LOSS OF 'C' SYS HYDS NECESSITATES AN AIRBORNE GEAR INSPECTION AND DIVERSION TO ALT ARPT.

Narrative

ON APCH INTO EWR WE WERE FLYING THE ILS RWY 4R. ON FINAL; APCHING THE GS; I CALLED FOR THE GEAR TO BE LOWERED. WHEN THE CAPT LOWERED THE HANDLE; ALMOST IMMEDIATELY A LOUD BANG WAS HEARD AND THE ACFT SHUDDERED. WE IMMEDIATELY EXECUTED A GAR AND SHORTLY AFTER DISCOVERED WE LOST ALL FLUID IN THE CTR HYD SYS. IN ADDITION; THE NOSE AND R MAIN GEAR SHOWED DOWN AND LOCKED; BUT THE L GEAR-DOWN INDICATOR WAS OFF. FOR THE NEXT 1 1/2 HRS WE TROUBLE SHOT THE SYS TO NO AVAIL. ON AN ACFT FLYBY; THE GEAR WAS RPTED DOWN; AND A TWR FLYBY AT JFK ALSO CONFIRMED THE GEAR WAS DOWN; BUT WE NEVER GOT A LOCKED INDICATION. THE FLT ATTENDANTS BRIEFED THE PAX ON AN EMER LNDG AND EVAC. HOWEVER; THE LNDG WAS UNEVENTFUL; AND WE WERE TOWED TO THE GATE (WE DIVERTED TO JFK). 1 OTHER FAILURE OCCURRED AFTER WE LOST THE C SYS HYDS. BEFORE THE FAILURE; THE FLAPS WERE OUT TO 15 DEGS. FOR THE REST OF THE FLT; THE FLAPS REMAINED AT 15 DEGS. ALL ATTEMPTS WITH THE ALTERNATE FLAPS WERE UNSUCCESSFUL. SUPPLEMENTAL INFO FROM ACN 207981: NUMEROUS EICAS AND STATUS MESSAGES APPEARED.