Comments on “Characterization of Aircraft Icing Environments with Supercooled Large Drops for Application to Commercial Aircraft Certification”

The Roselawn accident was caused by SLD.1 The Federal Aviation Administration (FAA) has published a Notice of Proposed Rulemaking (docket number FAA-2010-0636) and is in the process of issuing new certification regulations for engines [Code of Federal Regulations, title 14, part 33 (14 CFR 33, appendix D-Ice crystals)] and for "Transport Category Airplanes" (14 CFR 25, appendix O-SLD). The drop size distributions for SSCDD are between the drop size distributions for freezing-drizzle environments for MVD > 40 μηι and MVD < 40 μηι. [...]the climatological values of drop sizes provided by CI12 do not represent the SSCDD icing environment. 3.