What is considered marginal weather?

• A. Destination: Ceiling at minimums; Alternate: Visibility at minimums
• B. Destination: Visibility at minimums; Alternate: Visibility and Ceiling at minimums
• C. Destination: Wind at minimums; Alternate: Temperature at minimums
• D. Destination: Visibility above minimums; Alternate: Visibility below minimums

Answer: (C)

Marginal weather means you’re operating at the edge of the published minimums, where small changes in conditions can push operations into trouble. In this item, it’s defined by two tied conditions: at the destination, the wind is at its minimum value allowed for the approach; at the alternate, the temperature is at its minimum value used for planning. The wind at minimums at the destination tightens the safety margin for the approach and landing, while the minimum temperature at the alternate directly affects performance calculations and the viability of using that alternate. When these two come together, conditions are at the threshold, hence marginal weather. The other scenarios involve different parameters (like visibility or ceiling) that aren’t aligned with how marginal weather is defined in this context.