AN ACR MADE A MISSED APCH TO ASSURE ITS NOSE LNDG GEAR WAS LOCKED DOWN.

Narrative

EXTENDED GEAR TO CONFIGURE FOR LNDG. NOSEWHEEL DOWN/LOCK INDICATOR DID NOT ILLUMINATE. CYCLED GEAR - 2ND ATTEMPT; STILL NO INDICATION. BROKE OFF THE APCH. CLBED WITH RADAR VECTORS TO HOLD ON LOC RWY 4. LEVELED OFF - FO FLYING AND MONITORING; CAPT TRYING TO COMMUNICATE WITH COMPANY MAINT. UNABLE TO REACH ON RADIO FREQ ARINC. EXCHANGED GEAR INDICATOR BULBS; SLOWED TO GEAR EXTENSION SPD; AND SUCCESSFULLY EXTENDED THE GEAR WITH DOWN/LOCKED INDICATORS ON ALL 3 GEARS. ALSO; IN TRANSIT LIGHTS ALL PROPERLY WORKED DURING GEAR EXTENSION. WE EXPECTED THE TRANSIT LIGHT WOULD NOT WORK BECAUSE THIS WAS THE LIGHT WE EXCHANGED. SINCE ALL WORKED; HE PRESUMED THE PROB WAS A DIRTY CONTACT THAT WE 'FIXED' DURING EXCHANGE. BECAUSE ALL APPEARED NORMAL; WE SAW NO REASON TO RPT UNNECESSARY DELAYS. 2 FLTS LATER; THE PROB OCCURRED IN BTV; VERMONT. EXCHANGING THE BULBS HAD NO EFFECT AND AFTER 2 FLY-BY'S; THE TWR STATED THE GEAR 'APPEARED DOWN'. WE REQUESTED EMER EQUIP STANDING BY AND LANDED WITHOUT INCIDENT. WE LATER PERFORMED A MAINT FERRY FLT TO HAVE GEAR INSPECTED. EVIDENTLY THE FIRST PROB SHOULD HAVE BEEN RPTED BUT; AT THE TIME; APPEARED TO BE NOTHING ANYONE COULD DO BECAUSE THE PROB APPEARED CORRECTED.