Aircraft Icing Intensities

"AN ENGINEERING-ENABLED (MEASURABLE! AND CALCULABLE!) ICING SEVERITY SCALE" Title from an outline of topics by Dr. Jeck. Image from an Icing Information Note. Introduction Dr. Jeck's "A History and Interpretation of Aircraft Icing Intensity Definitions and FAA Rules for Operating in Icing Conditions" 1 outlines the history in the US Code of Federal Regulations. Changes require a public comment period, so there was often debate (and on some occasions controversy). The definitions can affect which aircraft are certified perform Flight In Known Icing (FIKI), so there is great economic and practical interest to any changes. See 1969 Aircraft Ice Protection Report of Symposium for Dr. Jeck's summary of one controversial occasion in 1969. Dr. Jeck proposed a "universal curve" and made recommendations for changes as part of the The FAA Inflight Aircraft Icing Plan (discussed in "Dr. Jeck's Works on Supercooled Large Drops"). FAA Inflight Aircraft Icing Plan 2 Task …