NMAC AT NON TWR ARPT BTWN 2 LTT'S. ARR TFC.

Narrative

THE ACR Y FLT NORMALLY ARRIVES AT IYK WELL IN ADVANCE OF OUR ACR X FLT. THIS DAY ACR Y WAS APPROX 5 MINS IN FRONT OF US. WHEN WE WERE OVER PMD VORTAC; ACR Y WAS PAST MOHAVE ENRTE TO IYK. AT THAT TIME ACR Y TOLD JOSHUA APCH THEY HAD IYK ARPT IN SIGHT BUT WOULD ENTER THE ARPT FROM THE N INSTEAD OF THE NORMAL S ENTRY. THIS SURPRISED US. AT 30 MI S OF IYK WE TERMINATED RADAR SVC WITH JOSHUA APCH AND TUNED TO IYK CTAF. WE MADE POS RPTS ON IYK CTAF AT 20; 15; 10; AND 5 MI OUT REQUESTING OTHER TFC TO MAKE THEMSELVES KNOWN. NO ONE RESPONDED. WE ENTERED THE ARPT FROM THE S MAKING L TFC TO RWY 20 AS PER THE AFD. UPON ENTERING L DOWNWIND TO RWY 20 WE NOTICED ACR Y WAS NOT ON THE RAMP AS WE EXPECTED. WE CONTINUED TO LNDG WITH STANDARD RADIO CALLS ON DOWNWIND; BASE; AND FINAL. ACR Y ARRIVED AS WE WALKED INTO THE TERMINAL. INSIDE THE TERMINAL AN ACR Y PAX CONFRONTED THE ACR X CAPT. APPARENTLY; ACR Y TOOK EVASIVE ACTION TO AVOID HITTING US ON SHORT FINAL. WE WERE COMPLETELY UNAWARE OF ANY PROB. OUR ACR X AGENT SAID ACR Y ENTERED FROM THE NW ON A R BASE TO RWY 20 CONTRARY TO AFD. SHE SAID ACR Y WENT NEARLY INVERTED TO AVOID US. STATION PERSONNEL SAID THE ACR Y CAPT LATER SAID HE WAS ON JOSHUA APCH FREQ UNTIL TURNING FINAL. THEY ALSO SAID ACR Z; A FORMER OPERATOR; HAD OFTEN COMPLAINED OF ACR Y MAKING R TFC CONTRARY TO AFD. THIS INCIDENT SHOULD NEVER HAVE OCCURRED. ACR Y SHOULD HAVE BEEN ON THE GND AND SHOULD HAVE MADE RADIO CALLS. WE DON'T KNOW WHY ACR Y ENTERED FROM THE NW AS THIS WAS OUT OF THE WAY.