Narrative:

During our initial approach to sat; descending via the lemig 1 arrival; ATC issued us an amendment to our altitude to be maintained (first we were assigned 10;000 ft then 11;000); that was due to traffic (small aircraft). When we leveled off at 11;000 ft first we had a TA; followed by a RA to level off. We executed the procedure as prescribed; it just took a couple of seconds. We didn't notify ATC of the conflict because we were out of it (the RA commanded us to level off; the traffic seemed not to be able to keep the altitude very well; it was like 400 ft below us). As additional information the autopilot was engaged. The rest of the flight continued without any further incident. One of the contributing factors I think was that ATC was a little bit busy managing other traffic; also the lack of precision from the small aircraft pilot to maintain the altitude as assigned.

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Original NASA ASRS Text

Title: A320 First Officer describes a TCAS RA descending into SAT at 11;000 FT. Leveling off was the required action to avoid a VFR small aircraft.

Narrative: During our initial approach to SAT; descending via the LEMIG 1 arrival; ATC issued us an amendment to our altitude to be maintained (first we were assigned 10;000 FT then 11;000); that was due to traffic (small aircraft). When we leveled off at 11;000 FT first we had a TA; followed by a RA to level off. We executed the procedure as prescribed; it just took a couple of seconds. We didn't notify ATC of the conflict because we were out of it (the RA commanded us to level off; the traffic seemed not to be able to keep the altitude very well; it was like 400 FT below us). As additional information the autopilot was engaged. The rest of the flight continued without any further incident. One of the contributing factors I think was that ATC was a little bit busy managing other traffic; also the lack of precision from the small aircraft pilot to maintain the altitude as assigned.

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.