NMAC IN THE TFC PATTERN AT A NON TWR ARPT DURING A DUSK OP.

Narrative

ACFT #1 WAS APCHING W54 TO LAND; AND HAD RADIOED ENTERING R DOWNWIND FOR RWY 34; IN PARTICULAR ENTERING LONG DOWNWIND. A LISTENING WATCH ON CTAF INDICATED NO ACFT IN THE PATTERN OR ABOUT TO ENTER IT OR OPERATING AT THE ARPT. VISUAL WATCH ALSO INDICATED NO ACFT IN THE PATTERN. WHEN ABEAM THE DEP END OF RWY 34; ACFT #1 NOTICED ACFT #2 FLYING XWIND LEG ON A CLOSED PATTERN; CLBING OUT. ACFT #2 WAS CLBING; ABOUT 200 FT BELOW AND 200 FT TO STARBOARD OF ACFT #1. ACFT #1 HAD PULSING LNDG/TAXI LIGHTS IN OP; AS WELL AS FULL STROBES AND NAV LIGHTS. ACFT #2 HAD A LNDG LIGHT AND A RED BEACON; BUT NO STROBES OR NAV LIGHTS. ACFT #1 KEPT A WATCH ON ACFT #2 AS IT CROSSED BEHIND ACFT #1 AND TURNED DOWNWIND; OFF THE PORT WING OF ACFT #1. ACFT #1 SENSED NO EVASIVE ACTION ON THE PART OF ACFT #2; SO ACFT #1 ADDED PWR AND CLBED OUT OF THE PATTERN; LATER RETURNING TO LAND. ALTHOUGH ACFT #2 WAS HEARD BY ACFT #1 AS BROADCASTING TURNING TO FINAL; NO OTHER BROADCASTS FROM ACFT #2 WERE HEARD BY ACFT #1. ACFT #1 CALLED ACFT #2 ON THE GND AND ASKED IF HE COULD HEAR ACFT #1'S RADIO; TO WHICH ACFT #2 RESPONDED IN THE AFFIRMATIVE. THIS STRESSES IMPORTANCE OF USE OF CTAF; NEED TO CHK FOR TFC ON RWY BEFORE ENTERING DOWNWIND; AND IMPORTANCE OF STROBES ON ALL ACFT AT DUSK.