What was found
CREW REPORTED RT MAIN LANDING DOWNLOCK LIGHT FAILED TO ILLUMINATE ON APPROACH. PERFORMED GEAR EXTENSION, WILL NOT EXTEND HY, LANDING WITH DEFECTIVE GEAR CHECKLIST. PERFORMED EMERGENCY GEAR EXTENSION, STILL NO DOWNLOCK INDICATION. DECLARED EMERGENCY, LANDING WAS UNEVENTFUL. MX PERFORMED MULTIPLE GEAR SWINGS, COULD NOT DUPLICATE DISCREPANCY. R & R RT MLG ACTUATOR AS A PRECAUTIONARY MEASURE. ACFT RELEASED BACK TO SERVICE.