2 hours ago · Science · hide · 0 comments

"Very limited amounts of data are presently available for variables associated with ZR and ZL [SLD] conditions aloft." Public Domain figure from DOT/FAA/AR-09/45 ("FZDZ" or "ZL" is freezing drizzle, a form of supercooled large drops, SLD). A tragic accident leads to icing research In 1994 an accident occurred near Roselawn 1, Indiana, USA, that was later attributed in part to Supercooled Large Drop icing (SLD, drop sizes large than those in 14 CFR Part 25 Appendix C) 2. This led to a multinational effort to better understand such icing conditions and their effects on aircraft. New regulations ("Appendix O") were published in 2014 2. The wikipedia article 1 is an excellent summary of the event. One also will be well rewarded for studying the detailed National Transportation Safety Board reports 3 4. FAA Inflight Aircraft Icing Plan Airworthiness Directives and other interim measures were imposed soon after …

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