How is a part-time tower or ATIS depicted on an Instrument Approach Procedure (IAP)?

A part-time tower or ATIS (Automatic Terminal Information Service) is depicted on an Instrument Approach Procedure (IAP) with an asterisk sign. This symbol indicates to pilots that the facility operates only during certain hours, rather than continuously. It is crucial for pilots to understand the operational status of air traffic services as it impacts their approach and landing plans. Knowing the hours of operation helps ensure that pilots are prepared for potential changes in communication services when approaching the airport, allowing for safe planning and execution of the approach. Asterisks are a clear way to communicate this important information in the standardized format used for IAPs.