Controller failed to provide radar separation between an aircraft on the ILS approach and an aircraft being vectored for visual approach to the parallel runway.

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Attributes
ACN	143595
Time
Date	199004
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sfo
State Reference	CA
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport
Flight Phase	descent other landing other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent other landing other
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 195 flight time total : 9475 flight time type : 2700
ASRS Report	143595
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 2500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was flying the aircraft on the ILS to runway 28R at sfo. Just outside the LOM approach control called traffic to us at 9-10 O'clock, an light transport at 2000'. WX was broken to overcast at approximately 2000'. When we broke out at about 1900' the captain and I both saw the traffic at the same time at 9 O'clock, headed directly at us. Before I could react, the light transport turned right and passed behind us. Distance was approximately 1/2 mi sep. The landing was uneventful and the captain called ATC to report the incident. Contributing factors were the WX and possibly controller overload.

Original NASA ASRS Text

Title: CTLR FAILED TO PROVIDE RADAR SEPARATION BETWEEN AN ACFT ON THE ILS APCH AND AN ACFT BEING VECTORED FOR VISUAL APCH TO THE PARALLEL RWY.

Narrative: I WAS FLYING THE ACFT ON THE ILS TO RWY 28R AT SFO. JUST OUTSIDE THE LOM APCH CTL CALLED TFC TO US AT 9-10 O'CLOCK, AN LTT AT 2000'. WX WAS BROKEN TO OVCST AT APPROX 2000'. WHEN WE BROKE OUT AT ABOUT 1900' THE CAPT AND I BOTH SAW THE TFC AT THE SAME TIME AT 9 O'CLOCK, HEADED DIRECTLY AT US. BEFORE I COULD REACT, THE LTT TURNED RIGHT AND PASSED BEHIND US. DISTANCE WAS APPROX 1/2 MI SEP. THE LNDG WAS UNEVENTFUL AND THE CAPT CALLED ATC TO RPT THE INCIDENT. CONTRIBUTING FACTORS WERE THE WX AND POSSIBLY CTLR OVERLOAD.

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.