How many AC power sources are required for the windshield heat to function normally?

For the windshield heat system to operate normally, two AC power sources are required. This is because the design of the ERJ incorporates redundancy in its critical systems to ensure reliability and safety during operation. The windshield heating system relies on these two power sources to provide adequate heating.

If one power source were to fail, the second source would still be able to supply the necessary power to maintain the windshield heating functionality, which is vital for maintaining visibility in adverse weather conditions, such as rain, snow, or ice. The dual AC power source setup is part of the overall safety measures that are standard in more advanced regional jets, ensuring that critical systems remain operational under various circumstances. This redundancy is essential for compliance with aviation safety regulations and helps to minimize the risk of cockpit visibility issues during flights.