What was found
AT 600 FT AGL RECEIVED NLG UNSAFE (YELLOW CROSSHATCHED) ACCOMPLISHED G O AROUND AND CW QRH PROCEDURE. CYCLED GEAR AND RECEIVED 3 GREEN (INTER MITTENT) MC THIS INDICATION IS WITH GEAR DOWN ONLY AND INTERMITTENT. *FROM PLOT* - THE PILOT WAS ON APPROACH AND SELECTED GEAR DOWN. WHEN HE REACHED 600 FT, HE GOT A MSG THAT HIS NOSE GEAR WAS NOT GREEN, HE WENT AROUND, RAN THE QRH MANUAL, TURNED SYSTEM 3 HYDRAULIC PUMPS ON, CYCLED THE GEAR, HE GOT 3 GREEN, AND THEN LANDED.