Early in 2003 the combined Engine Harmonization Working Group/Power Plant Installation Harmonization Working Group (EHWG/PPIHWG) was established to evaluate the effects of super-cooled large Droplets (SLD) and mixed phase/glaciated Icing conditions on commercial transport power plants. The effort began with an assessment of the extent of engine problems in SLD or mixed-phase/glaciated environments. Icing events from the engine manufacturers' records were compiled into a data base which was analyzed and discussed in detail by the combined working group. The combined working group concluded that mixed phase/glaciated conditions were a significant threat to engine operation, with rollback, flameout, stall and core damage symptomatic of some events. These conclusions resulted in a working group effort to define a mixed phase/glaciated icing environment, resulting in the proposed Part 33 Appendix D. This paper documents the process that led to the standards defined in that Appendix.
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