B737 crew descends below published altitude on seavu 1 arrival to lax after late runway change.

Attributes
ACN	734932
Time
Date	200704
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl bound lower : 11700 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : sct.tracon tower : lit.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	arrival star : seavu
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 258
ASRS Report	734932
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : overshoot non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	ATC Human Performance Airspace Structure Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Flying the seavu 1 arrival into lax. ATC advised to expect runway 24R. Right before dixxn fix; ATC switched runway to runway 25L. First officer changed the FMC from runway 24R to runway 25L. After the runway change; the FMC showed the next altitude restr as krain at 10000 ft and the fix before krain; dixxn; as an unrestr altitude of approximately 11650 ft. The first officer changed the MCP to the 10000 ft krain restr after verbally announcing intentions to the captain. The captain flying continued the descent until he noticed the 12000 ft or above restr on his approach plate at dixxn; which is prior to krain; and immediately stopped the descent and climbed at approximately 11700 ft a couple mi before dixxn. The dixxn altitude crossing restr was satisfied. ATC did not say anything regarding the altitude prior to dixxn and the rest of the approach was uneventful. Crews need to verify the FMC data with the approach plate data in all sits. This is especially true after a requirement to make a last min change to the FMC data such as after a late runway change.

Original NASA ASRS Text

Title: B737 CREW DESCENDS BELOW PUBLISHED ALTITUDE ON SEAVU 1 ARRIVAL TO LAX AFTER LATE RUNWAY CHANGE.

Narrative: FLYING THE SEAVU 1 ARR INTO LAX. ATC ADVISED TO EXPECT RWY 24R. RIGHT BEFORE DIXXN FIX; ATC SWITCHED RWY TO RWY 25L. FO CHANGED THE FMC FROM RWY 24R TO RWY 25L. AFTER THE RWY CHANGE; THE FMC SHOWED THE NEXT ALT RESTR AS KRAIN AT 10000 FT AND THE FIX BEFORE KRAIN; DIXXN; AS AN UNRESTR ALT OF APPROX 11650 FT. THE FO CHANGED THE MCP TO THE 10000 FT KRAIN RESTR AFTER VERBALLY ANNOUNCING INTENTIONS TO THE CAPT. THE CAPT FLYING CONTINUED THE DSCNT UNTIL HE NOTICED THE 12000 FT OR ABOVE RESTR ON HIS APCH PLATE AT DIXXN; WHICH IS PRIOR TO KRAIN; AND IMMEDIATELY STOPPED THE DSCNT AND CLBED AT APPROX 11700 FT A COUPLE MI BEFORE DIXXN. THE DIXXN ALT XING RESTR WAS SATISFIED. ATC DID NOT SAY ANYTHING REGARDING THE ALT PRIOR TO DIXXN AND THE REST OF THE APCH WAS UNEVENTFUL. CREWS NEED TO VERIFY THE FMC DATA WITH THE APCH PLATE DATA IN ALL SITS. THIS IS ESPECIALLY TRUE AFTER A REQUIREMENT TO MAKE A LAST MIN CHANGE TO THE FMC DATA SUCH AS AFTER A LATE RWY CHANGE.

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.