What was found
LT MAIN GEAR FAILED TO SHOW, DOWN AND LOCKED UPON LANDING. ROTORY TEST SHOWED BULB WORKED AND EMERGENCY CHECKLISTS WERE PREFORMED. T-HANDLE AND BLOW DOWN KNOB WERE BOTH PULLED. EMERGENCY WAS DECLARED AND SHORTLY BEFORE LANDING THE LT MAIN GEAR DID ILLUMINATE FOR A NORMAL LANDING. R & R LT MLG ACTUATOR, WITH A INSPECTED SERVICABLE UNIT, IAW MM 32-30-04; OPS CHECKS SATISFACTORILY. FOUND BLOW DOWN BOTTLE NOT TO HAVE BEEN ACTIVATED, BREAKAWAY WIRE/YELLOW TAG IN PLACE - HANDLE NOT MOVED. REPLACED BREAKAWAY WIRE ON "T" HANDLE.