Small Aircraft; Low Wing; 1 Eng; Fixed Gear
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 226; Flight Crew Total 1252; Flight Crew Type 750
Communication Breakdown; Confusion; Distraction; Situational Awareness; Time Pressure; Workload
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Became Reoriented; Flight Crew Took Evasive Action
Aircraft; Human Factors; Procedure
The aircraft I was giving instruction in; a single engine; was doing pattern work in SSI for a checkride later that morning. We were on the upwind on Runway 22. Wind was calm and clear. I heard an aircraft make a radio call for a base leg into 09J. Same CTAF frequencies. I saw a jet that appeared to be on a base leg for 09J. TCAS started going off when we were about to turn for our left crosswind leg. I kept my eyes on the jet and noticed no relative motion between the aircraft. We made an evasive turn to the right to avoid hitting the jet which just continued to turn final and land runway 4 without making any radio calls. I do not know if a jet landed in 09J the same time this happened and the pilot we almost hit just wasn't making radio calls; or was the pilot just at the wrong airport. His flight plan on [internet site] said destination SSI. The pilot saw us because he overshot the base to final turn to avoid hitting us. He never acknowledged us on the CTAF frequency. I know that airport is becoming more dangerous with incoming charter jets and general aviation flying around. If I had not known the about this particular airports traffic problem this might have been a different ending. The cause of the problem I believe is that the large aircraft are not used to coming into non-towered airfields and forget that they need to make radio calls for position reports. A tower would help with how busy SSI has become. I only fly into SSI now for taking a student for a checkride.
GA Instructor with student in the SSI Runway 22 pattern reported a near miss with a small corporate jet. The jet crew did not communicate on the SSI CTAF frequency as the FAA recommends.