A320 crew had altitude excursion on approach to runway 25L at lax.

Attributes
ACN	497590
Time
Date	200101
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl bound lower : 8899 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 25l other
Flight Phase	descent : approach descent : vacating altitude
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 15000 flight time type : 8000
ASRS Report	497590
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Airspace Structure FAA Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were cleared for the approach (CAT IIIA) at lax runway 25L. There are several crossing restrs. When we were cleared for the approach, I turned on both autoplts to the approach mode the aircraft followed the GS and localizer, but that took us under some of the crossing restrs. After we landed, I remembered that we were supposed to follow the stepdown fixes and not the GS.

Original NASA ASRS Text

Title: A320 CREW HAD ALT EXCURSION ON APCH TO RWY 25L AT LAX.

Narrative: WE WERE CLRED FOR THE APCH (CAT IIIA) AT LAX RWY 25L. THERE ARE SEVERAL XING RESTRS. WHEN WE WERE CLRED FOR THE APCH, I TURNED ON BOTH AUTOPLTS TO THE APCH MODE THE ACFT FOLLOWED THE GS AND LOC, BUT THAT TOOK US UNDER SOME OF THE XING RESTRS. AFTER WE LANDED, I REMEMBERED THAT WE WERE SUPPOSED TO FOLLOW THE STEPDOWN FIXES AND NOT THE GS.

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.