What type of temperature requires corrections at a published snowflake temperature on an IAP?

The correct answer centers on the concept of snowflake temperature, which is a reference point used in Instrument Approach Procedures (IAPs) to ensure safe operations under certain weather conditions. The published snowflake temperature indicates the threshold at which icing conditions can occur.

When the temperature reaches this critical point, specific corrections are required to account for the potential impact of icing on aircraft performance and flight safety. Hence, all temperatures at the published snowflake temperature necessitate corrections to ensure that they align with the operational parameters established for safe flight.

This understanding is essential for pilots when preparing for approaches in cold weather conditions, as it emphasizes the need for vigilance and adjustment of performance calculations to maintain flight safety in the presence of possible ice accumulation on the aircraft.