Air carrier widebody transport on parallel approach sfo deviated when perceived medium large transport following for parallel runway overtaking and too close.

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Attributes
ACN	91811
Time
Date	198807
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	msl bound lower : 900 msl bound upper : 900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 14000 flight time type : 2000
ASRS Report	91811
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 750 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

We were vectored by approach control for runway 28R, and then cleared for a visual approach. I asked for traffic advisories and was given traffic ahead and traffic at 8 O'clock, an medium large transport who had us in sight and would maintain visual sep from us. The medium large transport (for runway 28L) closed rapidly with gear up just behind our left wing. I instructed the copilot to make an immediate right turn because the aircraft appeared to be on a collision course. This happened approximately 2 mi from T/D, below 1000'. The methods used to handle aircraft at sfo under visual conditions have all the necessary elements for a major incident. There are a number of changes that could be made to improve safety.

Original NASA ASRS Text

Title: ACR WDB ON PARALLEL APCH SFO DEVIATED WHEN PERCEIVED MLG FOLLOWING FOR PARALLEL RWY OVERTAKING AND TOO CLOSE.

Narrative: WE WERE VECTORED BY APCH CTL FOR RWY 28R, AND THEN CLRED FOR A VISUAL APCH. I ASKED FOR TFC ADVISORIES AND WAS GIVEN TFC AHEAD AND TFC AT 8 O'CLOCK, AN MLG WHO HAD US IN SIGHT AND WOULD MAINTAIN VISUAL SEP FROM US. THE MLG (FOR RWY 28L) CLOSED RAPIDLY WITH GEAR UP JUST BEHIND OUR LEFT WING. I INSTRUCTED THE COPLT TO MAKE AN IMMEDIATE RIGHT TURN BECAUSE THE ACFT APPEARED TO BE ON A COLLISION COURSE. THIS HAPPENED APPROX 2 MI FROM T/D, BELOW 1000'. THE METHODS USED TO HANDLE ACFT AT SFO UNDER VISUAL CONDITIONS HAVE ALL THE NECESSARY ELEMENTS FOR A MAJOR INCIDENT. THERE ARE A NUMBER OF CHANGES THAT COULD BE MADE TO IMPROVE SAFETY.

Data retrieved from NASA's ASRS site as of August 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.