What was found
CREW REPORTED ON DEPARTURE THE LANDING GEAR ICAS MESSAGE LG/LEVER DISAGREE. RH MLG NOTED AS NOT UP AND LOCKED. CREW PUT THE GEAR DOWN AND REPORTED THREE DOWN AND LOCKED. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT LANDED WITHOUT INCIDENT. UPON INSPECTION OF THE RH MLG, IT WAS FOUND THAT THE SUPPORT FOR THE PROXIMITY SWITCH (PN 2309-2070-004) WAS CRACKED THROUGH THE MOUNTING HOLE FOR THE SWITCH ON THE SUPPORT. THE CRACK ALLOWED THE PROXIMITY SWITCH TO SEPARATE FROM THE SUPPORT. THE SUPPORT WAS REPLACED, OPERATIONAL CHECK WAS PERFORMED AND THE AIRCRAFT WAS RETURNED TO SERVICE.