A B757 on the lax civet prior to rustt intersection was changed from 24R to 25L. Captain descended low on profile as first officer worked FMS for new approach.

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Attributes
ACN	763370
Time
Date	200711
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl single value : 8600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B717
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : civet
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 170 flight time total : 18500 flight time type : 4000
ASRS Report	763370
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : overshoot non adherence : clearance non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Descending on civet five arrival; for runway 24R. Just prior to rustt intersection socal approach changes our runway to runway 25L to descend on civet five arrival. Captain is flying. I change arrs; socal tells us to slow to 280 KTS. As I am cleaning up arrival socal tells us to slow to 250 KTS. The captain is now high on descent profile. Captain selects flight level change. We have some route discontinuity that I am trying to close up. As I get the route closed up; and am now back heads up; approximately 2 1/2 mi from taroc captain realizes he is below 9000 ft and stops descent at 8600 ft. I read altitudes off chart to captain. We regained descent profile in VNAV mode. WX was VFR; day; no mention of being low on profile from socal approach. There was no conflict with any traffic. Last min runway change and speed changes created havoc momentarily. Once runway is assigned it would be better if we stayed on that arrival transition.

Original NASA ASRS Text

Title: A B757 ON THE LAX CIVET PRIOR TO RUSTT INTXN WAS CHANGED FROM 24R TO 25L. CAPT DSNDED LOW ON PROFILE AS FO WORKED FMS FOR NEW APCH.

Narrative: DSNDING ON CIVET FIVE ARR; FOR RWY 24R. JUST PRIOR TO RUSTT INTXN SOCAL APCH CHANGES OUR RWY TO RWY 25L TO DSND ON CIVET FIVE ARR. CAPT IS FLYING. I CHANGE ARRS; SOCAL TELLS US TO SLOW TO 280 KTS. AS I AM CLEANING UP ARR SOCAL TELLS US TO SLOW TO 250 KTS. THE CAPT IS NOW HIGH ON DSCNT PROFILE. CAPT SELECTS FLT LEVEL CHANGE. WE HAVE SOME RTE DISCONTINUITY THAT I AM TRYING TO CLOSE UP. AS I GET THE RTE CLOSED UP; AND AM NOW BACK HEADS UP; APPROX 2 1/2 MI FROM TAROC CAPT REALIZES HE IS BELOW 9000 FT AND STOPS DSCNT AT 8600 FT. I READ ALTS OFF CHART TO CAPT. WE REGAINED DSCNT PROFILE IN VNAV MODE. WX WAS VFR; DAY; NO MENTION OF BEING LOW ON PROFILE FROM SOCAL APCH. THERE WAS NO CONFLICT WITH ANY TFC. LAST MIN RWY CHANGE AND SPD CHANGES CREATED HAVOC MOMENTARILY. ONCE RWY IS ASSIGNED IT WOULD BE BETTER IF WE STAYED ON THAT ARR TRANSITION.

Data retrieved from NASA's ASRS site as of January 2009 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.