What was found
MOMENTS AFTER GEAR RETRACTION WE HAD AN INDICATION OF A TOTAL LOSS OF GREEN HYDRAULIC FLUID. BOTH ECAM HYDRAULIC PAGE AND ANALOG GAUGE SHOWED ZERO. EMERGENCY DECLARED. MOCC AND GOC NOTIFIED. COMPLIED WITH ECAM AND QRH FOR MANUAL GEAR EXTENSION. AFTER GEAR WAS MANUALLY EXTENDED THE GREEN SYSTEM QUANTITY CAME BACK UP INTO THE GREEN. AS WE WERE BEING TOWED IN THE QUANTITY HAD DROPPED DOWN ALMOST TO THE YELLOW ARC. AMM: 27-88-15-04 A300. R & R L/H NOTCH FLAP ACT. RIG, OPS & LK CK S OK. REMOVED AND REPLACED GREEN SYS ACCUMULATOR IAW AMM 29-11-56-04. OPS AND LEAK CHECK GOOD. A/C OK FOR SERVICE.