What is the implication of a closed control tower at an alternate airfield?

When a control tower is closed at an alternate airfield, it has significant implications for managing approaches to that airfield. The correct understanding is that without an operational control tower, no air traffic control services are available to provide guidance or clearance for the various approaches to the airport. This means that pilots cannot expect to receive air traffic advisories or assistance during their approach or landing.

Consequently, if the tower is closed, pilots must be prepared for potential limitations and must not plan on using any approaches that require control tower services. While there may still be procedures for instrument approaches available for use, the lack of a control tower means those approaches cannot be used in the standard manner that usually involves ATC clearance, as operational control to facilitate those procedures is absent.

This situation results in heightened responsibilities for pilots to ensure they understand the requirements and limitations associated with operating in an uncontrolled environment. As such, the planning process for approaching an alternate airfield without a control tower necessitates considering other options, including different airports or visual flight rules if weather conditions permit.