Skylane 182/RG Turbo Skylane/RG
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Engineer; Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 25; Flight Crew Total 25000; Flight Crew Type 600
Situational Awareness; Distraction; Communication Breakdown
Conflict NMAC
Airport; Human Factors
We were on a VFR descent into the airport. Approach gave us a handoff to tower. As I was making contact with Tower a white Cessna passed underneath us by 200 to 300 feet. The traffic did not show up on the Garmin 430 and no warning was given by ATC. I suspect that the traffic did not have an operable transponder. They did not seem to notice our aircraft.
C182 pilot reported a NMAC with an aircraft that did not appear on their TCAS.