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.