What was found
LANDING / TAXI LIGHT SWITCH INOPERATIVE, MX TROUBLESHOOTING FOUND SWITCH OVERHEATED, BURNED AND POWER WIRE TO SWITCH TERMINAL SHOWED EVIDENCE OF OVERHEATING. SB09-6 REQUIRES INSP AND REPLACEMENT OF LANDING LIGHT SWITCHES WITH LISTED PN. THAT SB DID NOT IDENTIFY THE R-172E (T-41C) WHICH HAS A DIFFERENT PN SWITCH THAN IDENTIFIED IN SB09-6. THIS IS AN ON GOING PROBLEM SINCE THE FAA REQUIRED MORE USE OF THE LANDING LIGHTS IN FLIGHT FOR VISIABILITY. THE LANDING LIGHT CIRCUIT AND SWITCHES WERE NOT DESIGNED FOR CONTINUOUS USE OF THE LANDING AND /OR TAXI LIGHTS IN FLIGHT.