Narrative:

While acting as first officer (PNF) on air carrier X slc-cdc on jul/xa/99 at XA25, on approach to landing runway 20, our aircraft had a near miss with an ultralight aircraft which turned in front of us. On the missed approach/go around, we had a near miss with another light private aircraft which was in the pattern. Factors leading to situation include: the ultralight which pulled in front of us made no radio calls, and was transmitting on the wrong frequency (per my conversation with his afterwards). I also don't believe he was looking for traffic before he made the turn in front of us. On the go around, we got a traffic alert TCASII indicating an aircraft 200 ft high. When the captain descended, the other aircraft made a radio call that we were descending onto him. At that time we climbed, avoiding contact. The incorrect TCASII information almost led to a midair due to the fact that we had no visual. I feel that this situation could have been avoided had the ultralight pilot transmitted his intentions on the correct frequency. We would have gone around sooner and been able to better maintain separation from both aircraft. Note: the pilot of the ultralight was using what appeared to be a xerox copy of an outdated sectional chart, which is where he obtained the wrong CTAF of 122.95 rather than 123.6 which he should have been using.

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Original NASA ASRS Text

Title: EMB120 FLC AVOIDS NMAC WITH ULTRALIGHT AND RECEIVES TCASII RA FOR ANOTHER ACFT IN TFC PATTERN.

Narrative: WHILE ACTING AS FO (PNF) ON ACR X SLC-CDC ON JUL/XA/99 AT XA25, ON APCH TO LNDG RWY 20, OUR ACFT HAD A NEAR MISS WITH AN ULTRALIGHT ACFT WHICH TURNED IN FRONT OF US. ON THE MISSED APCH/GAR, WE HAD A NEAR MISS WITH ANOTHER LIGHT PVT ACFT WHICH WAS IN THE PATTERN. FACTORS LEADING TO SIT INCLUDE: THE ULTRALIGHT WHICH PULLED IN FRONT OF US MADE NO RADIO CALLS, AND WAS XMITTING ON THE WRONG FREQ (PER MY CONVERSATION WITH HIS AFTERWARDS). I ALSO DON'T BELIEVE HE WAS LOOKING FOR TFC BEFORE HE MADE THE TURN IN FRONT OF US. ON THE GAR, WE GOT A TFC ALERT TCASII INDICATING AN ACFT 200 FT HIGH. WHEN THE CAPT DSNDED, THE OTHER ACFT MADE A RADIO CALL THAT WE WERE DSNDING ONTO HIM. AT THAT TIME WE CLBED, AVOIDING CONTACT. THE INCORRECT TCASII INFO ALMOST LED TO A MIDAIR DUE TO THE FACT THAT WE HAD NO VISUAL. I FEEL THAT THIS SIT COULD HAVE BEEN AVOIDED HAD THE ULTRALIGHT PLT XMITTED HIS INTENTIONS ON THE CORRECT FREQ. WE WOULD HAVE GONE AROUND SOONER AND BEEN ABLE TO BETTER MAINTAIN SEPARATION FROM BOTH ACFT. NOTE: THE PLT OF THE ULTRALIGHT WAS USING WHAT APPEARED TO BE A XEROX COPY OF AN OUTDATED SECTIONAL CHART, WHICH IS WHERE HE OBTAINED THE WRONG CTAF OF 122.95 RATHER THAN 123.6 WHICH HE SHOULD HAVE BEEN USING.

Data retrieved from NASA's ASRS site as of July 2007 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.