Narrative:

I was flying at 6500 ft cleared into the class B airspace over hayward on my way to clear lake, ca. I was on 135.4. It was approximately AM15. I was flying VFR with the class B clearance. The radio controller explained that there will be traffic at my 10 O'clock. I looked and said 'negative' on the traffic. I looked again and I now observed a 'large' B747, as I recall at my 10 O'clock. I could see all 4 engines. It was very close at the time. I registered my concern, as I recall, over the radio, the controller came back and explained that he wanted my plane to 'crossover above and behind' the larger airplane. I realized that we were getting too close for my comfort. At that time he directed me to turn to a heading of 270 degrees. I was flying 317 degree heading, he was directing me right at the B747. I turned to the heading. The B747 was now out of my sight under my nose. We were now closing quickly, the B747 going 250 KTS and climbing looking into the sun. He never had me in sight for I never heard that he had the traffic. I was going close to 200 mph. At this rate we would be in close proximity within 2-3 second. I decided to refuse to fly the 270 degree heading. I called on the radio and told controller I am turning to 180 degree heading to avoid the traffic. As I did that I put my nose down to keep my eye on the B747 as I completed the turn and watching the B747 climb. It passed behind me at approximately 400 ft! It never stopped at 6000 ft, it just kept on going! I came back onto the radio and told the controller that I did not appreciate him vectoring me into the path of a very large aircraft. He then vectored me out of the class B airspace and at which point I started on back to a heading of 317 degrees to clear lake. I then spoke with 120.9 then 127.8 ZOA. I never re-entered the class B airspace for I was 11.5+ DME from the oakland VOR. I feel that I did the right thing in deviating from the controller direction.

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Original NASA ASRS Text

Title: SMA HAD NMAC WITH B747 IN CLASS B AIRSPACE. POSSIBLE LTSS SYS ERROR.

Narrative: I WAS FLYING AT 6500 FT CLRED INTO THE CLASS B AIRSPACE OVER HAYWARD ON MY WAY TO CLEAR LAKE, CA. I WAS ON 135.4. IT WAS APPROX AM15. I WAS FLYING VFR WITH THE CLASS B CLRNC. THE RADIO CTLR EXPLAINED THAT THERE WILL BE TFC AT MY 10 O'CLOCK. I LOOKED AND SAID 'NEGATIVE' ON THE TFC. I LOOKED AGAIN AND I NOW OBSERVED A 'LARGE' B747, AS I RECALL AT MY 10 O'CLOCK. I COULD SEE ALL 4 ENGS. IT WAS VERY CLOSE AT THE TIME. I REGISTERED MY CONCERN, AS I RECALL, OVER THE RADIO, THE CTLR CAME BACK AND EXPLAINED THAT HE WANTED MY PLANE TO 'CROSSOVER ABOVE AND BEHIND' THE LARGER AIRPLANE. I REALIZED THAT WE WERE GETTING TOO CLOSE FOR MY COMFORT. AT THAT TIME HE DIRECTED ME TO TURN TO A HDG OF 270 DEGS. I WAS FLYING 317 DEG HDG, HE WAS DIRECTING ME RIGHT AT THE B747. I TURNED TO THE HDG. THE B747 WAS NOW OUT OF MY SIGHT UNDER MY NOSE. WE WERE NOW CLOSING QUICKLY, THE B747 GOING 250 KTS AND CLBING LOOKING INTO THE SUN. HE NEVER HAD ME IN SIGHT FOR I NEVER HEARD THAT HE HAD THE TFC. I WAS GOING CLOSE TO 200 MPH. AT THIS RATE WE WOULD BE IN CLOSE PROX WITHIN 2-3 SEC. I DECIDED TO REFUSE TO FLY THE 270 DEG HDG. I CALLED ON THE RADIO AND TOLD CTLR I AM TURNING TO 180 DEG HDG TO AVOID THE TFC. AS I DID THAT I PUT MY NOSE DOWN TO KEEP MY EYE ON THE B747 AS I COMPLETED THE TURN AND WATCHING THE B747 CLB. IT PASSED BEHIND ME AT APPROX 400 FT! IT NEVER STOPPED AT 6000 FT, IT JUST KEPT ON GOING! I CAME BACK ONTO THE RADIO AND TOLD THE CTLR THAT I DID NOT APPRECIATE HIM VECTORING ME INTO THE PATH OF A VERY LARGE ACFT. HE THEN VECTORED ME OUT OF THE CLASS B AIRSPACE AND AT WHICH POINT I STARTED ON BACK TO A HDG OF 317 DEGS TO CLEAR LAKE. I THEN SPOKE WITH 120.9 THEN 127.8 ZOA. I NEVER RE-ENTERED THE CLASS B AIRSPACE FOR I WAS 11.5+ DME FROM THE OAKLAND VOR. I FEEL THAT I DID THE RIGHT THING IN DEVIATING FROM THE CTLR DIRECTION.

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.