SMT X NON ADHERENCE TO ATC INSTRUCTION OF MAINTAIN VISUAL SEPARATION. HAD NMAC WITH ACR Y. SEE AND AVOID CONCEPT. PLTDEV.

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LIFEGUARD SMT X WAS CLRED FOR TKOF RWY 21 AT ABQ ARPT WITH INSTRUCTIONS TO TURN R HDG 310. ACR Y WAS ON THE DOWNWIND FOR RWY 8 VISUAL APCH. ACR Y TURNED A 3 MI R BASE. SMT X WAS ISSUED TFC AND RPTED THE ACR Y IN SIGHT AND WAS TOLD TO MAINTAIN VISUAL SEPARATION. THE SMT X CONTINUED R TURN AND LOST SIGHT OF ACR Y IN THE TURN. TFC WAS ISSUED TO ACR Y. ACR Y FINALLY SAW THE SMT X AND BOTH TOOK EVASIVE ACTION TO AVOID THE OTHER; THEN LANDED; AND THE SMT X CONTINUED ON TO THEIR DEST. THE REASONS I BELIEVE THIS HAPPENED WAS 1) SMT X LOST SIGHT OF ACR Y AND DID NOT ADVISE ATC. 2) THE CTLR PUT THE SMT X IN A BAD SIT BY ISSUING THE R TURN. SHOULD HAVE ISSUED A HDG TO PASS BEHIND ACR Y. SUPPLEMENTAL INFO FROM ACN 243536: SMT Y DEPARTED RWY 21 WITH A CLBING R TURN TO 310 DEGS TO INTERCEPT ABQ 340 DEG RADIAL. PASSING THROUGH APPROX 240 DEG HDG; ACR Y WAS POINTED OUT AT 11 O'CLOCK POS -- (I ACKNOWLEDGED 'IN SIGHT' AND WAS TOLD TO MAINTAIN 'VISUAL SEPARATION'). ACR Y WAS; IN MY OPINION; NOT A THREAT; SO I CONTINUED A CLBING TURN AND ROLLED OUT AT APPROX 300 DEG HDG TO CHK FOR TFC. ON ROLLOUT TO WINGS LEVEL; I SAW ACR Y AT 4 O'CLOCK AND THE SAME ALT OVERTAKING ME AND APPEARED TO BE STARTING A SLIGHT R WING LOW ATTITUDE. I BANKED HARD R AND SAW THE R WING OF THE ACR Y COME UP AS IF HE WERE MAKING A HARD L TURN. I WAS ON APCH FREQ 127.4 MHZ AND THE ACR Y MUST HAVE BEEN ON TWR 118.3 MHZ