Originally Posted by
Lord Farringdon
Thanks for chiming in tdtracer. Your explanation has helped this old guy better understand this condition. So,basically the supercooled ice crystals have to warm up and melt before they can stick otherwise they just bounce off the aircraft, (unlike supercooled large droplets which cool down and stick when they come in contact with colder surfaces). So the ice crystals find the engine core and compressor blades comfy places to rest. I just read also that pitot tubes can also be affected by this which tends to lead to transient and spurious air data readings.
ICI is a phenomenon accounted with strong convective activity. It’s diagnosed typically (on my type at least) when the tat reads zero (due to a heavily iced up probe) in the vicinity of convective or CB