Small Aircraft; High Wing; 1 Eng; Fixed Gear
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 2
Confusion; Communication Breakdown; Distraction; Situational Awareness
ATC Issue All Types; Airspace Violation All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Provided Assistance
Human Factors; Procedure
Aircraft Y flying northbound on a NCT sector tag penetrated Delta airspace without coordination. Converging traffic advisories issued to Aircraft X on HWD frequency on final about Aircraft Y converging. Called NCT to tell them to turn Aircraft Y to the east to clear Delta airspace. The controller stated that he had traffic in sight but never initiated a point out to transition through Delta airspace nor bothered to call HWD to advise that his Aircraft Y had Aircraft X in sight. Familiarize NCT controllers about point outs prior to entering Delta airspace or remain completely clear of it.
HWD Tower Controller reported of Class Delta airspace violation.  The Controller working the Approach Control position was called by HWD Tower Controller and asked about the violating aircraft. Converging traffic was being worked by the Tower Controller. Overlying TRACON Controller never asked for a point out or advised that visual separation was being used.