An A320 captain reported a heading and altitude deviation on the pdz arrival to lax.

Attributes
ACN	510520
Time
Date	200105
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl bound lower : 11700 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	A320
Flight Phase	descent : approach
Route In Use	arrival star : paradise 9
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 12000 flight time type : 900
ASRS Report	510520
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : published procedure non adherence : company policies non adherence : far non adherence : clearance other spatial deviation
Resolutory Action	flight crew : overrode automation
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Autoplt deviated from horizontal and vertical profile on pdz 4 arrival to lax. Did not level at tejay. This could have been caused by sct approach assigning a runway that required an FMS mcdu change while on the arrival. Captain took over manually (autoplt off), returned to course (maximum of about .8 mi) and altitude (300 ft low for 5 seconds or less), then resumed the programmed arrival.

Original NASA ASRS Text

Title: AN A320 CAPT RPTED A HDG AND ALTDEV ON THE PDZ ARR TO LAX.

Narrative: AUTOPLT DEVIATED FROM HORIZ AND VERT PROFILE ON PDZ 4 ARR TO LAX. DID NOT LEVEL AT TEJAY. THIS COULD HAVE BEEN CAUSED BY SCT APCH ASSIGNING A RWY THAT REQUIRED AN FMS MCDU CHANGE WHILE ON THE ARR. CAPT TOOK OVER MANUALLY (AUTOPLT OFF), RETURNED TO COURSE (MAX OF ABOUT .8 MI) AND ALT (300 FT LOW FOR 5 SECONDS OR LESS), THEN RESUMED THE PROGRAMMED ARR.

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.