[ASpilot2be]

Originally Posted by calcapt

A wing becomes cold soaked when it has been flown on longer legs and the fuel temperatures become super cold. Generally anytime the fuel is below freezing and the fuel is in contact with the upper or lower wing surface, the wing is considered to be cold soaked. When an airplane arrives at it's destination and moisture (rain or humidity) comes in contact with this wing containing very cold fuel, the moisture will freeze in the form of frost or clear ice and adhere to the wing even though the outside temperatures are well above freezing. This can catch you by surprise the first time you see it. The wing is considered to be not cold soaked when the fuel contained in it reaches temperatures above freezing. If warmer fuel is added to the aircraft before the next leg, that will normally take care of the cold soaked issue; however, if you don't add fuel, it could take quite a bit of time to allow the fuel to warm. You may be able to deice and anti-ice the wing always referring to the cold soaked wing tables in your specific aircraft manual.

Thanks.