What is the primary purpose of cockpit window heating systems?

The primary purpose of cockpit window heating systems is to prevent ice formation on the windows. These heating systems are essential because, in flight at high altitudes, temperatures can drop significantly, leading to conditions where ice can form on the aircraft's windows. Ice accumulation can obstruct the pilots' view, potentially endangering flight safety.

By maintaining the cockpit windows at a temperature above freezing, these systems ensure clear visibility, which is crucial for navigation and operation during various weather conditions. While other functions such as enhancing visibility can be a secondary benefit, the main design intention of heating systems is to manage ice and prevent any operational issues that may arise from it.