AN ACR CAPT RETURNED TO THE GATE BEFORE TKOF BECAUSE OF AILERON FLUTTER AND HYD LOW PRESSURE. WITH 10 MEL'S ON THE ACFT; HE FINALLY REFUSED TO FLY IT.

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AFTER LEAVING THE GATE WITH A MARGINALLY ACCEPTABLE ACFT WHICH HAD 7 PLACARDS AND WAS RESTR TO NO OVERWATER FLTS; WE EXPERIENCED A FLT CTL PROB DURING THE AILERON CHK ON THE TAXI CHKLIST. OUR #3 R WING ROLL SPOILER WAS FLUTTERING AND SHAKING THE AIRPLANE WITH FULL R AILERON APPLICATION. WE RETURNED TO THE SAME GATE AND CALLED MAINT. DURING THEIR GATE SYS CHK; THE GREEN ELECTRIC HYD PUMPS FAILED WITH LOW PRESSURE LIGHTS ON AND THEN WE ALSO NOTICED THE DFDR FLT DATA RECORDER SYS ALSO FAILED. MAINT RESET A TRIPPED CIRCUIT BREAKER DOWNSTAIRS FOR THE GREEN ELECTRIC HYD PUMPS AND PRESSURE WAS NORMAL FOR ABOUT 10 SECONDS BEFORE IT FAILED AGAIN WITH ASSOCIATED LOW PRESSURE LIGHTS ON AND LOW PRESSURE CONFIRMED ON ECAM. AFTER AN HR AND A HALF DELAY MAINT'S FIX WAS TO ISSUE 3 MORE PLACARDS FOR THE GREEN SYS ELECTRIC HYD PUMPS; THE COMPLETE FLT DATA RECORDING SYS; AND ROLL SPOILERS #2 AND #3 ALL PLACARDED INOP. WE NOW ARE UP TO 10 PLACARDS AND AFTER DISCUSSING WITH DISPATCH; THE MECHS; MY FO AND OTHERS; I DECIDED IN THE INTEREST OF SAFETY TO REJECT THIS CRIPPLED ACFT SO IT COULD GO WHERE IT BELONGS (THE HANGAR TO GET ALL THIS STUFF FIXED) AND SUBSEQUENTLY THE FLT CANCELLED.