A B737 flight crew have a last min change which resulted in a crossing restr not being met.

Attributes
ACN	603496
Time
Date	200312
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : sct.artcc
State Reference	CA
Altitude	msl bound lower : 11500 msl bound upper : 12000
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	arrival star : civet
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	603496
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
ASRS Report	603720
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance non adherence : far non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued advisory
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Airspace Structure ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Passing over civet for the civet 4 arrival at FL180 we were cleared for the mitts arrival to runway 24R at lax. We had briefed and loaded the FMC's for the civet 4 runway 25R at lax. In trying to accommodate the last min change the mitts arrival was loaded but the civet transition was not selected. Snorkel intersection was not loaded. We crossed mitts between 10000 ft and 11000 ft as depicted. The controller informed us that we did not cross snorkel at or above 12000 ft. He was correct. Our attempt to accommodate the controllers change of arrival caused us to rush our cockpit duties which resulted in the mistake. In the future I will refuse to accept a change in arrival once we have begun the descent for another. We simply require more planning. Socal is known for last min arrival and runway changes coupled with maintaining abnormal airspeed request while on the approach. Their lack of airspace management and planning continues because pilots are too often willing to accommodate them. I will request vectors for another sequence in the future.

Original NASA ASRS Text

Title: A B737 FLT CREW HAVE A LAST MIN CHANGE WHICH RESULTED IN A XING RESTR NOT BEING MET.

Narrative: PASSING OVER CIVET FOR THE CIVET 4 ARR AT FL180 WE WERE CLRED FOR THE MITTS ARR TO RWY 24R AT LAX. WE HAD BRIEFED AND LOADED THE FMC'S FOR THE CIVET 4 RWY 25R AT LAX. IN TRYING TO ACCOMMODATE THE LAST MIN CHANGE THE MITTS ARR WAS LOADED BUT THE CIVET TRANSITION WAS NOT SELECTED. SNORKEL INTXN WAS NOT LOADED. WE CROSSED MITTS BTWN 10000 FT AND 11000 FT AS DEPICTED. THE CTLR INFORMED US THAT WE DID NOT CROSS SNORKEL AT OR ABOVE 12000 FT. HE WAS CORRECT. OUR ATTEMPT TO ACCOMMODATE THE CTLRS CHANGE OF ARR CAUSED US TO RUSH OUR COCKPIT DUTIES WHICH RESULTED IN THE MISTAKE. IN THE FUTURE I WILL REFUSE TO ACCEPT A CHANGE IN ARR ONCE WE HAVE BEGUN THE DSCNT FOR ANOTHER. WE SIMPLY REQUIRE MORE PLANNING. SOCAL IS KNOWN FOR LAST MIN ARR AND RWY CHANGES COUPLED WITH MAINTAINING ABNORMAL AIRSPD REQUEST WHILE ON THE APCH. THEIR LACK OF AIRSPACE MGMNT AND PLANNING CONTINUES BECAUSE PLTS ARE TOO OFTEN WILLING TO ACCOMMODATE THEM. I WILL REQUEST VECTORS FOR ANOTHER SEQUENCE IN THE FUTURE.

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.