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johntlewis · January 17th, 2007, 18:38

Being a CFII with very little actual flying in IMC, I don't have experience with icing. What exactly is "known" icing?

In the AIM it says "Atmospheric conditions in which the formation of ice is observed or detected in flight." (7-1-23). However, this seems to be in reference to PIREP's. So is "known" icing based upon pilot reports?

Further according to 91.527, you cannot fly into known icing conditions, but how can you know if it's actually icing conditions unless you actually fly into it?

I realize that under IFR you cannot even fly into forecast icing conditions (91.527) (b) (1). However, I'm still confused on when exactly icing conditions become known.

January 17th, 2007, 18:38	#1
johntlewis Junior Member Join Date: Jan 2007 Location: Outer Marker Inbound Posts: 59	What is Known Icing? Being a CFII with very little actual flying in IMC, I don't have experience with icing. What exactly is "known" icing? In the AIM it says "Atmospheric conditions in which the formation of ice is observed or detected in flight." (7-1-23). However, this seems to be in reference to PIREP's. So is "known" icing based upon pilot reports? Further according to 91.527, you cannot fly into known icing conditions, but how can you know if it's actually icing conditions unless you actually fly into it? I realize that under IFR you cannot even fly into forecast icing conditions (91.527) (b) (1). However, I'm still confused on when exactly icing conditions become known.