What was found
ON OCTOBER 1ST, 2021, AIRCRAFT TAIL NUMBER N10RZ WHILE ON APPROACH TO KSLE, THE LANDING GEAR DID NOT INDICATE DOWN AND LOCKED. THE CREW DECIDED TO RETURN TO THEIR DEPARTURE FIELD (KBOI) DUE TO IMC CONDITIONS AT KSLE AND MAINTENANCE AVAILABILITY. N10RZ PERFORMED TO PASSES BY THE TOWER AT KBOI AND DETERMINED THE GEAR WAS DOWN BUT NO VERIFICATION IT WAS LOCKED. AN EMERGENCY WAS DECLARED AND N10RZ CIRCLED THE FIELD TO BURN DOWN TO MINIMUM FUEL FOR LANDING. N10RZ THEN PROCEEDED TO LAND SAFELY WITH NO ISSUES. TECHNICIANS FOUND THE LH MAIN LANDING GEAR DOWN LOCK SWITCH ROLL PIN ON THE LH MAIN LANDING GEAR ACTUATOR HAD BACKED OUT CAUSING THE INDICATION ISSUE. THE LH MAIN LANDING GEAR ACTUATOR WAS REPLACED, AND OPERATIONAL CHECKS COMPLETED SATISFACTORILY.