What was found
(CAN) ON APPROACH THE LT MLG FAILED TO INDICATE DOWN AND LOCKED, EMERGENCY EXTENSIONS WERE PERFORMED BUT GEAR STILL FAILED TO INDICATE DOWN AND LOCKED. AIRCRAFT LANDED WITHOUT INCIDENT. A SUBSEQUENT INSPECTION COULD NOT DUPLICATE THE DEFECT, LT I/B DOWN LIMIT SWITCH. THE LANDING GEAR TESTED EXTENSIVLY AND THE AIRCRAFT RETURNED TO SERVICE. THE SWITCH IS AN IMPROVED SWITCH INSTALLED PER S/B 32-025.IT IS OUR EXPERIENCE THAT THE AIRCRAFT EQUIPPED WITH THE MAGNETIC LANDING GEAR INDICATOR SYSTEMS ARE PROBLEMATIC WHEN OPERATED IN COLDER TEMP S.