Pao controller described a near midair collision when traffic on a right base to nuq runway 14 repor...

Narrative:

Pao was on runway 13 and nuq was on runway 14. Nuq had a C130 inbound on the right downwind; pao had several aircraft in the pattern. Nct pointed out the C130 and nuq took their airspace back (it's normal for pao to take a portion of nuq's airspace) as the C130 turned right base there were several aircraft in the upwind/crosswind from pao. I quoted the traffic to my aircraft; everything went fine from my point of view. Their aircraft stayed in their airspace and my aircraft stayed in mine. These things are normal when we're on these runway configurations. Three hours later I get a call from nct telling me that the C130 pilot called in a near midair collision for one of my pattern workers. I saw the guy turning base; it wasn't even close. Maybe his TCAS went off or he wasn't expecting to see my little guy there or something I don't know. Pilots need to be given a heads up that there's a busy VFR tower right next door so they won't freak out. We've never had this issue with aircraft that are based at nuq. Pao needs more airspace.

Original NASA ASRS Text

Title: PAO Controller described a NMAC when traffic on a right base to NUQ Runway 14 reported a conflict with traffic in the pattern at PAO for Runway 13; the reporter noting unfamiliar pilots landing NUQ in this configuration should be advised of VFR traffic at PAO.

Narrative: PAO was on Runway 13 and NUQ was on Runway 14. NUQ had a C130 inbound on the right downwind; PAO had several aircraft in the pattern. NCT pointed out the C130 and NUQ took their airspace back (it's normal for PAO to take a portion of NUQ's airspace) as the C130 turned right base there were several aircraft in the upwind/crosswind from PAO. I quoted the traffic to my aircraft; everything went fine from my point of view. Their aircraft stayed in their airspace and my aircraft stayed in mine. These things are normal when we're on these runway configurations. Three hours later I get a call from NCT telling me that the C130 pilot called in a NMAC for one of my pattern workers. I saw the guy turning base; it wasn't even close. Maybe his TCAS went off or he wasn't expecting to see my little guy there or something I don't know. Pilots need to be given a heads up that there's a busy VFR Tower right next door so they won't freak out. We've never had this issue with aircraft that are based at NUQ. PAO needs more airspace.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1004242
Time
Date	201204
Local Time Of Day	1201-1800
Place
Locale Reference	PAO.Airport
State Reference	CA
Aircraft 1
Make Model Name	Hercules (C-130)
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	None
Flight Plan	VFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Conflict NMAC

Pao controller described a near midair collision when traffic on a right base to nuq runway 14 reported a conflict with traffic in the pattern at pao for runway 13; the reporter noting unfamiliar pilots landing nuq in this configuration should be advised of VFR traffic at pao.