ATC tower controller reported a VFR aircraft not in communication violated class C airspace and caus...

Attributes
ACN	1495932
Time
Date	201711
Local Time Of Day	0001-0600
Place
Locale Reference	OAK.Tower
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Gulfstream V / G500 / G550
Operating Under FAR Part	Part 91
Flight Phase	Final Approach Descent
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	A-1 Husky
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Route In Use	VFR Route None
Flight Plan	VFR
Person 1
Function	Instructor Local
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 2
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Conflict Airborne Conflict Deviation - Procedural FAR Deviation - Procedural Published Material / Policy
Miss Distance	Vertical 300

Narrative:

While conducting on the job training to a trainee; aircraft X; a gulfstream was on a visual approach and descending for the airport. Aircraft Y; a husky; departed a satellite airport and their data block indicated they were requesting a VFR area tour. [Both aircraft] became a conflict 3 miles just inside the class charlie airspace. I tried to have the trainee issue a traffic alert to [the gulfstream] but he was slow and gave an incomplete traffic call instead. The pilot of [the gulfstream] responded that they had a TCAS RA and were responding. I then had the developmental issue the go around procedure to [the gulfstream]; a heading 315 and maintain 3000 feet. The pilot of the husky never checked onto our frequency until he was inside the class charlie airspace and after the gulfstream was already going around. The closest proximity I observed was 300 feet vertically. The husky was never given the brasher warning and transitioned through tower class C airspace. The area where [both aircraft] became a conflict is a constant hot spot for aircraft arriving with aircraft landing or departing this adjacent airport. There needs to be either an airspace redesign or a better route for aircraft into; or out of this airport so they are not a constant conflict with other airport arrivals. Also perhaps an altitude restriction for VFR airport departures to keep them below aircraft landing at other airports.

Original NASA ASRS Text

Title: ATC Tower Controller reported a VFR aircraft not in communication violated Class C airspace and caused an arriving aircraft; on short final; to respond to a TCAS/RA and go around.

Narrative: While conducting on the job training to a trainee; Aircraft X; a Gulfstream was on a Visual Approach and descending for the airport. Aircraft Y; a Husky; departed a satellite airport and their data block indicated they were requesting a VFR area tour. [Both aircraft] became a conflict 3 miles just inside the Class Charlie airspace. I tried to have the trainee issue a traffic alert to [the Gulfstream] but he was slow and gave an incomplete traffic call instead. The pilot of [the Gulfstream] responded that they had a TCAS RA and were responding. I then had the developmental issue the go around procedure to [the Gulfstream]; a heading 315 and maintain 3000 feet. The pilot of the Husky never checked onto our frequency until he was inside the Class Charlie airspace and after the Gulfstream was already going around. The closest proximity I observed was 300 feet vertically. The Husky was never given the Brasher warning and transitioned through Tower Class C airspace. The area where [both Aircraft] became a conflict is a constant hot spot for aircraft arriving with aircraft landing or departing this adjacent airport. There needs to be either an airspace redesign or a better route for aircraft into; or out of this airport so they are not a constant conflict with other airport arrivals. Also perhaps an altitude restriction for VFR airport departures to keep them below aircraft landing at other airports.

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.

ATC tower controller reported a VFR aircraft not in communication violated class C airspace and caused an arriving aircraft; on short final; to respond to a TCAS/RA and go around.