Sat approach controller reported a B737 on final approach received an RA for unidentified VFR traffi...

Attributes
ACN	1543194
Time
Date	201805
Local Time Of Day	1201-1800
Place
Locale Reference	SAT.TRACON
State Reference	TX
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft Low Wing 1 Eng Retractable Gear
Flight Phase	Climb
Flight Plan	VFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 6
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict

Narrative:

Aircraft X was on a vector to join final. I observed traffic depart 5c1 airport which is located on the final to sat 13R. The target departed initially to the west and initially appeared to be no factor; but later turned to the north cutting off aircraft X causing an RA for aircraft X. The aircraft later called and requested an IFR pickup and reported the B737 in sight.sat needs a modification to the airspace to prevent this type of operation. This is a daily occurrence while working final to sat. 5c1 airport has a variety of aircraft from light sport all the way up to learjets as well as a large number of gliders. The airport is situated 15 miles northwest of the airport right on the final to the most commonly used runway at sat. Due to the location of this airport and the proximity to the final approach course to sat it is common practice to have to break aircraft off of the approach to sat to be re-sequenced due to unidentified traffic maneuvering on the localizer to 13R.

Original NASA ASRS Text

Title: SAT Approach Controller reported a B737 on final approach received an RA for unidentified VFR traffic departing an adjacent satellite airport.

Narrative: Aircraft X was on a vector to join final. I observed traffic depart 5C1 airport which is located on the final to SAT 13R. The target departed initially to the west and initially appeared to be no factor; but later turned to the north cutting off Aircraft X causing an RA for Aircraft X. The aircraft later called and requested an IFR pickup and reported the B737 in sight.SAT needs a modification to the airspace to prevent this type of operation. This is a daily occurrence while working final to SAT. 5C1 airport has a variety of aircraft from light sport all the way up to Learjets as well as a large number of gliders. The airport is situated 15 miles northwest of the airport right on the final to the most commonly used runway at SAT. Due to the location of this airport and the proximity to the final approach course to SAT it is common practice to have to break aircraft off of the approach to SAT to be re-sequenced due to unidentified traffic maneuvering on the localizer to 13R.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Sat approach controller reported a B737 on final approach received an RA for unidentified VFR traffic departing an adjacent satellite airport.