Narrative:

While in the descent approach had cleared us from 5;000 ft to 4;000 ft. As we left 5;000 ft the controller informed us of GA traffic in our area. We saw the aircraft in question visually as well as on TCAS and it would have been fairly close but not an issue. Passing approximately 4;500 ft the GA aircraft suddenly turned directly into our flight path which triggered a TCAS RA climb. We climbed approximately 300 ft until TCAS advised clear of traffic; then informed ATC what we had done and continued our descent back to 4;000 ft with no further issues.GA aircraft are a common annoyance and threat in this area. The GA pilots need to be more alert of their surroundings and action should be taken against them when they cause issues such as this with other aircraft; particularly commercial aviation.

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Original NASA ASRS Text

Title: An EMB-145 flight crew experienced a close encounter with a light aircraft and complied with a TCAS RA while descending in contact with Approach Control.

Narrative: While in the descent Approach had cleared us from 5;000 FT to 4;000 FT. As we left 5;000 FT the Controller informed us of GA traffic in our area. We saw the aircraft in question visually as well as on TCAS and it would have been fairly close but not an issue. Passing approximately 4;500 FT the GA aircraft suddenly turned directly into our flight path which triggered a TCAS RA climb. We climbed approximately 300 FT until TCAS advised clear of traffic; then informed ATC what we had done and continued our descent back to 4;000 FT with no further issues.GA aircraft are a common annoyance and threat in this area. The GA pilots need to be more alert of their surroundings and action should be taken against them when they cause issues such as this with other aircraft; particularly commercial aviation.

Data retrieved from NASA's ASRS site as of July 2013 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.