B757 crew had altitude overshoot in sct class B airspace.

Attributes
ACN	493589
Time
Date	200011
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	intersection : tejay
State Reference	CA
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : vacating altitude
Route In Use	arrival star : pdz 4
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	493589
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
ASRS Report	493590
Events
Anomaly	altitude deviation : overshoot non adherence : published procedure non adherence : clearance non adherence : company policies other anomaly other
Independent Detector	atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : issued new clearance controller : issued alert
Consequence	other
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Descended below altitude restr prior to waypoint. Switched to flight level change to slow to 250 KTS and was looking for traffic when I descended below tejay restr prior to waypoint. Was looking outside when I should have been looking inside. ATC said maintain 11000 ft until arnes.

Original NASA ASRS Text

Title: B757 CREW HAD ALT OVERSHOOT IN SCT CLASS B AIRSPACE.

Narrative: DSNDED BELOW ALT RESTR PRIOR TO WAYPOINT. SWITCHED TO FLT LEVEL CHANGE TO SLOW TO 250 KTS AND WAS LOOKING FOR TFC WHEN I DSNDED BELOW TEJAY RESTR PRIOR TO WAYPOINT. WAS LOOKING OUTSIDE WHEN I SHOULD HAVE BEEN LOOKING INSIDE. ATC SAID MAINTAIN 11000 FT UNTIL ARNES.

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.