Which of the following is not needed for ice to accumulate on your aircraft?

Question

Which of the following is not needed for ice to accumulate on your aircraft?

BlackTom AI · Accepted Answer

When considering icing accumulation on aircraft, it's helpful to map out the conditions that typically lead to ice buildup. 
Option 1: 'supercooled liquid water droplets' are a key source of icing in most common conditions; these droplets are liquid at temperatures below freezing and freeze upon impact with the aircraft surface, initiating and sustaining accretion. 
Option 2: 'ice crystals' are not a required component for standard aircraft icing; ice crystals (snow) do not readily adhere and melt/recrystallize in the same way as supercooled droplets, so they do not participate as the primary mechanism for typical icing buildup. This makes this option a candidate for being not needed. 
Option 3: 'aircraft skin temperature below freezing' is a fundamental prerequisite for icing; if the surface is above 0°C, impact ice would typically not accumulate or would sublimate, so sub-freezing skin temperature is necessary for sustained icing to occur. 
In summary, supercooled liquid water droplets and sub-freezing surface temperatures are central to ice accumulation, whereas ice crystals themselves are not required for the common icing process. Therefore, the statement about ice crystals being involved is the one that is not needed for ice to accumulate on the aircraft.

WX 301 WX301 Fall 2025 Exam 3- Requires Respondus LockDown Browser

Which of the following is not needed for ice to accumulate on your aircraft?

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