B737 on approach to sfo runway 28L executes go around when overtaken by B757 on approach to runway 2...

Attributes
ACN	522318
Time
Date	200108
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sfo.airport
State Reference	CA
Altitude	agl bound lower : 500 agl bound upper : 1000
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	tracon : o90.tracon tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing : go around
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : o90.tracon
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
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 : 9800
ASRS Report	522318
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne critical inflight encounter : wake turbulence non adherence : published procedure non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	controller : issued advisory flight crew : took evasive action flight crew : took precautionary avoidance action flight crew : executed go around
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance Airport Environmental Factor
Primary Problem	ATC Human Performance
Situations
ATC Facility	procedure or policy : o90.tracon

Narrative:

We were cleared for a visual approach to runway 28L at sfo. Bay TRACON pointed out a B757 which was approaching runway 28R. We were paired up with the B757 and were told that he was maintaining visual separation with us. We were well ahead of the B757 and according to bay TRACON, our speeds were matched. Bay approach had assigned us 180 KIAS to the san mateo bridge, which we maintained. After passing the bridge we started slowing to our final approach speed. We noticed the B757 gaining on us, still configured gear up. The B757 did not lower his landing gear until below 900 ft AGL and was still gaining on us. Our final approach speed was 140 KIAS and the first officer (PF) was configured and stabilized by 1000 ft AGL. At approximately 500 ft AGL, the B757 started to overtake us at a rapid rate and we had no choice but to go around for wake turbulence avoidance. This was our second go around for this flight. The first one was caused by insufficient separation with a runway 1R departure and was initiated by sfo tower. The extra fuel on this segment significantly reduced the stress level in the flight deck. This is the second time in about 4 yrs that I've performed back-to-back go around's at sfo due to lack of separation with heavy aircraft while maintaining ATC assigned speeds.

Original NASA ASRS Text

Title: B737 ON APCH TO SFO RWY 28L EXECUTES GAR WHEN OVERTAKEN BY B757 ON APCH TO RWY 28R.

Narrative: WE WERE CLRED FOR A VISUAL APCH TO RWY 28L AT SFO. BAY TRACON POINTED OUT A B757 WHICH WAS APCHING RWY 28R. WE WERE PAIRED UP WITH THE B757 AND WERE TOLD THAT HE WAS MAINTAINING VISUAL SEPARATION WITH US. WE WERE WELL AHEAD OF THE B757 AND ACCORDING TO BAY TRACON, OUR SPDS WERE MATCHED. BAY APCH HAD ASSIGNED US 180 KIAS TO THE SAN MATEO BRIDGE, WHICH WE MAINTAINED. AFTER PASSING THE BRIDGE WE STARTED SLOWING TO OUR FINAL APCH SPD. WE NOTICED THE B757 GAINING ON US, STILL CONFIGURED GEAR UP. THE B757 DID NOT LOWER HIS LNDG GEAR UNTIL BELOW 900 FT AGL AND WAS STILL GAINING ON US. OUR FINAL APCH SPD WAS 140 KIAS AND THE FO (PF) WAS CONFIGURED AND STABILIZED BY 1000 FT AGL. AT APPROX 500 FT AGL, THE B757 STARTED TO OVERTAKE US AT A RAPID RATE AND WE HAD NO CHOICE BUT TO GO AROUND FOR WAKE TURB AVOIDANCE. THIS WAS OUR SECOND GAR FOR THIS FLT. THE FIRST ONE WAS CAUSED BY INSUFFICIENT SEPARATION WITH A RWY 1R DEP AND WAS INITIATED BY SFO TWR. THE EXTRA FUEL ON THIS SEGMENT SIGNIFICANTLY REDUCED THE STRESS LEVEL IN THE FLT DECK. THIS IS THE SECOND TIME IN ABOUT 4 YRS THAT I'VE PERFORMED BACK-TO-BACK GAR'S AT SFO DUE TO LACK OF SEPARATION WITH HVY ACFT WHILE MAINTAINING ATC ASSIGNED SPDS.

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.

B737 on approach to sfo runway 28L executes go around when overtaken by B757 on approach to runway 28R.