A B767 flight crew leaves their assigned altitude prior to the designated descent point on their company approved FMS bridge visual approach to runway 28R, sfo, ca.

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Attributes
ACN	460390
Time
Date	200001
Day	Tue
Local Time Of Day	1801 To 2400
Place
State Reference	CA
Altitude	msl bound lower : 5600 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : o90.tracon
Operator	common carrier : air carrier
Make Model Name	B767-200
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 28r other
Flight Phase	descent : vacating altitude
Route In Use	approach : charted visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 130 flight time total : 8000 flight time type : 130
ASRS Report	460390
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : company policies non adherence : clearance non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to original clearance flight crew : returned to assigned altitude flight crew : became reoriented
Supplementary
Problem Areas	Environmental Factor Airspace Structure Chart Or Publication Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Our clearance was 'cleared FMS runway 28R sfo except to lower than 2500 ft.' I was identing the ILS and when I looked up the captain had started a descent below 6000 ft before trdow. I notified him of the error and he returned to 6000 ft. In the future, I will always set the most restrictive altitude in the 'box' and I will not allow myself to become distraction.

Original NASA ASRS Text

Title: A B767 FLC LEAVES THEIR ASSIGNED ALT PRIOR TO THE DESIGNATED DSCNT POINT ON THEIR COMPANY APPROVED FMS BRIDGE VISUAL APCH TO RWY 28R, SFO, CA.

Narrative: OUR CLRNC WAS 'CLRED FMS RWY 28R SFO EXCEPT TO LOWER THAN 2500 FT.' I WAS IDENTING THE ILS AND WHEN I LOOKED UP THE CAPT HAD STARTED A DSCNT BELOW 6000 FT BEFORE TRDOW. I NOTIFIED HIM OF THE ERROR AND HE RETURNED TO 6000 FT. IN THE FUTURE, I WILL ALWAYS SET THE MOST RESTRICTIVE ALT IN THE 'BOX' AND I WILL NOT ALLOW MYSELF TO BECOME DISTR.

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.