What was found
WHILE ON APPROACH INTO BUF, WE EXTENDED THE LANDING GEAR JUST OUTSIDE OF THE FAF. THE LEFT MAIN LANDING GEAR GREEN LIGHT DID NOT ILLUMINATE. WE EXECUTED A MISSED APPROACH, CYCLED THE GEAR, AND IT PRODUCED BOTH MAIN LANDING GEAR LIGHTS OUT AND NOT INDICATING DOWN AND LOCKED. WE RAN THE LANDING GEAR WILL NOT EXTEND CHECKLIST, INCLUDING CYCLING THE GEAR, AND DID NOT RECEIVE A GEAR DOWN INDICATION. WE ACTIVATED THE EMERGENCY EXTENSION SYSTEM AND DID NOT NOTE ANY CHANGE IN THE INDICATOR LIGHTS. WE MADE A LOW PASS AND BUF TOWER CONFIRMED ALL 3 LANDING GEAR APPEARED EXTENDED. WE THEN MADE A NORMAL LANDING WITHOUT EVENT, TAXIED CLEAR OF THE RUNWAY, AND SHUT DOWN AT THE FBO.