Originally Posted by rayds
"The general rule is that the more ice particles and the fewer liquid
drops that are present, the less ice accumulation on the airframe. This is because the ice particles
tend to bounce off an aircraft surface, while the supercooled drops freeze and adhere. As a result,
ice accumulation is often greatest at temperatures not too far below 0 °C (32 °F), where LWC
can be abundant. LWC is usually negligible at temperatures below about -20 °C (-4 °F)"
"Tests have shown that when outside air temperatures (OAT)
are near freezing, the result is no ice accretion near the stagnation point, but the freezing or
refreezing of water running back on the airfoil, causing runback ice accretions, possibly behind
the protected areas. The formation of a ridge is possible. Pilots should be vigilant at OAT
between -5 °C (23 °F) and +2 °C (35 °F)."
https://www.faa.gov/documentLibrary/.../AC_91-74B.pdf
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