The icing threshold of 10C for TAT has an exception when SAT is below what temperature?

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Multiple Choice

The icing threshold of 10C for TAT has an exception when SAT is below what temperature?

Explanation:
Icing potential is evaluated using the total air temperature (TAT) alongside static air temperature (SAT). The common rule is that icing is unlikely if TAT is above 10°C, and becomes a concern as TAT drops to 10°C or below, provided there is visible moisture. The important exception to this rule is when the SAT is extremely cold—below -40°C. In that ultra-cold regime, the air cannot contain liquid water droplets in a form that would cause icing, so the 10°C TAT threshold doesn’t apply. In other words, below -40°C SAT, icing isn’t expected regardless of TAT.

Icing potential is evaluated using the total air temperature (TAT) alongside static air temperature (SAT). The common rule is that icing is unlikely if TAT is above 10°C, and becomes a concern as TAT drops to 10°C or below, provided there is visible moisture. The important exception to this rule is when the SAT is extremely cold—below -40°C. In that ultra-cold regime, the air cannot contain liquid water droplets in a form that would cause icing, so the 10°C TAT threshold doesn’t apply. In other words, below -40°C SAT, icing isn’t expected regardless of TAT.

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