What component is essential for the operation of an electrically heated windshield system?

The windshield control unit is crucial for the operation of an electrically heated windshield system because it regulates the heating elements embedded within the windshield. This control unit is responsible for initiating and terminating the heating cycle based on the operational demands, such as preventing ice accumulation and ensuring clear visibility in adverse weather conditions. It allows the pilot or flight engineer to manage the heating system effectively to maintain optimal windshield performance without damaging the glass or compromising safety.

Other components, such as windshield wipers, pressure relief valves, and cabin temperature sensors, do play important roles in aircraft operations, but they do not directly control or operate the heating mechanism for the windshield itself. Therefore, while they contribute to overall aircraft functionality, they are not essential for the specific operation of the electrically heated windshield system.