Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 41; Flight Crew Total 2160; Flight Crew Type 3
Communication Breakdown; Situational Awareness
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors
I was flying a light sport aircraft on an instructional flight. Approaching Cambridge-Dorchester County Airport; I announced my location and intentions on the 45 for left downwind Runway 16. I heard a Piper Cherokee announce its intentions as it entered the crosswind for Runway 16. I had the Cherokee in sight on the crosswind when I turned downwind and announced my position on downwind. As I was completing my downwind; I heard the Cherokee announce its position behind me on downwind. I turned base leg and announced my position. Just as I was about to turn final I heard the Cherokee announce its position on base leg and ask my intentions. At that time I observed the Cherokee pass over me approximately 100 feet above my altitude. I told the Cherokee that it had just passed over me and that it should land and I would land after it landed. The Cherokee did a touch-and-go and remained in the pattern.The Cherokee failed to monitor CTAF transmissions; and failed to make an adequate visual scan for other aircraft in the landing pattern. I failed to confirm on CTAF that the Cherokee behind me on downwind had my aircraft in sight.
Light Sport Aircraft (LSA) pilot reports being overtaken on the base leg of the VFR traffic pattern by a PA-28 that had reported entering on the crosswind but apparently never understood the location or the speed of the LSA.