What was found
FCA - AFTER GEAR RETRACTION, NOSE GEAR UNSAFE LIGHT ILLUMINATED. GEAR WAS CYCLED AS PER CHECK LIST, AT SUCH TIME THE NR 1 HYDRAULIC QUANTITY INDICATED ZERO. AFTER COMPLETING HYDRAULIC FAILURE CHECK LISTS, EMERGENCY WAS DECLARED. AIRCRAFT LANDED WITH EXTENDED ROLL OUT, BUT WITH OUT FURTHER COMPLICATIONS. AIRCRAFT GROUNDED.