PC-12
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 8
Situational Awareness; Human-Machine Interface
Conflict NMAC
Air Traffic Control Issued New Clearance; Air Traffic Control Separated Traffic; Flight Crew Took Evasive Action
Airspace Structure; Human Factors; Procedure
Aircraft X was inbound to Laredo airport direct IAF OVOSE on the RNV 18R at LRD. The aircraft was cleared to maintain 030 ft until established and cleared for the approach. About 5 miles from OVOSE; my trainee saw traffic with a beacon XXXX maneuvering in the area of OVOSE at 018 and called traffic to Aircraft X. He said targets appear likely to merge. At that point the XXXX code turned [towards] Aircraft X and climbed rapidly to 031. I then canceled the approach clearance of Aircraft X and turned the aircraft 30 degrees right and issued a traffic alert. Aircraft X then called the unknown Aircraft Y in sight; and said that it was a close one. At that point I asked Aircraft X if they were time critical; and when learning they were not; I extended the aircraft vectors to make sure the unknown code XXXX would not be an issue again. Laredo tower was not in communication with Aircraft Y; and when he finally did go to Laredo to land; I had the tower give that aircraft our phone number to call. Aircraft X company called the supervisor and told him that Aircraft Y was less than 200 ft from him same altitude; and that the pilot didn't see Aircraft Y until he started the turn and banked away from it.I strongly insist that if there are border aircraft near or in the vicinity of LRD; that they monitor the frequency and let us know they are there. That way this situation won't happen.
I was cleared direct JINSA on the RNAV 18R approach. I was 3 miles from the fix when Houston Center gave me a traffic advisory for an unknown target 1500 ft below me. I was looking for traffic but never got them in sight visually. I did have them on the TCAS system. Then Center advised me they were climbing rapidly toward my current altitude. I was then told that we were on a collision course and to make an immediate right-hand turn 30 degrees. Half-way through the turn is where I noticed the aircraft off my wingtip on the left side 300 ft or closer.
Houston Center Controller and an Air Taxi reported a NMAC with an aircraft not communicating with ATC.