MD80 flight crew made a go around after the spacing looked less than desired on a visual approach for sfo parallel runways with a B757. They were also concerned about possible wake turbulence from the B757.

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Attributes
ACN	514938
Time
Date	200106
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sfo.airport
State Reference	CA
Altitude	msl bound lower : 500 msl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : o90.tracon tower : sfo.tower
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	landing : go around
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : o90.tracon tower : sfo.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer pilot : commercial pilot : cfi pilot : multi engine pilot : private pilot : instrument
Experience	flight time last 90 days : 100 flight time total : 12000 flight time type : 6000
ASRS Report	514938
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 220 flight time total : 9500 flight time type : 3000
ASRS Report	514958
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : executed go around
Miss Distance	horizontal : 3000 vertical : 500
Supplementary
Problem Areas	Airspace Structure ATC Human Performance Flight Crew Human Performance
Primary Problem	Airspace Structure

Narrative:

We were on vectors for left downwind runway 28L sfo. B757 vectors for runway 28R. Approach turned us in and told us to keep the speed up as we were #1 for runway 28L and he wanted us in front of the B757. Assigned 180 KTS or greater to brijj, B757 was asked to slow to 135 KTS. We flew 200 KTS to brijj and stayed left of centerline to maintain aircraft separation. B757 never appeared to slow and continued to stay ahead of us as he angled in from the bay. 1000 ft AGL both aircraft were approaching each runway almost abeam each other. We elected to go around as sfo runways 28L&right do not have adequate separation for simultaneous lndgs. Missed approach and return were uneventful.

Original NASA ASRS Text

Title: MD80 FLC MADE A GAR AFTER THE SPACING LOOKED LESS THAN DESIRED ON A VISUAL APCH FOR SFO PARALLEL RWYS WITH A B757. THEY WERE ALSO CONCERNED ABOUT POSSIBLE WAKE TURB FROM THE B757.

Narrative: WE WERE ON VECTORS FOR L DOWNWIND RWY 28L SFO. B757 VECTORS FOR RWY 28R. APCH TURNED US IN AND TOLD US TO KEEP THE SPD UP AS WE WERE #1 FOR RWY 28L AND HE WANTED US IN FRONT OF THE B757. ASSIGNED 180 KTS OR GREATER TO BRIJJ, B757 WAS ASKED TO SLOW TO 135 KTS. WE FLEW 200 KTS TO BRIJJ AND STAYED L OF CTRLINE TO MAINTAIN ACFT SEPARATION. B757 NEVER APPEARED TO SLOW AND CONTINUED TO STAY AHEAD OF US AS HE ANGLED IN FROM THE BAY. 1000 FT AGL BOTH ACFT WERE APCHING EACH RWY ALMOST ABEAM EACH OTHER. WE ELECTED TO GO AROUND AS SFO RWYS 28L&R DO NOT HAVE ADEQUATE SEPARATION FOR SIMULTANEOUS LNDGS. MISSED APCH AND RETURN WERE UNEVENTFUL.

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.