What was found
AFTER FLT DEPT CAE, NR 3 HYDRAULIC QUANTITY READ ZERO. NOSE GEAR INDICATED DOWN, ONE MAIN INDICATED UP, THE OTHER MAIN INTRANSIT. CREW EXTENDED GEAR MANUALLY. FLT DECLARED AN EMERGENCY AND DIVERTED BACK TO CAE. FLT LANDED IN CAE WITHOUT FURTHER INCIDENT. INSTALLED NEW HYD TUBING (P/N 600-75226-60), (S/N 1307718), PERFORMED LEAK CHECK AFTER SWAGING. NO DISCREPANCIES NOTED.