSE FOR DIRECT HEC. I BELIEVE THAT AT THE TIME THE CLRNC FOR DIRECT BOACH WAS RECEIVED, I MUST HAVE SEEN IT WAS LINE-SELECTABLE IN THE FMC. IN THE SLIGHT DELAY I TOOK TO SELECT IT, WE PASSED OVER ANDYY FIX. BOACH WOULD THEN BECOME THE '2L' BUTTON ON THE FMC. I, HOWEVER, MISTAKENLY PUSHED 3L ANYWAY, WHICH WOULD HAVE SELECTED HEC AS THE NEW 'DIRECT TO' FIX. THIS WAS EXECUTED, AND NEITHER PNF NOR PF REALIZED IT. IN THE FUTURE, I WILL BE MORE COGNIZANT OF EXACTLY WHAT IS IN THE FMC BEFORE I EXECUTE, AND BACK IT UP WITH THE DISPLAY ON THE EHSI. SUPPLEMENTAL INFO FROM ACN 565868: I WAS PF AND WATCHED AND CONFIRMED THAT CAPT LINE SELECTED BOACH TO TOP OF LEGS PAGE AND HIT ENTER. I TURNED ACFT TO GO DIRECT AND CALLED FOR LNAV. A FEW MINS LATER, ATC SAID WE WERE NOT GOING DIRECT. I HAVE NO EXPLANATION AS TO HOW THE FMC CHANGED FROM DIRECT BOACH TO HEC. I DID NOT SEE IT ON THE MAP PAGE ON THE NAV DISPLAY BECAUSE I WAS ON THE 10 SETTING.

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.