Narrative:

Aircraft X was inbound IFR on the GPS runway 31 approach. Aircraft Y; a VFR flight of 3 [military aircraft]; was holding over moffett field (nuq) in a left orbit at approximately 1;100 feet waiting for the appropriate time to overfly levi stadium. I issued traffic to aircraft X when the flight of 3 were approximately 3 NM away and he reported the traffic insight. The [flight of 3] turned left directly towards aircraft X on the approach at a similar altitude. Aircraft X continued his transmission reporting them insight and said he was turning to avoid them as they turned into him around a 3NM final to runway 31. After he passed the traffic I asked if aircraft X had the airport in sight; he replied he did. He then mentioned wanting to talk about the jets passing him and I replied that I would give him the tower number to call once he landed. After aircraft X landed without incident; I gave him the tower number and when he called he wanted to report the near midair collision. This was the second near midair collision report I had to file with one of my IFR arrivals and aircraft Y [flight] orbiting over moffett field in less than 15 minutes. I had tried earlier to coordinate with moffett to ensure the [flight of 3] wouldn't be a conflict with aircraft X inbound and still a situation developed. I was given an impression that moffett was having some difficulty with holding instructions to flight; but not something I can confirm. Either way; the speed the [flight of 3] were orbiting over nuq made it very hard for me to miss with my slower traffic. If I had a better idea of what they were doing; I could then issue better advisories to my pilots to avoid the unsafe proximity they got into. On occasion there was military fly over/bys at levi stadium. It might help if in the planning phases for these events that a representative from moffett; san jose; palo alto; norcal approach and the flight all have a conference call or in person meeting to discuss the operation so that everyone can get on the same page and avoid anything like this from happening again.

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Original NASA ASRS Text

Title: Controllers and GA pilot reported a NMAC with military aircraft holding for a fly over.

Narrative: Aircraft X was inbound IFR on the GPS Runway 31 approach. Aircraft Y; a VFR flight of 3 [military aircraft]; was holding over Moffett Field (NUQ) in a left orbit at approximately 1;100 feet waiting for the appropriate time to overfly Levi Stadium. I issued traffic to Aircraft X when the flight of 3 were approximately 3 NM away and he reported the traffic insight. The [flight of 3] turned left directly towards Aircraft X on the approach at a similar altitude. Aircraft X continued his transmission reporting them insight and said he was turning to avoid them as they turned into him around a 3NM final to Runway 31. After he passed the traffic I asked if Aircraft X had the airport in sight; he replied he did. He then mentioned wanting to talk about the jets passing him and I replied that I would give him the tower number to call once he landed. After Aircraft X landed without incident; I gave him the tower number and when he called he wanted to report the NMAC. This was the second NMAC report I had to file with one of my IFR arrivals and Aircraft Y [flight] orbiting over Moffett Field in less than 15 minutes. I had tried earlier to coordinate with Moffett to ensure the [flight of 3] wouldn't be a conflict with Aircraft X inbound and still a situation developed. I was given an impression that Moffett was having some difficulty with holding instructions to flight; but not something I can confirm. Either way; the speed the [flight of 3] were orbiting over NUQ made it very hard for me to miss with my slower traffic. If I had a better idea of what they were doing; I could then issue better advisories to my pilots to avoid the unsafe proximity they got into. On occasion there was military fly over/bys at Levi Stadium. It might help if in the planning phases for these events that a representative from Moffett; San Jose; Palo Alto; NorCal Approach and the flight all have a conference call or in person meeting to discuss the operation so that everyone can get on the same page and avoid anything like this from happening again.

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.