Learjet 60
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 15
Communication Breakdown
Conflict Airborne Conflict
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Separated Traffic; Air Traffic Control Issued New Clearance
Procedure; Human Factors; Airport; Airspace Structure; Aircraft
I was working final sector. I had a LJ60 arrival from the west coming to SAT; I descended the LJ60 to 4;000 feet. When the LJ60 was about 20 miles from SAT I noticed a primary target pop up with no altitude about 5 miles apart. I clicked on the target and noticed it was squawking 1202; which for us is an indicator that it is a glider. I issued traffic and turned the LJ60 to a 090 heading to avoid the maneuvering glider at 5C1. As fate may have it; the primary tracked directly in to and merged with my LJ60 on final. I was basically praying to the gods that this glider was not at 4;000 feet as I frantically issued traffic. Fortunately the LJ60 never saw the glider and landed safely. On a different date I was watching the Final Controller on APW [Approach West] work around multiple aircraft coming in and out of 5C1 squawking VFR flying through air carrier arrivals into SAT.  There was also a glider there maneuvering again with an intermittent transponder. They were flying up to 5500 feet and below; our arrivals are 6;000 feet and below. The Final Controller was issuing traffic and playing guessing games as to what these VFR aircraft; gliders; 15 miles from SAT runway final; were going to do. Extend the Class C all around 5C1 or create Class B to protect SAT finals. 5C1 has been an issue for a long time; enough is enough.
A SAT TRACON Controller reported two instances of jet aircraft on final approach to SAT conflicting with gliders maneuvering into and out of a non-towered airport (5C1) located underneath the final approach course.