What was found
PILOTS REPORTED THAT LANDING GEAR WOULD NOT EXTEND, THEY THEN PULLED THE EMERGENCY EXTENSION VALVE AND THE GEAR LOWERED WITH THREE GREEN. UPON INSPECTION FOUND THE EMERGENCY GEAR EXTENSION VALVE TO BE, SPRAYING HYDRAULIC FLUID IN NOSE BELOW HEATER. THIS IN TURN DEPLENISHED ALL FLUID IN RESERVOIR AND BURNED UP HYDRAULIC POWERPAK. SUSPECT INCORRECT ORING IN VALVE.