KRiS 16 by Dane Smith | Sep 8, 2022 | 2 comments This quiz is for logged in users only. Username or Email Address Password Remember Me Time is Up! Time's up 2 Comments David Eldredge on September 26, 2022 at 9:08 am In regards to the FAA’s requirements prior to take off, do they not stipulate that “Critical surfaces” must be free of contaminants prior to take-off? This is not the same as the aircraft being clear of any form of frozen precipitation. I’m citing N 8900.478. Is there a rule or notice that says it must be clear of all frozen precipitation? Log in to Reply Roydon Wells on November 1, 2022 at 3:20 pm Yes, 135.227 and the S1 Supplement of the POH has the answer. Also check 91.527. Wings, control surfaces, stabilizing surfaces, propeller, windshield etc. must all be free of ice. Log in to Reply Submit a Comment Cancel replyYou must be logged in to post a comment.