Narrative:

I was working the final position and we were in simultaneous ILS approach airspace. A CRJ2 was level in the downwind at 090 per our SOP and needed to fly another 5 miles or so before I could base the aircraft. Slc was reporting marginal VFR conditions but we had been on ILS approaches all day. I had noted low level VFR traffic earlier (at 5;800 ft) and thought that maybe conditions were improving somewhat; as bases had previously been reported just below 6;000 ft. I had two other aircraft that I needed to get turned in and cleared for the ILS approach; which I was just finishing up when the ca went off for the CRJ2 and a then VFR aircraft squawking 1200 that I was not talking to. The VFR aircraft had climbed into bravo airspace without establishing radio communications and receiving a clearance and was showing level at 8;500 ft; about a mile and a half to the southeast of the rj; level at 9;000 ft. I issued a traffic alert to the CRJ2 and the pilot advised 'we are looking; we are descending now for an RA; and we got him in sight.' I asked the rj if 8;500 ft was a good altitude on the aircraft because I thought it was a little strange that the TCAS issued a descent. The pilot said it was and descended to 8;100 ft in an 8;500 ft MVA. When I observed the rj passing 8;300 ft I issued a low altitude alert to the aircraft. The pilot replied; 'roger; we are climbing; we have the terrain in sight.' I advised the pilot to maintain their own terrain/obstruction clearance; and when able maintain 9;000. Shortly after passing the rj; the pilot of the VFR aircraft (a BE35) called up for services. I told him that he needed a bravo clearance before entering the airspace to which he replied that he was sorry and was trying to remain clear of clouds. I issued a brasher warning to the pilot of the BE35. This pilot; and more broadly; general aviation pilots; need to understand the different rules for different classes of airspace.

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Original NASA ASRS Text

Title: S56 Controller reported a TCAS RA event by an IFR CRJ arrival into SLC when a VFR aircraft entered Class B without clearance; reportedly because of cloud avoidance maneuvering.

Narrative: I was working the Final position and we were in simultaneous ILS approach airspace. A CRJ2 was level in the downwind at 090 per our SOP and needed to fly another 5 miles or so before I could base the aircraft. SLC was reporting marginal VFR conditions but we had been on ILS approaches all day. I had noted low level VFR traffic earlier (at 5;800 FT) and thought that maybe conditions were improving somewhat; as bases had previously been reported just below 6;000 FT. I had two other aircraft that I needed to get turned in and cleared for the ILS approach; which I was just finishing up when the CA went off for the CRJ2 and a then VFR aircraft squawking 1200 that I was not talking to. The VFR aircraft had climbed into Bravo airspace without establishing radio communications and receiving a clearance and was showing level at 8;500 FT; about a mile and a half to the southeast of the RJ; level at 9;000 FT. I issued a traffic alert to the CRJ2 and the pilot advised 'we are looking; we are descending now for an RA; and we got him in sight.' I asked the RJ if 8;500 FT was a good altitude on the aircraft because I thought it was a little strange that the TCAS issued a descent. The pilot said it was and descended to 8;100 FT in an 8;500 FT MVA. When I observed the RJ passing 8;300 FT I issued a Low Altitude Alert to the aircraft. The pilot replied; 'Roger; we are climbing; we have the terrain in sight.' I advised the pilot to maintain their own terrain/obstruction clearance; and when able maintain 9;000. Shortly after passing the RJ; the pilot of the VFR aircraft (a BE35) called up for services. I told him that he needed a Bravo clearance before entering the airspace to which he replied that he was sorry and was trying to remain clear of clouds. I issued a brasher warning to the pilot of the BE35. This pilot; and more broadly; general aviation pilots; need to understand the different rules for different classes of airspace.

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.