How many independent ice detectors/microprocessors are in the ice and rain protection system?

The correct answer indicates that there are two independent ice detectors or microprocessors in the ice and rain protection system. This configuration is essential for enhancing the reliability and effectiveness of the system. By using two independent detectors, the system can cross-verify the information regarding ice accumulation, which provides a redundancy that is critical for safety. If one detector were to fail or provide inaccurate data, the second detector can still function to monitor and manage ice conditions. This dual system helps ensure that the aircraft operates safely in potentially hazardous weather conditions, such as when flying in rain or icing encounters.

In contrast, having only one detector might be less reliable, as it would not have a backup to verify the information or compensate for a failure. More than two detectors could be considered overly complex and potentially unnecessary for the typical operational requirements of the system. Therefore, two independent microprocessors strike a balance between reliability and complexity.