Narrative:

I was descending 3-5 mi northwest of visibility with the intention of over-flying the airport at least 1000' above pattern altitude to observe the wind sock. I had been monitoring unicom frequency since approximately 20 mi northwest of the airport, and heard no xmissions from any other aircraft inbound or outbound to/from visibility. I observed what I believe was a commuter light transport Y pass directly below me, apparently climbing out in the opp direction. I had not observed any traffic on the runway, so I believe this aircraft was executing a missed approach following a practice ILS to visibility. This is a common occurrence at visibility, which is used extensively by commuter for pilot training. Usually, however, the crew makes frequent reports of their position for the benefit of other aircraft in the vicinity. I myself radioed my position and altitude when 7 mi out. After the miss I entered a left downwind for runway 30 and radioed my position in the blind. The air carrier light transport Y aircraft then responded and asked whether I had seen them pass beneath. I replied that I had indeed. They then made the statement that 'a 45 degree entry could have avoided the situation.' I replied that I was at least 1500' above pattern altitude when we passed. I then asked them if they had monitored my earlier transmission of my position, and they replied, 'we missed that.' I believe that the air carrier light transport Y did not switch over to the local frequency after the OM on the approach, or otherwise did not make the prudent reports required to keep other aircraft informed of their positions. For my part, I will in the future avoid extended centerlines within 5 mi of an airport regardless of altitude.

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Original NASA ASRS Text

Title: NMAC BETWEEN ATX FRT ACFT AND ACR LTT Y AT VIS.

Narrative: I WAS DSNDING 3-5 MI NW OF VIS WITH THE INTENTION OF OVER-FLYING THE ARPT AT LEAST 1000' ABOVE PATTERN ALT TO OBSERVE THE WIND SOCK. I HAD BEEN MONITORING UNICOM FREQ SINCE APPROX 20 MI NW OF THE ARPT, AND HEARD NO XMISSIONS FROM ANY OTHER ACFT INBND OR OUTBOUND TO/FROM VIS. I OBSERVED WHAT I BELIEVE WAS A COMMUTER LTT Y PASS DIRECTLY BELOW ME, APPARENTLY CLBING OUT IN THE OPP DIRECTION. I HAD NOT OBSERVED ANY TFC ON THE RWY, SO I BELIEVE THIS ACFT WAS EXECUTING A MISSED APCH FOLLOWING A PRACTICE ILS TO VIS. THIS IS A COMMON OCCURRENCE AT VIS, WHICH IS USED EXTENSIVELY BY COMMUTER FOR PLT TRNING. USUALLY, HOWEVER, THE CREW MAKES FREQUENT RPTS OF THEIR POS FOR THE BENEFIT OF OTHER ACFT IN THE VICINITY. I MYSELF RADIOED MY POS AND ALT WHEN 7 MI OUT. AFTER THE MISS I ENTERED A LEFT DOWNWIND FOR RWY 30 AND RADIOED MY POS IN THE BLIND. THE ACR LTT Y ACFT THEN RESPONDED AND ASKED WHETHER I HAD SEEN THEM PASS BENEATH. I REPLIED THAT I HAD INDEED. THEY THEN MADE THE STATEMENT THAT 'A 45 DEG ENTRY COULD HAVE AVOIDED THE SITUATION.' I REPLIED THAT I WAS AT LEAST 1500' ABOVE PATTERN ALT WHEN WE PASSED. I THEN ASKED THEM IF THEY HAD MONITORED MY EARLIER XMISSION OF MY POS, AND THEY REPLIED, 'WE MISSED THAT.' I BELIEVE THAT THE ACR LTT Y DID NOT SWITCH OVER TO THE LCL FREQ AFTER THE OM ON THE APCH, OR OTHERWISE DID NOT MAKE THE PRUDENT RPTS REQUIRED TO KEEP OTHER ACFT INFORMED OF THEIR POSITIONS. FOR MY PART, I WILL IN THE FUTURE AVOID EXTENDED CENTERLINES WITHIN 5 MI OF AN ARPT REGARDLESS OF ALT.

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.