What is the required visibility minimum to attempt the Virgil I. Grissom VOR/DME RWY 13 approach?

To determine the visibility minimum required for the Virgil I. Grissom VOR/DME RWY 13 approach, it is essential to understand the approach category and the specific regulations that govern it. For many VOR/DME approaches, the visibility minimum is typically set to ensure sufficient visual reference for pilots as they transition from instrument flight to visual conditions when they are nearing the airport.

In this case, the correct choice of 0.5 mile visibility is consistent with the FAA regulations for certain approach procedures, specifically those categorized under lower minimums for instrument approaches under specific conditions. The requirement of 0.5 mile visibility allows pilots to have adequate distance to see the runway environment when they are on final approach, ensuring they can execute a safe landing once cleared visually.

Choosing 0.5 mile as the visibility minimum harmonizes with safety protocols that aim to minimize risks during the critical phases of flight while still accommodating certain operational capabilities of aircraft and crews. This would not be the case with higher visibility requirements such as 1 mile, 2 miles, or 3 miles, which would allow for a more conservative approach but could limit operational flexibility for the flight when conditions are appropriate for lower minimums.