If the weather at an airfield is 100-foot ceiling and 0.25 mile visibility, what should you do if you planned for a straight-in ILS approach?

In this scenario, the weather conditions present a significant challenge for executing a straight-in ILS approach. The ceiling of 100 feet and visibility of 0.25 mile are below what is typically required for a straight-in ILS approach. Most ILS approaches have minimum visibility and ceiling requirements that must be met to ensure safe landing.

When visibility is less than the established minimums for the approach, it is critical to prioritize safety and adhere to these guidelines. Not starting the approach due to these minimums ensures that a pilot does not place themselves in a position where they may not be able to see the runway environment at decision altitude, which could result in an unsafe landing scenario.

The regulations and standard operating procedures are designed to prevent accidents by maintaining strict adherence to published weather minimums. Therefore, recognizing that the visibility is below the required threshold justifies the decision to not begin the approach to maintain the highest level of safety for both the aircraft and its occupants.