Narrative:

We were coming into clt talking to approach control. The controller told us to turn to a heading of 030 degrees to intercept the 36L localizer. We turned as instructed. As we were on the 030 heading my first officer noticed a gulfstream aircraft coming towards us on the right. My first officer told me that he was not turning to intercept the 36C localizer and that he was getting closer and closer to us. I told him to keep and eye on him. We then got a traffic advisory from the TCAS and we advised ATC. After that my first officer told me that he was not turning and he is getting to close to us. Our autopilot then starts the left hand turn to intercept the 36L localizer when we got a red RA on our TCAS and it was commanding us to descend. I disconnected the autopilot and banked the aircraft even more into a 45 degree bank and pushed forward on the controls to start a descent to keep this gulfstream from hitting us. As we were in the maneuver ATC tells us that there is an aircraft that flew through the 36C localizer and was coming towards us. I then told my first officer to tell ATC on the radio that we are responding to an RA at this time. I looked out the right window and I saw the gulfstream in a turn to 50 degrees or even possibly more to the right to keep from hitting us. ATC then told us that they are going to vector the gulfstream to runway 36R. After we were clear of the conflict I rolled wings level and pitched back up to climb back up to 3;000 feet. I then turned the aircraft right and regained the localizer for 36L and conducted a standard approach and landed safely on 36L with no injuries. I think ATC should have told us sooner about this other aircraft coming towards us. We or he should have been given instructions to climb and break off of the approach due to a possible traffic conflict.

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Original NASA ASRS Text

Title: CRJ-200 Captain experiences a NMAC with a business jet while on vectors to intercept Runway 36L localizer. The business jet on vectors to intercept Runway 36C localizer overshot intruding into 36L. TCAS announced the developing conflict and issued a descend RA.

Narrative: We were coming into CLT talking to Approach Control. The Controller told us to turn to a heading of 030 degrees to intercept the 36L localizer. We turned as instructed. As we were on the 030 heading my First Officer noticed a Gulfstream aircraft coming towards us on the right. My First Officer told me that he was not turning to intercept the 36C localizer and that he was getting closer and closer to us. I told him to keep and eye on him. We then got a traffic advisory from the TCAS and we advised ATC. After that my First Officer told me that he was not turning and he is getting to close to us. Our autopilot then starts the left hand turn to intercept the 36L localizer when we got a red RA on our TCAS and it was commanding us to descend. I disconnected the autopilot and banked the aircraft even more into a 45 degree bank and pushed forward on the controls to start a descent to keep this Gulfstream from hitting us. As we were in the maneuver ATC tells us that there is an aircraft that flew through the 36C Localizer and was coming towards us. I then told my First Officer to tell ATC on the radio that we are responding to an RA at this time. I looked out the right window and I saw the Gulfstream in a turn to 50 degrees or even possibly more to the right to keep from hitting us. ATC then told us that they are going to vector the Gulfstream to Runway 36R. After we were clear of the conflict I rolled wings level and pitched back up to climb back up to 3;000 feet. I then turned the aircraft right and regained the localizer for 36L and conducted a standard approach and landed safely on 36L with no injuries. I think ATC should have told us sooner about this other aircraft coming towards us. We or he should have been given instructions to climb and break off of the approach due to a possible traffic conflict.

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.