AN A320 FLC TURNS THE WRONG WAY IN THE HOLDING PATTERN AT PHX AND HAS A POTENTIAL CONFLICT WITH ANOTHER ACR MLG. PIC WAS USING THE STANDARD FORMAT AS CONTAINED WITHIN THE FMC'S DATABASE FOR A R TURN.

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WE WERE ON THE MISSED APCH PROC FOR RWY 26R. WE WERE THE SECOND ACFT TO MISS THE APCH FOR GND FOG THAT WOULD LAST FOR OVER 1 HR. THE APCH FREQ WAS VERY CONGESTED AS WELL AS THE COMPANY FREQ. SHORTLY AFTER WE MISSED THE APCH; THE CAPT TOLD ME TO GO TO COMPANY. I WAS OFF THE APCH FREQ DURING MOST OF THE VECTORING. WHEN I CAME BACK TO THE APCH CTL; I WAS TOLD THAT WE WERE TO EXPECT A HOLD AT A FIX ON ANOTHER RWY EXTENSION. THE CTLR THEN CHANGED THE FIX TO 'PRUNN' AND CLEARLY SAID HOLD 'E OF PRUNN ON THE LOC AT 5000 FT WITH L HAND TURNS.' AT THIS POINT WE WERE INTERCEPTING THE LOC. I READ BACK THE HOLDING INSTRUCTIONS AND SAW THE CAPT BUILDING THE HOLD IN THE FMCS. I LOOKED AT THE SCREEN TO SEE WHERE WE WERE AND I SAW PRUNN DIRECTLY IN FRONT OF US; BUT I FAILED TO NOTICE THE R HAND TURN. MOMENTS LATER; I MADE A POS RPT AS WE CROSSED OVER THE FIX; 'FLT X; OVER PRUNN AT 30 MINS PAST THE HR AT 5000 FT.' THE PLANE BEGAN ITS TURN AND THE CTLR IMMEDIATELY CAME BACK; 'FLT X; ARE YOU TURNING L?' CAPT TOOK THE ACFT OFF AUTOPLT AND SAID 'TELL HIM WE ARE TURNING BACK L NOW.' I SAID 'YES; WE ARE TURNING BACK TO THE L.' THEN ATC SAID 'YOU HAVE TFC AHEAD;' AND TOLD US 'TO DSND TO 4000 FT AND TURN L TO 210 DEGS.' CAPT AND I BOTH IMMEDIATELY SAW THE ACR Y JET AND HEARD A TFC ALERT ON TCASII BUT GOT NO RA. WE CONTINUED WITH VECTORS UNTIL WE WERE RE-ESTABLISHED IN THE HOLD AGAIN. FACTORS CONTRIBUTING WERE FATIGUE. WE STARTED THE TRIP ON NIGHTS FLYING FROM XA00 PM TO XM00 AM PHX TIME; AND REVERSED TO DAYS FLYING FROM XM00 AM TO XA00 PM ON THE 3RD AND 4TH DAYS OF THE TRIP. WE HAD BOTH COMPLAINED ABOUT FATIGUE. IN THE AIRBUS FMCS; THERE WAS A STANDARD HOLD AT PRUNN IN THE DATA BANK. THE CAPT DID NOT HEAR THE CTLR SAY 'L HAND TURNS' SO HE ENTERED THE PUBLISHED HOLD AT PRUNN. I WAS SO OVERLOADED BY CHANGING BACK AND FORTH BTWN DISPATCH AND APCH; THAT I DID NOT CATCH HIS MISTAKE.