AN A319 WHILE TAXIING HAD GREEN HYD SYS FAILURE. ALTERNATE BRAKES APPLIED AND ACFT CAME TO AN ABRUPT STOP. 3 CABIN ATTENDANTS INJURED.

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I WAS TAXIING THE ACFT ON SINGLE ENG. THE GREEN HYD SYS LOST ALL FLUID. THE ACFT LOST NOSEWHEEL STEERING AND BEGAN TO HEAD TOWARD THE GRASS ON THE R OF TXWY. I ATTEMPTED TO APPLY THE BRAKES WHILE TELLING THE FO I HAD NO BRAKES. AS I WAS REACHING FOR THE YELLOW PUMP AND STILL APPLYING BRAKES (I STILL DID NOT HAVE THEM) THE ALTERNATE BRAKES GRABBED AND WE CAME TO AN ABRUPT STOP. WHEN WE WERE DONE SECURING THE ACFT AND DOING THE ECAM; I CALLED TO SEE HOW THE FLT ATTENDANTS WERE DOING. I WAS INFORMED AT THAT TIME THAT THE PURSER HAD FALLEN AND HURT HER BACK. SHE SAID SHE DIDN'T NEED IMMEDIATE ATTN BUT HER BACK WAS IN A LOT OF PAIN. I ALSO LEARNED A LITTLE LATER THE OTHER 2 FLT ATTENDANTS WERE INJURED IN THE STOP. MEDICAL ATTN WAS REQUESTED AND RECEIVED WITH 2 OF THEM GOING TO THE HOSPITAL TO BE CHKED. WE WERE PROBABLY TAXIING AROUND 15 KTS. THERE WERE NO RPTED PAX INJURIES. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE LOSS OF THE GREEN HYD SYS WAS UNKNOWN AS MAINT HAS NOT RELEASED THE MAINT ACTION TAKEN. SUPPLEMENTAL INFO FROM ACN 669337: AN ACFT BEHIND US INDICATED WE HAD FLUID POURING FROM THE BELLY OF THE ACFT. WE TOLD GND CTL WE WERE GOING TO HAVE TO BE TOWED BACK TO THE GATE DUE TO NO NOSEWHEEL STEERING. CALLBACK CONVERSATION WITH RPTR ACN 669337 REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT MAINT HAS RELEASED NO INFO ON THE LOSS OF THE GREEN HYD SYS AND THE COMPONENT FAILURE.