A320 CREW HAD YELLOW HYD SYS FAILURE IN ZAB CLASS A AIRSPACE. AFTER LNDG; A PAX RPTED CHEST PAINS.

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FO AND I WERE SCHEDULED TO FLY FROM PHX TO FLL. RECEIVED ACFT AND PREFLTED. FO NOTED NO ABNORMALITIES IN WALKAROUND; AND I NOTED NONE IN COCKPIT SET-UP. I NOTICED; HOWEVER; MULTIPLE MAINT WRITE-UPS ON HYD RELATED ISSUES. ALL WERE IN ORDER. WE DOUBLE CHKED HYD PAGE AND NOTED ALL 3 SYS HAD FULL QUANTITY OF HYD FLUID. WHILE TEMPTED TO CALL MAINT AND ASK WHY THIS ACFT WAS NOT TAKEN FOR A TEST FLT BEFORE BEING RETURNED TO SVC; TIME WAS TIGHT AND WE DECIDED ALL WAS IN ORDER. WE TOOK OFF AND CLBED TO FL330 ON COURSE. APPROX 30 MINS INTO FLT; RECEIVED 'HYD Y RESERVOIR LOW LEVEL' WARNING ON ECAM. HYD PAGE CONFIRMED ALL FLUID HAD LEAKED FROM Y SYS. WE ACCOMPLISHED ECAM PROCS; DECLARED AN EMER AND RETURNED TO PHX (WHILE TUS WAS SLIGHTLY CLOSER; ECAM ACTIONS HAD BEEN COMPLETED WITH NO FURTHER DEGRADATIONS NOTED. WE BRIEFED FLT ATTENDANTS AND HAD THEM PREPARE CABIN FOR EMER LNDG AND NO EVAC. (WITH Y SYS DOWN WE STILL HAD FULL FLT CTL; STEERING AND BRAKING; WITH ONLY 2 SPOILERS AFFECTED PER WING). INITIALLY WE WERE UNABLE TO CONTACT COMPANY SOC AND MAINT CTL ON SELCAL; UNTIL IN RANGE OF PHX. MAINT ADVISED TO CONTINUE IN AND MAKE AN OVERWT LNDG. ACCOMPLISHED OVERWT LNDG CHKLIST IN QRH AND LANDED NORMALLY ON RWY 8 IN PHX; THE LONGEST RWY. (WE LANDED 4900 LBS HVY; AT 14700 LBS; LNDG DISTANCE TABLE HAD BEEN CONSULTED AND FOUND WITHIN LIMITS.) AT 500 FT I CALLED 'BRACE; BRACE; BRACE' ON CABIN PA; THEN READ VERT SPD TO FO (PF) THROUGH TOUCHDOWN. LNDG ACCOMPLISHED AT APPROX 100 FPM VERT SPD. DURING TAXI IN; WE STOPPED ON TXWY TO HAVE FIRE MARSHALLS CIRCLE THE PLANE AND INSPECT; JUST IN CASE. NO PROBS WERE NOTED. AT THIS TIME WE GOT A CALL FROM THE CABIN; INDICATING THAT A PAX WAS DISTRESSED AND NEEDED MEDICAL ATTN. PROCEEDED TO GATE AND HAD PARAMEDICS BOARD AND ATTEND PAX. ASIDE FROM OXYGEN ADMINISTERED; I DON'T BELIEVE ANYTHING ELSE WAS REQUIRED TO BE ADMINISTERED TO PAX. NO FURTHER INCIDENTS OCCURRED. LESSONS LEARNED: 1) WHEN MAJOR WORK WAS DONE TO ACFT; RECOMMEND A TEST FLT; OR AT LEAST A CALL TO MAINT. 2) FO WAS PF WHILE CAPT WAS PNF AND MANAGED THE EMER. THIS; I BELIEVE; IS IDEAL. 3) NO CONTACT COULD BE MADE ON SELCAL UNTIL IN RANGE OF PHX; DESPITE MULTIPLE ATTEMPTS. THIS IS AN ONGOING PROB WITH SELCAL! 4) THE FLT ATTENDANTS SHOUTING 'GRAB ANKLES; STAY DOWN!' AFTER MY 'BRACE' CALL ALL-UP SEVERELY DISTRACTING. RECOMMEND ONLY 2 OR 3 SHOUTS. 5) WHILE PAX WERE REACCOMMODATED ON ANOTHER ACFT AND FLT ATTENDANTS WERE REPLANED AND DEBRIEFED; NO ATTEMPT WAS MADE TO REPLACE AND DEBRIEF PLTS. IN FACT; WHEN I CALLED CREW SCHEDULING AND ADVISED HIM OF THE SIT; HE CLAIMED THERE WERE 'NO MORE RESERVE CREWS' AND HE NEEDED US TO PRESS ON. I POLITELY DECLINED; STATING THAT THE FO AND I WERE TOO STRESSED OUT TO BE SAFE TO FLY FURTHER THAT DAY. REPLACEMENT OF FLCS SHOULD BE MANDATORY