NMAC. BOTH ACFT HAD BEEN ADVISED OF CONFLICTING TFC AND TO MAINTAIN VISUAL SEPARATION. BECAUSE RPTR ACFT WAS LEVEL AND THE INTRUDER WAS DSNDING INTO THEM; THE OTHER ACFT SHOULD HAVE BEEN MORE VIGILANT. INSTEAD THEY FORCED THE RPTR TO TAKE EVASIVE ACTION.

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OUR FLT WAS CLRED FROM WALLA WALLA TO MOSES LAKE. WE WERE BEING VECTORED; HDG 300 DEGS; LEVEL 10000 FT MSL; APPROX 220 KIAS; VMC. AT ABOUT 45 NM FROM MOSES LAKE; ATC ASKED IF WE HAD ACR X IN SIGHT AT 1:30 POS; 6 NM; 11000 FT. WE REPLIED THAT WE DID. ATC ASKED THE SAME OF ACR X; WHO WAS PROCEEDING NE-SW. ACR X WAS CLRED TO DSND; REF OUR ACFT. BOTH TCASII AND VISUAL SHOWED X TO BE CONVERGING. AT APPROX 4 NM; TCASII SHOWED ACR X TO BEGIN A DSCNT. WE OBSERVED ACR X TO BE ON A COLLISION COURSE WITH US; TO CROSS OUR FLT PATH AT OUR ALT. THEY REMAINED IN OUR 1:30- 2 O'CLOCK POS. I EXPECTED SOME SORT OF EVASIVE ACTION ON THEIR PART; SUCH AS LEVELING AT 500 FT ABOVE US. WE DID NOT OBSERVE ANY SUCH MOVEMENT OF THEIR ACFT. AT ABOUT 200 FT ABOVE US; AND NOW MOVING TOWARDS OUR 12 O'CLOCK POS; I MADE A RAPID ROLL TO THE R (INSIDE ACR X) AND PULLED UP. THE LAST I SAW; WE WERE CLRING CLOSE TO THEIR RUDDER AND SLIGHTLY ABOVE. WE TOPPED AT 10700 FT; THEN BEGAN A DSCNT BACK TO 10000 FT. WE INFORMED ATC OF OUR PROB AND NEED TO EVADE. IN THE PAST FEW YRS; I HAVE OBSERVED ACR X AND ONLY ACR X MAKE MAJOR MISTAKES/DEVS. THE EVENTS HAVE RANGED FROM TAXIING ONTO THE CTR OF THE RWY WHILE WE WERE LNDG IN THE OPPOSITE DIRECTION; TO MAKING MULTIPLE IMC UNANNOUNCED APCHS AT UNCTLED ARPT. I HAVE SPOKEN TO ACR B PLT WHO OBSERVED ACR X LAND OPPOSITE TO AIRBORNE TFC WHILE NOT BEING ON THE CTAF; CAUSING 1 ACFT TO MAKE A BALKED LNDG TO AVOID ACR X. ANOTHER PLT RELATED HOW AN ACR X FLT DEPARTED IMMEDIATELY BEHIND THEM; AFTER RECEIVING A HOLD FOR RELEASE CLRNC. WE FLY IN THE SAME TFC PATTERNS AS ACR B; ACR C; AND ACR D; FREIGHT CARRIERS; GA ACFT; AND OCCASIONALLY VERY SMALL ACFT USING THE STUDENT PLT CALL SIGN. YET THE ONLY CARRIER THAT SEEMS TO HAVE SAFETY RELATED PROBS IS ACR X. I FIRMLY BELIEVE THAT ACR X SHOULD NOT BE ALLOWED TO FLY INTO/FROM UNCTLED ARPTS. I ALSO BELIEVE THAT ACR X AND ONLY ACR X SHOULD NOT BE GIVEN VISUAL SEPARATION CLRNCS. I BELIEVE THAT THE FIRST ACR B MIDAIR COLLISION WILL BE WITH ACR X AT AN UNCTLED ARPT. I HAVE SEEN AND HEARD OF TOO MANY EVENTS THAT INDICATE THAT ACR X DOES NOT UNDERSTAND THE UNCTLED AIRSPACE FLT ENVIRONMENT. I CANNOT SAY IF THE NMAC OF THIS RPT WAS DUE TO ACR X INTENTIONALLY ATTEMPTING TO MAKE A CLOSE PASS AND THEY LOST CTL OF THE SIT; OR IF THEY JUST DID NOT HAVE THE SKILL TO FLY IN A SAFE MANNER. WHATEVER THE PROB; THEY ARE NOT SAFE. I OPT FOR THE FENCE ON THE HILL; NOT THE AMBULANCE IN THE VALLEY. STOP ACR X BEFORE THEY KILL.