What is true about the Morse code identification of the Key West TACAN as indicated in fig 38?

The Morse code identification for the Key West TACAN indicates that the signal is removed daily during specific hours. This is typical for certain navigational aids, particularly in locations where air traffic is limited or where maintenance occurs. The operational strategy behind this choice likely corresponds with the schedules of aircraft operations in the surrounding airspace, allowing for a more efficient use of resources and reducing potential interference during off-peak times.

Understanding this, the other options do not align with common operational practices. Continuous operation throughout the day would imply that the TACAN is always active, which does not reflect the specific operational context of Key West. Not having specific operating hours would suggest an indefinite availability, which contradicts the established practice of regular maintenance or operational downtime. Operating only on weekends implies a restricted availability that would not typically apply to a navigational aid, as consistent operation during the week is necessary for aircraft reliant on this navigation method. Thus, the correct identification reflects that there are indeed designated times for its inoperation, aligning with standard procedures in aviation operations.