What was found
ON APPROACH, LT MAIN GEAR DOWN INDICATOR DID NOT ILLUMINATE. ACCOMPLISHED ABNORMAL "GEAR WOULD NOT EXTEND" CHECKLIST. BOTTLE WAS DISCHARGED IAW CHECKLIST; UNEVENTFUL LANDING. NO LT GEAR INDICATION UNTIL AFTER LANDING. AN INSPECTION FOUND LT MAIN GEAR DOWN INDICATOR TO BE LOOSE IN THE SOCKET CAUSING THE LAMP TO BE INTERMITTENT. REPLACED BOTH BULBS, SERVICED AND RESET EMERGENCY BOTTLE IAW MM 33-10-08 AND 12-13-07. ALSO, RAN FLAPS AND BOTH ENGINE T/RS WITH NO DEFECTS NOTED.