In which scenarios is it necessary to apply cold weather corrections when departing an aerodrome?

Applying cold weather corrections is necessary when the temperature is less than or equal to 32°F. In cold weather conditions, the performance of an aircraft can be adversely affected, particularly regarding takeoff and landing distances. Cold weather typically results in denser air, which affects lift, engine performance, and overall aircraft efficiency.

When the temperature drops to or below freezing, pilots must account for how these lower temperatures can impact the aircraft's ability to generate lift and the required runway length for safe operations. Factors such as ice and snow on the runway, potential weight considerations for fuel and cargo, and engine performance variations all become critical as temperatures decline. Therefore, it is essential for pilots to apply cold weather corrections in these scenarios to ensure safety and operational effectiveness.

In other conditions such as temperatures above freezing, or when flying at lower altitudes or over deserts, these specific cold weather corrections may not be necessary. They do not introduce the same risks associated with freezing temperatures, which is why those scenarios do not warrant the same level of precaution.