Narrative:

While on an instrument training flight in VMC with a student, I contacted new york approach to request the ILS 36 into waterbury oxford airport, low approach only. ATC reported he would be unable to provide radar coverage but advised we could shoot the approach on our own using the CTAF. I responded that we would continue using the CTAF but would also stick with new york for any advisories he could provide. This conversation took place while my student and I cruised at 2500 ft direct to clera LOM from meriden markham (mmk). I called on the CTAF to advise local traffic of our position and altitude as well as our intention of shooting the approach. Upon reaching the LOM, my student raised his left wing so I could clear the area. Seeing no traffic, I cleared him to turn into the hold entry for course reversal. Once in our standard rate turn, I saw a white small aircraft with red stripes almost directly below us. No evasive action was needed as the turn was taking us away from the lower traffic. It appeared he had been coming from our 7-8 O'clock position. The other small aircraft held his course and altitude and continued on to the west until he was out of sight. I can only assume he never saw us and was unaware of our close proximity. The only causes I can imagine in this instance were a combination of a poor scan by the lower aircraft as he overtook my own, and his apparent lack of knowledge of our position due to not monitoring the local radio frequency. While oxc is an uncontrolled airport, not requiring radios, I think a heightened vigilance would be appropriate if a pilot opts to fly through the area surrounding an airport of this size and with as much traffic as is in the air on a regular basis. It would also be helpful if radar coverage was available at the altitudes light aircraft are likely to be flying the approachs at.

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Original NASA ASRS Text

Title: 2 SMAS HAD AN NMAC OVER AN OM.

Narrative: WHILE ON AN INST TRAINING FLT IN VMC WITH A STUDENT, I CONTACTED NEW YORK APCH TO REQUEST THE ILS 36 INTO WATERBURY OXFORD ARPT, LOW APCH ONLY. ATC RPTED HE WOULD BE UNABLE TO PROVIDE RADAR COVERAGE BUT ADVISED WE COULD SHOOT THE APCH ON OUR OWN USING THE CTAF. I RESPONDED THAT WE WOULD CONTINUE USING THE CTAF BUT WOULD ALSO STICK WITH NEW YORK FOR ANY ADVISORIES HE COULD PROVIDE. THIS CONVERSATION TOOK PLACE WHILE MY STUDENT AND I CRUISED AT 2500 FT DIRECT TO CLERA LOM FROM MERIDEN MARKHAM (MMK). I CALLED ON THE CTAF TO ADVISE LCL TFC OF OUR POS AND ALT AS WELL AS OUR INTENTION OF SHOOTING THE APCH. UPON REACHING THE LOM, MY STUDENT RAISED HIS L WING SO I COULD CLR THE AREA. SEEING NO TFC, I CLRED HIM TO TURN INTO THE HOLD ENTRY FOR COURSE REVERSAL. ONCE IN OUR STANDARD RATE TURN, I SAW A WHITE SMA WITH RED STRIPES ALMOST DIRECTLY BELOW US. NO EVASIVE ACTION WAS NEEDED AS THE TURN WAS TAKING US AWAY FROM THE LOWER TFC. IT APPEARED HE HAD BEEN COMING FROM OUR 7-8 O'CLOCK POS. THE OTHER SMA HELD HIS COURSE AND ALT AND CONTINUED ON TO THE W UNTIL HE WAS OUT OF SIGHT. I CAN ONLY ASSUME HE NEVER SAW US AND WAS UNAWARE OF OUR CLOSE PROX. THE ONLY CAUSES I CAN IMAGINE IN THIS INSTANCE WERE A COMBINATION OF A POOR SCAN BY THE LOWER ACFT AS HE OVERTOOK MY OWN, AND HIS APPARENT LACK OF KNOWLEDGE OF OUR POS DUE TO NOT MONITORING THE LCL RADIO FREQ. WHILE OXC IS AN UNCTLED ARPT, NOT REQUIRING RADIOS, I THINK A HEIGHTENED VIGILANCE WOULD BE APPROPRIATE IF A PLT OPTS TO FLY THROUGH THE AREA SURROUNDING AN ARPT OF THIS SIZE AND WITH AS MUCH TFC AS IS IN THE AIR ON A REGULAR BASIS. IT WOULD ALSO BE HELPFUL IF RADAR COVERAGE WAS AVAILABLE AT THE ALTS LIGHT ACFT ARE LIKELY TO BE FLYING THE APCHS AT.

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.