What was found
(CAN) ON APPROACH TO YXM WHEN GEAR SELECTED DOWN NOSEGEAR FAILED TO EXTEND, LT & RT MAIN INDICATED DOWN & LOCKED. DUE TO POOR WEATHER & BETTER FACILITIES CREW ELECTED TO PROCEED TO THEIR ALT OF YTH. WHEN LDG GEA R AGAIN SELECTED DOWN ATYTH, TOWER CONFIRMED THAT MAINS WERE DOWN BUT NOSE GEAR STILL IN WHEELWELL. TIME, HOWEVER, NO GEAR DOWN IND. FOR ANY OF GEAR. EMERG EXTENSION PERFORMED, EXTENDING ALL THE GEAR BUT STILL NO GEAR DOWN IND. FLY BY CONFIRMED ALL GEAR WERE DOWN & A/C LANDED W/O INCID. THE LDG GEAR IND REPL, RESTORING GEAR DOWN IND..A SUBSEQUENT TEST & INSP OF LDG GEAR COULD NOT DUPLICATE FAILURE OF NOSE GEAR.