ARTCC RADAR CTLR COMPLAINS THAT AIRBUS ACFT ROUTINELY TURN BEFORE REACHING A FIX INSTEAD OF PASSING OVER THE FIX BEFORE MAKING A TURN; CAUSING INCREASING WORKLOAD TO PREVENT TFC CONFLICTS.

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TODAY WHILE WORKING R40 AT APPROX XA:20Z I HAD AN UNSAFE SIT OCCUR WITH ACR X A319. AIRBUS PLTS ARE NAVIGATING WITHOUT THEIR EQUIP PLACED IN THE OVER FLT MODE WITH INCREASING REGULARITY. ACR X WAS CLBING SLOWLY TO FL330 VIA TRM THEN EED. ACR Y WAS WESTBOUND ON J212 DSNDING OUT OF FL310 FOR FL280. ACR X BEGAN AN EARLY TURN TOWARD EED APPROX 2 TO 3 NM W OF TRM. THIS TURN PLACED THE ACFT IN THE PROXIMITY ACR Y THIS SIT SHOULD NEVER OCCUR AND AN FAA DIRECTIVE SHOULD BE ISSUED TO AIRBUS ACFT TO UTILIZE THE OVER-FLT NAVIGATION MODE ONLY. SECTOR 40 AT ZLA CANNOT SAFELY ACCOMMODATE ACFT NAVIGATION EQUIP THAT ALLOWS ACFT TO MAKE EARLY TURNS AT THEIR POINTS OF NAVIGATION. THIS SECTOR IS TOO BUSY AND COMPLEX FOR SUCH SITS. CTLRS SHOULD NOT BE REQUIRED TO INSTRUCT EVERY PLT OF AIRBUS MODEL ACFT ON FREQUENCY; TO OVER-FLY THE FIXES LISTED IN THEIR FLT PLANS. IT CONSUMES TOO MUCH TIME AND IS DISTRACTING. LOS ANGELES ARTCC IS CURRENTLY SEEKING METHODS TO REDUCE COMPLEXITY AND ENHANCE SAFETY FOR OUR AIR TRAFFIC OPS. CTLRS ARE AWARE OF THIS SIT WITH AIRBUS ACFT AND HAVE BEEN WORKING AROUND IT FOR SEVERAL YRS NOW. WE HAVE HAD SEVERAL CLOSE CALLS INVOLVING AIRBUS EARLY TURNS AND WE SHOULDN'T BE COMPLACENT WAITING FOR THE INEVITABLE OP ERROR TO OCCUR. AIRBUS ACFT SHOULD OVER-FLY THE FIXES FILED BY ITS PLTS IN THE SAME MANNER AS OTHER RNAV ACFT. CTLRS SHOULD BE ABLE TO OPERATE A SECTOR WITH REASONABLE ASSURANCE THAT ACFT WILL NAVIGATE VIA THE FIXES FILED IN THEIR FLT PLANS AND NOT MAKE UNEXPECTED MANEUVERS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CALLBACK REVEALED THAT THE RPTR HAS THIS PROB WITH ONLY AIRBUS ACFT. IT HAS NOT BEEN A PROB WITH OTHER FMS (CODE E) AND GPS (CODE G) ACFT. HE CLAIMS IT IS AND ONGOING PROB THAT COMPLICATES MAINTAINING SEPARATION.