Transcription of AC 91-74B - Pilot Guide: Flight In Icing Conditions
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Advisory Department of Transportation Federal Aviation Circular Administration Subject: Pilot Guide: Flight in Icing Conditions Date:10/8/15 AC No: 91-74B Initiated by: AFS-800 Change: This advisory circular (AC) contains updated and additional information for the pilots of airplanes under Title 14 of the Code of Federal Regulations (14 CFR) parts 91, 121, 125, and 135. The purpose of this AC is to provide pilots with a convenient reference guide on the principal factors related to Flight in Icing Conditions and the location of additional information in related publications.
Icing envelopes used for the certification of aircraft for flight in icing conditions specify atmospheric icing conditions in terms of altitude, temperature, Liquid Water Content (LWC), and drop size represented by the Median Volume Diameter (MVD). (The envelopes use the term mean effective diameter, but this equates to the MVD for the
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