What are the landing minimums for an aircraft when the glide slope is notamed out of service?

When the glide slope is not available, the appropriate landing minimums reflect the need for a higher visibility requirement for precision approaches. The choice of 1080/40 indicates that the decision altitude is set at 1080 feet above ground level, with a visibility requirement of 40 statute miles. This standard is set to ensure that pilots have adequate visual references for a safe landing, given that the vertical guidance typically provided by the glide slope is not in operation.

In cases where the glide slope is out of service, pilots must rely more heavily on horizontal navigation and visual cues, which is why the minimums reflect a stricter criterion compared to normal precision approach minimums. This is crucial for maintaining safety during landing, particularly in varied weather conditions.

It's important to note that different approaches have specific minimums established by aviation regulations, and they can vary based on several factors, including airport layout, surrounding terrain, and the type of aircraft operation.