Captain of an medium large transport failed to maintain approach descent altitude during final for a visual approach and crossed the required fix 600 ft low.

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Attributes
ACN	355320
Time
Date	199612
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	msl bound lower : 2400 msl bound upper : 3000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 180 flight time total : 6000 flight time type : 780
ASRS Report	355320
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : crossing restriction not met non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were cleared for the visual to runway 19R at sfo but maintain 3000 ft until 7 mi final. We were given traffic (DC10) to look out for, on visual to left runway. In the process of looking for the DC10 and getting cleared the visual, the captain dropped to 2400 ft at 7 mi. Nothing was ever advised to us as a violation by ATC. We were then turned over to tower. The rest of approach to landing was normal.

Original NASA ASRS Text

Title: CAPT OF AN MLG FAILED TO MAINTAIN APCH DSCNT ALT DURING FINAL FOR A VISUAL APCH AND CROSSED THE REQUIRED FIX 600 FT LOW.

Narrative: WE WERE CLRED FOR THE VISUAL TO RWY 19R AT SFO BUT MAINTAIN 3000 FT UNTIL 7 MI FINAL. WE WERE GIVEN TFC (DC10) TO LOOK OUT FOR, ON VISUAL TO L RWY. IN THE PROCESS OF LOOKING FOR THE DC10 AND GETTING CLRED THE VISUAL, THE CAPT DROPPED TO 2400 FT AT 7 MI. NOTHING WAS EVER ADVISED TO US AS A VIOLATION BY ATC. WE WERE THEN TURNED OVER TO TWR. THE REST OF APCH TO LNDG WAS NORMAL.

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.