Overheat protection of aircraft cabin window anti-fogging/frosting measures

An aircraft anti-fogging and anti-frosting structural cabin window assembly, comprising:

• a structural cabin window containing a transparent viewing area and a non-transparent area;
• an electrically conductive transparent heating film (THF) component disposed along the transparent area of the structural cabin window, the THF component configured to generate thermal energy upon being activated due to low temperatures by receiving an electric voltage supplied by an aircraft electrical power source;
• and
• an electrically conductive positive temperature coefficient (PTC) component disposed along the non-transparent area and electrically-connected in series to the THF component for receiving the supplied electrical voltage, the PTC component configured with an electrical resistance that varies with sensed temperatures;
• wherein, in response to a temperature exceeding a high temperature threshold value (Tsetpoint), the electrical resistance of the PTC component increases to a level that reduces electrical current supplied to the THF component to prevent overheating of the structural cabin window by the THF component.