Which element of approach minimums most directly influences the decision to initiate or continue an instrument approach?

• A. They set the required visibility
• B. They determine the instrument approach category requirements
• C. They specify the maximum airspeed on approach
• D. They decide crew rest

Answer: (B)

The key idea is that the minimums you must meet for an instrument approach are published for each approach category, and the category is based on the airplane’s approach speed. That means which minimums apply to you—and thus whether you may start or continue an approach—depends on your aircraft’s category. Once you know your category, you compare the actual weather and altitude conditions to the minima for that category. If the conditions meet or exceed those minima, you can initiate or continue the approach; if not, you must not proceed.

The required visibility is part of those minima, but it’s the category-based minima that directly determine which thresholds you must satisfy. The other factors listed don’t set the applicable thresholds in the same direct way.