What is the first step in the manual signaling process?

In the manual signaling process, ensuring that the line is not in use by asking "LINE CLEAR?" is crucial as the first step. This action is essential for safety and efficiency in communication. By confirming that the line is clear, it prevents interference and potential miscommunication with other operators, thereby ensuring that messages can be conveyed without distraction or confusion.

This step establishes a protocol that helps maintain order and clarity in operations, especially in environments where multiple signals or communications may be taking place concurrently. Recognizing the necessity to check for an open line before proceeding with any further communication tasks underscores the importance of safety in aviation operations.