Narrative:

On jul/mon/89, I was #2 for the ILS into dubois. At 1000' above decision height we were informed by ZOB there was a VFR target 2 mi southeast of the airport. At 500' AGL that aircraft was spotted just as we broke out of the overcast. I then made a sharp right climbing turn back into the overcast. The other aircraft came within 100-200' of us. Cleveland tracked him to clarion airport. He should not have been there the WX was 500' and 1 1/2. Supplemental information from acn 118763: upon approaching dubois jefferson co PA airport from the west along the highway I called on 123.0 from about 8 mi out and received no response. I called about 3 times before turning left toward the airport and called again with no response. Upon approach I sighted a twin engine short aircraft just off the east end of the runway approaching to land. He passed about 300' under me and aborted his landing with a slight 10 degree turn to the right. Flight service then called me on 123.0 and told me to contact them on 123.6. I called them and they told me that they were IFR and to land or leave the area. I advised them that I would return to clarion co airport. Upon leaving the area flight service requested that I call them after landing. I called and discussed the situation with them. I was told that I should have called on 123.6 and that an aborted landing would be reported. I was asked to identify myself, which I did. I was told that this situation happens often which prompted this notice to you. It is my feeling that if flight service monitored the 123.0 frequency under IFR conditions this situation I find myself a part of could be avoided. Perhaps the flight service frequency 123.6 should be listed under the airport identification on the chart along with the 123.0. It would have saved me my error.

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Original NASA ASRS Text

Title: NMAC BETWEEN AN IFR LTT AND A NORAC SMA IN CTL ZONE DURING IMC CONDITIONS. NON TWR ARPT WITH CTAF FSS. ALERT ARTCC RADAR CTLR GAVE ADVISORY THAT ALERTED FLT CREW OF LTT. ABORTED APCH RESULTED WHEN TRAFFIC SIGHTED BY LTT CREW. THE CENTER DID NOT TURN LTT OVER TO FSS DUE TO TRAFFIC ADVISORY. UNDER NORMAL CONDITIONS BOTH ACFT WOULD OR SHOULD HAVE BEEN ON FSS FREQ FOR TRAFFIC.

Narrative: ON JUL/MON/89, I WAS #2 FOR THE ILS INTO DUBOIS. AT 1000' ABOVE DECISION HEIGHT WE WERE INFORMED BY ZOB THERE WAS A VFR TARGET 2 MI SE OF THE ARPT. AT 500' AGL THAT ACFT WAS SPOTTED JUST AS WE BROKE OUT OF THE OVERCAST. I THEN MADE A SHARP RIGHT CLIMBING TURN BACK INTO THE OVERCAST. THE OTHER ACFT CAME WITHIN 100-200' OF US. CLEVELAND TRACKED HIM TO CLARION ARPT. HE SHOULD NOT HAVE BEEN THERE THE WX WAS 500' AND 1 1/2. SUPPLEMENTAL INFORMATION FROM ACN 118763: UPON APCHING DUBOIS JEFFERSON CO PA ARPT FROM THE W ALONG THE HWY I CALLED ON 123.0 FROM ABOUT 8 MI OUT AND RECEIVED NO RESPONSE. I CALLED ABOUT 3 TIMES BEFORE TURNING LEFT TOWARD THE ARPT AND CALLED AGAIN WITH NO RESPONSE. UPON APCH I SIGHTED A TWIN ENG SHORT ACFT JUST OFF THE E END OF THE RWY APCHING TO LAND. HE PASSED ABOUT 300' UNDER ME AND ABORTED HIS LNDG WITH A SLIGHT 10 DEG TURN TO THE RIGHT. FLT SERVICE THEN CALLED ME ON 123.0 AND TOLD ME TO CONTACT THEM ON 123.6. I CALLED THEM AND THEY TOLD ME THAT THEY WERE IFR AND TO LAND OR LEAVE THE AREA. I ADVISED THEM THAT I WOULD RETURN TO CLARION CO ARPT. UPON LEAVING THE AREA FLT SERVICE REQUESTED THAT I CALL THEM AFTER LNDG. I CALLED AND DISCUSSED THE SITUATION WITH THEM. I WAS TOLD THAT I SHOULD HAVE CALLED ON 123.6 AND THAT AN ABORTED LNDG WOULD BE REPORTED. I WAS ASKED TO IDENTIFY MYSELF, WHICH I DID. I WAS TOLD THAT THIS SITUATION HAPPENS OFTEN WHICH PROMPTED THIS NOTICE TO YOU. IT IS MY FEELING THAT IF FLT SERVICE MONITORED THE 123.0 FREQ UNDER IFR CONDITIONS THIS SITUATION I FIND MYSELF A PART OF COULD BE AVOIDED. PERHAPS THE FLT SERVICE FREQ 123.6 SHOULD BE LISTED UNDER THE ARPT IDENTIFICATION ON THE CHART ALONG WITH THE 123.0. IT WOULD HAVE SAVED ME MY ERROR.

Data retrieved from NASA's ASRS site as of August 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.