Narrative:

I was the pilot of an aircraft flying along us-101 southbound to the dumbarton auto bridge eastbound at 1;500 feet. Next to the bridge is [a company's] headquarters campus; where a cessna was making multiple circles over and through the traffic watch corridors. This pilot constantly flew under my aircraft within 100-200 feet without any regard for avoiding a collision. I was forced to climb 200 feet just to clear him multiple times; since he was also at 1;500 feet. When turning from us-101 south to the dumbarton bridge; I was forced to widen my turn and fly closer to the palo alto airport in order to avoid a collision. This is when a near miss collision with another aircraft occurred; and the basis of this report. Another aircraft departing from palo alto made a left crosswind departure at the dumbarton bridge. This wasn't visually noticed since I was trying to avoid a collision with the aircraft making wide turns over [the company headquarters]. Palo alto tower called out traffic at 1 o'clock in the upwind; which I said I had in sight. However; I had called the upwind traffic that just took off. The tower was talking about a different aircraft. He then told the twin aircraft about me. This is the second where we both made visual contact with each other. His position was masked by my nose; but there should have been no excuse for him not to see me. He was a low wing aircraft that should have cleared seen my position against the overcast cloud layer and with my landing lights on. We were near head on collision course with a slight left offset. We both turned to the left; with me at a 30-45 degree instant bank angle. That pilot should have listened for my route; since I said it to the tower only 2 minutes prior. Palo alto tower should have told the twin aircraft to stop his climb and level off at 1000 feet; which would have prevented our collision course. Palo alto tower also should have told the twin about me before he told me about him; which would have also caused the pilot time to think and stop his climb. Palo alto tower also did not tell any other pilot about the aircraft circling the campus; which was dangerously close to our route; and would have been a factor for the twin as well. Overall; I felt that the controller at palo alto tower failed to provide the separation to our aircraft within his airspace; and that both other aircraft pilots had no regard for scanning for traffic and demanded that other aircraft get of their way.

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Original NASA ASRS Text

Title: Pilot reports of a NMAC while avoiding another aircraft that is also close to him.

Narrative: I was the pilot of an aircraft flying along US-101 Southbound to the Dumbarton Auto Bridge Eastbound at 1;500 feet. Next to the bridge is [a company's] headquarters campus; where a Cessna was making multiple circles over and through the traffic watch corridors. This pilot constantly flew under my aircraft within 100-200 feet without any regard for avoiding a collision. I was forced to climb 200 feet just to clear him multiple times; since he was also at 1;500 feet. When turning from US-101 South to the Dumbarton Bridge; I was forced to widen my turn and fly closer to the Palo Alto Airport in order to avoid a collision. This is when a near miss collision with another aircraft occurred; and the basis of this report. Another aircraft departing from Palo Alto made a left crosswind departure at the Dumbarton Bridge. This wasn't visually noticed since I was trying to avoid a collision with the aircraft making wide turns over [the company headquarters]. Palo Alto Tower called out traffic at 1 o'clock in the upwind; which I said I had in sight. However; I had called the upwind traffic that just took off. The Tower was talking about a different aircraft. He then told the twin aircraft about me. This is the second where we both made visual contact with each other. His position was masked by my nose; but there should have been no excuse for him not to see me. He was a low wing aircraft that should have cleared seen my position against the overcast cloud layer and with my landing lights on. We were near head on collision course with a slight left offset. We both turned to the left; with me at a 30-45 degree instant bank angle. That pilot should have listened for my route; since I said it to the Tower only 2 minutes prior. Palo Alto Tower should have told the twin aircraft to stop his climb and level off at 1000 feet; which would have prevented our collision course. Palo Alto Tower also should have told the twin about me before he told me about him; which would have also caused the pilot time to think and stop his climb. Palo Alto Tower also did not tell any other pilot about the aircraft circling the campus; which was dangerously close to our route; and would have been a factor for the twin as well. Overall; I felt that the Controller at Palo Alto Tower failed to provide the separation to our aircraft within his airspace; and that both other aircraft pilots had no regard for scanning for traffic and demanded that other aircraft get of their way.

Data retrieved from NASA's ASRS site 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.