Narrative:

During the arrival into lax we were descending to cross the konzl intersection at 17000 ft. The pdz 3 runway 25L arrival and approach was programmed in the FMC anticipating landing runway 25L at lax. Passing the konzl intersection we were cleared for the pdz 3 runway 24R arrival and approach. As the aircraft started to descend to the next altitude restr, I erroneously selected and activated the ILS runway 24R approach instead of selecting the pdz 3 runway 24R arrival and approach resulting in the elimination of the arrival fixes and associated altitude restrs. By the time I reprogrammed the FMS correctly we had passed the tejay intersection below the 12000 ft restr depicted on the arrival. Factors contributing to this error: 1) inadequate scrutinization of the arrival chart and FMS choices for the arrival. Arrs and approachs are almost always selected separately in the FMS thus forming a habit pattern which will not work in this case. 2) not tuning backup raw data for the arrival portion of the approach. 3) late clearance given by lax approach and changes after receiving the initial approach clearance. Late clrncs are a routine for lax approach but a difficult and too hurried of an operation for a glass cockpit aircraft.

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Original NASA ASRS Text

Title: B757 ALTDEV WHILE ON PDZ 3 INTO LAX.

Narrative: DURING THE ARR INTO LAX WE WERE DSNDING TO CROSS THE KONZL INTXN AT 17000 FT. THE PDZ 3 RWY 25L ARR AND APCH WAS PROGRAMMED IN THE FMC ANTICIPATING LNDG RWY 25L AT LAX. PASSING THE KONZL INTXN WE WERE CLRED FOR THE PDZ 3 RWY 24R ARR AND APCH. AS THE ACFT STARTED TO DSND TO THE NEXT ALT RESTR, I ERRONEOUSLY SELECTED AND ACTIVATED THE ILS RWY 24R APCH INSTEAD OF SELECTING THE PDZ 3 RWY 24R ARR AND APCH RESULTING IN THE ELIMINATION OF THE ARR FIXES AND ASSOCIATED ALT RESTRS. BY THE TIME I REPROGRAMMED THE FMS CORRECTLY WE HAD PASSED THE TEJAY INTXN BELOW THE 12000 FT RESTR DEPICTED ON THE ARR. FACTORS CONTRIBUTING TO THIS ERROR: 1) INADEQUATE SCRUTINIZATION OF THE ARR CHART AND FMS CHOICES FOR THE ARR. ARRS AND APCHS ARE ALMOST ALWAYS SELECTED SEPARATELY IN THE FMS THUS FORMING A HABIT PATTERN WHICH WILL NOT WORK IN THIS CASE. 2) NOT TUNING BACKUP RAW DATA FOR THE ARR PORTION OF THE APCH. 3) LATE CLRNC GIVEN BY LAX APCH AND CHANGES AFTER RECEIVING THE INITIAL APCH CLRNC. LATE CLRNCS ARE A ROUTINE FOR LAX APCH BUT A DIFFICULT AND TOO HURRIED OF AN OP FOR A GLASS COCKPIT ACFT.

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.