Narrative:

A BE58 was on final approach for runway 28R. On about a 4 mi final the baron was indicating 110 KTS ground speed. 2 mi behind the baron; on final approach for runway 28L was a B757; indicating 200 KTS. I informed the local controller of the overtake situation; and suggested that the baron be sent around to avoid this potentially dangerous situation; and to avoid the wake turbulence from the B757. When the B757 was 1 mi behind the baron; I again pointed out the overtake situation and again suggested that the baron needed to be sent around. Another controller also came over and pointed out the overtake situation and suggested a go around. The local controller did nothing until it appeared the B757 had passed the baron. The local controller told the baron to increase speed. The baron did not respond; the B757 did and said 'ok we will speed up to pass the baron.' at this time the local controller told the B757 pilot to not pass the baron; to slow down and do an s-turn to stay behind the baron. It appears on the radar scope that the B757 passes the baron. Local control then sends the baron around. The B757 lands on runway 28L. The baron is on about a 1 mi final; and the local controller has the baron make a 360 degree turn and clears the baron to land on runway 28R. No wake turbulence warning issued to the baron. It appears there were 2 violations of the 7110.65 chapter 7-6-7 for the overtake of the baron by the B757. And chapter 5-5-4 section F; 5 mi for wake turbulence for the small aircraft landing behind a B757. The only thing that could prevent this would be to give the person working the local control position additional training.

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Original NASA ASRS Text

Title: SFO TWR COORD CTLR DESCRIBED CONFLICT EVENT INVOLVING B757 OVERTAKE OF BE58 ON PARALLEL RWY; ALLEGING LCL FAILURE TO TAKE TIMELY ACTION.

Narrative: A BE58 WAS ON FINAL APCH FOR RWY 28R. ON ABOUT A 4 MI FINAL THE BARON WAS INDICATING 110 KTS GND SPD. 2 MI BEHIND THE BARON; ON FINAL APCH FOR RWY 28L WAS A B757; INDICATING 200 KTS. I INFORMED THE LCL CTLR OF THE OVERTAKE SITUATION; AND SUGGESTED THAT THE BARON BE SENT AROUND TO AVOID THIS POTENTIALLY DANGEROUS SITUATION; AND TO AVOID THE WAKE TURB FROM THE B757. WHEN THE B757 WAS 1 MI BEHIND THE BARON; I AGAIN POINTED OUT THE OVERTAKE SITUATION AND AGAIN SUGGESTED THAT THE BARON NEEDED TO BE SENT AROUND. ANOTHER CTLR ALSO CAME OVER AND POINTED OUT THE OVERTAKE SITUATION AND SUGGESTED A GAR. THE LCL CTLR DID NOTHING UNTIL IT APPEARED THE B757 HAD PASSED THE BARON. THE LCL CTLR TOLD THE BARON TO INCREASE SPD. THE BARON DID NOT RESPOND; THE B757 DID AND SAID 'OK WE WILL SPD UP TO PASS THE BARON.' AT THIS TIME THE LCL CTLR TOLD THE B757 PLT TO NOT PASS THE BARON; TO SLOW DOWN AND DO AN S-TURN TO STAY BEHIND THE BARON. IT APPEARS ON THE RADAR SCOPE THAT THE B757 PASSES THE BARON. LCL CTL THEN SENDS THE BARON AROUND. THE B757 LANDS ON RWY 28L. THE BARON IS ON ABOUT A 1 MI FINAL; AND THE LCL CTLR HAS THE BARON MAKE A 360 DEG TURN AND CLEARS THE BARON TO LAND ON RWY 28R. NO WAKE TURB WARNING ISSUED TO THE BARON. IT APPEARS THERE WERE 2 VIOLATIONS OF THE 7110.65 CHAPTER 7-6-7 FOR THE OVERTAKE OF THE BARON BY THE B757. AND CHAPTER 5-5-4 SECTION F; 5 MI FOR WAKE TURB FOR THE SMALL ACFT LNDG BEHIND A B757. THE ONLY THING THAT COULD PREVENT THIS WOULD BE TO GIVE THE PERSON WORKING THE LCL CTL POS ADDITIONAL TRAINING.

Data retrieved from NASA's ASRS site as of May 2009 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.