ATC EQUIP PROB RADAR ASR-9.

Narrative

WHILE RUNNING SIMULTANEOUS APCHS TO RWYS 34L AND 34R; ACR X; A CL65; AND ACR Y; A B737; WERE ON PARALLEL FINALS. NEAR POINT AT THE MOUNTAIN; X OVERTOOK Y WHEN BOTH ACFT WERE AT 10000 FT MSL. THE RADAR (ASR 9) MERGED TARGETS FOR 1 TO 2 SWEEPS AND THEN RETURNED THEM TO THEIR ACTUAL POSITIONS ESTABLISHED ON SEPARATE LOCALIZERS. THERE WAS NO TIME TO BREAK EITHER ACFT OUT AND IN ALL ACTUALITY NEITHER ACFT DEVIATED FROM THE LOC. A FEW MOMENTS LATER A HVY JET ALSO PASSED AN ACFT IN THE SAME LOCATION. THE ACFT BEING PASSED STAYED ON ITS COURSE BUT FOR 1 OR 2 SWEEPS THERE WAS NO RADAR RETURN ON THE HVY JET. THERE HAVE ALSO BEEN MANY TARGETS 'JUMPING' ON THESE FINAL APCH COURSES. THE TARGET JUMPING HAS BEEN AN ONGOING PROB WITH THE ASR 9 AT SALT LAKE APCH; BUT NOW THAT WE ARE RUNNING SIMULTANEOUS APCHS IT PRESENTS A NEW PROB. THE RADAR IS SEVERELY LIMITING THE CTLR'S ABILITY TO RUN SIMULTANEOUS APCHS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: FACILITY SUPVR STATED THEY ARE AWARE OF THE RADAR PROB WHICH IS CALLED STITCHING. SIMULTANEOUS APCH PROCS HAVE BEEN TERMINATED. MAINT TOLD SUPVR THEY HAVE A FIX FOR THE PROB WHICH WILL BE INSTALLED SHORTLY.