Brasilia EMB-120 All Series
Air Traffic Control Fully Certified
Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict
General None Reported / Taken
Procedure; Human Factors
Air Carrier X was talking to SOCAL Approach/Del Mar Sector when they were cleared for the visual approach 8 NM North of CRQ. They were descending rapidly and I was not yet talking to them when I had a traffic conflict 3NM South of Air Carrier X; a Cessna flying North right into Air Carrier X. I called the traffic to the Cessna but was not talking to Air Carrier X yet. SOCAL switched Air Carrier X without giving them any traffic information. Within 2 seconds the CA warning went off and I had to take immediate action. I restricted both aircraft's altitudes. I would recommend that SOCAL resolves all traffic conflicts before switching aircraft to us. Also; if not then; they should call over and coordinate the aircraft's intentions before switching them.
CRQ Controller described a conflict event when SCT failed to resolve and was not timely in transferring an aircraft on a visual approach to the Tower.