Narrative:

Originally told to expect pdz 4 arrival for runway 25L at lax. Due to spacing, ATC changed runway to runway 24R, pdz 4 arrival, cross mitts at 10000 ft. Aircraft was already cleared for approach, so 2000 ft was set on the MCP. Captain asked first officer to verify arrival and runway. By the time it was verified and PF input new arrival and runway into FMC, aircraft was approximately at 9550 ft (450 ft low) before mitts intersection. Approach called aircraft to say mitts was supposed to be crossed between 10000 ft and 11000 ft. Aircraft climbed back up to 10000 ft. PNF was looking down at approach plate when altitude deviation occurred. Distraction of late change to other runway precluded adequate back-up by PNF.

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Original NASA ASRS Text

Title: A B767 CREW, PREOCCUPIED WITH REPROGRAMMING THE FMS, MISSED THEIR ASSIGNED XING RESTR.

Narrative: ORIGINALLY TOLD TO EXPECT PDZ 4 ARR FOR RWY 25L AT LAX. DUE TO SPACING, ATC CHANGED RWY TO RWY 24R, PDZ 4 ARR, CROSS MITTS AT 10000 FT. ACFT WAS ALREADY CLRED FOR APCH, SO 2000 FT WAS SET ON THE MCP. CAPT ASKED FO TO VERIFY ARR AND RWY. BY THE TIME IT WAS VERIFIED AND PF INPUT NEW ARR AND RWY INTO FMC, ACFT WAS APPROX AT 9550 FT (450 FT LOW) BEFORE MITTS INTXN. APCH CALLED ACFT TO SAY MITTS WAS SUPPOSED TO BE CROSSED BTWN 10000 FT AND 11000 FT. ACFT CLBED BACK UP TO 10000 FT. PNF WAS LOOKING DOWN AT APCH PLATE WHEN ALTDEV OCCURRED. DISTR OF LATE CHANGE TO OTHER RWY PRECLUDED ADEQUATE BACK-UP BY PNF.

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.