Narrative:

We were being vectored for the visual approach 28R at sfo. Bay approach gave us a heading of 100 degrees after crossing sfo VOR. They gave us a descent from 5000 to 4000' and told us to expect approach clearance in 12 mi. At 10 DME we were cleared down to 3000'. At 11 DME we were issued a heading of 240 degrees. While in the turn approach issued traffic--an medium large transport at 1 O'clock and an air carrier small transport at 12 O'clock. We had both in sight and continued down to 3000' and 240 degree heading. We maintained 30 degree bank at 160 KTS. Bay told us to maintain visibility and cleared us for the visibility approach 28R along side the small transport. The small transport was told to maintain visibility with us and cleared for the visibility 28L. The small transport appeared to be at 4000-4500' on a 310-330 degree heading converging towards us. It was never clear to us from their conversation as to whether they had us in sight. They said to bay they 'just had a light twin like an small transport pass under (them) about 1500'.' our rate of turn and air carrier late approach clearance and poor line up vector caused both aircraft to fly slightly through their respective runway # centerlines. Realizing the situation bay approach switched runways for both of us. No evasive action was required. We were both handed off to tower and nothing further was said. This situation could have been prevented if: 1) extended our downwind before turning us onto visibility approach, 2) turned us ono approach earlier, and 3) lesser intercept angle for wings.

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Original NASA ASRS Text

Title: CROSSOVER ON VISUAL APCH.

Narrative: WE WERE BEING VECTORED FOR THE VISUAL APCH 28R AT SFO. BAY APCH GAVE US A HDG OF 100 DEGS AFTER XING SFO VOR. THEY GAVE US A DSCNT FROM 5000 TO 4000' AND TOLD US TO EXPECT APCH CLRNC IN 12 MI. AT 10 DME WE WERE CLRED DOWN TO 3000'. AT 11 DME WE WERE ISSUED A HDG OF 240 DEGS. WHILE IN THE TURN APCH ISSUED TFC--AN MLG AT 1 O'CLOCK AND AN ACR SMT AT 12 O'CLOCK. WE HAD BOTH IN SIGHT AND CONTINUED DOWN TO 3000' AND 240 DEG HDG. WE MAINTAINED 30 DEG BANK AT 160 KTS. BAY TOLD US TO MAINTAIN VIS AND CLRED US FOR THE VIS APCH 28R ALONG SIDE THE SMT. THE SMT WAS TOLD TO MAINTAIN VIS WITH US AND CLRED FOR THE VIS 28L. THE SMT APPEARED TO BE AT 4000-4500' ON A 310-330 DEG HDG CONVERGING TOWARDS US. IT WAS NEVER CLEAR TO US FROM THEIR CONVERSATION AS TO WHETHER THEY HAD US IN SIGHT. THEY SAID TO BAY THEY 'JUST HAD A LIGHT TWIN LIKE AN SMT PASS UNDER (THEM) ABOUT 1500'.' OUR RATE OF TURN AND ACR LATE APCH CLRNC AND POOR LINE UP VECTOR CAUSED BOTH ACFT TO FLY SLIGHTLY THROUGH THEIR RESPECTIVE RWY # CENTERLINES. REALIZING THE SITUATION BAY APCH SWITCHED RWYS FOR BOTH OF US. NO EVASIVE ACTION WAS REQUIRED. WE WERE BOTH HANDED OFF TO TWR AND NOTHING FURTHER WAS SAID. THIS SITUATION COULD HAVE BEEN PREVENTED IF: 1) EXTENDED OUR DOWNWIND BEFORE TURNING US ONTO VIS APCH, 2) TURNED US ONO APCH EARLIER, AND 3) LESSER INTERCEPT ANGLE FOR WINGS.

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.