Cessna 150
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Instructor
Flight Crew Last 90 Days 115; Flight Crew Total 8500; Flight Crew Type 250
Situational Awareness
Conflict NMAC
General None Reported / Taken
Human Factors
[We were] 2 miles west of the Campbell airport (C81). I was conducting a training flight in the Cessna 150. The sky condition was marginal VFR with scattered and broken clouds at 3;000 feet. I found an opening that allowed us to fly 500 feet below and 2;000 feet horizontal from the clouds. At this time I had observed a Cessna 421 at a slight right descending turn; at our approximately 11:30 position and a quarter-mile in distance. By my estimate we passed each other at less than 500 feet. We continued our training flight and landed at C81. As for corrective actions: I will now always contact Approach Control while doing maneuvers in this area. Highly recommend to flight school owner the installation of ADS-B in and out equipment in our training aircraft. Change my personal and flight school policy about flying in marginal VFR conditions.
C150 flight instructor reported an NMAC with another light aircraft in the vicinity of C81 airport.