Articles with tag: "Appendix C"

1. Seeking "Icing Information Notes"

   

   Although horizontal extent is a common term in the icing literature, it has not been defined anywhere. Therefore, it is defined here in a way that is compatible with conventional usage.

   Public Domain figure and text from DOT/FAA/AR-07/4, which are similar to one of the Notes. ¹

   Summary

   Dr. Richard Jeck, retired from the FAA, passed away in January 2026. ²

   I am putting together a series on Dr. Jeck's works (He had over 60 technical publications, so this may take a while).

   Circa 1997, Jeck started circulating "Icing Information Notes" ["Notes"] ³:

   "in response to requests from the field or to clarify known areas of confusion in the interpretation and application of icing data and technical literature."

   They were available on request.

   He apparently wrote them until 2012, and there appear to have been over 30 in total.

   I am seeking if anyone asked for and …

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2. Estimating Icing Conditions with Highest Drag

   "These data will be useful in evaluating and formulating ice accretion analyses and also performance penalty predictions."

   from NASA-TM-83556.

   

   Summary

   In "Ice Shape Drag Correlations" a correlation of drag due to icing was detailed using data from NASA-TM-83556 ¹. Here, we use the correlation to predict or estimate which icing conditions can result in the highest drag.

   The icing conditions predicted to have the highest Cd values cluster in a limited range of Figures 1 and 2 of Appendix C ², even when wide ranges of airspeed and altitude are considered.

   The Appendix C, Figure 1 Icing Environment

   We will use the Appendix C Continuous Maximum Icing Conditions.

   Appendix C Figure 1 defines LWC as a function of water drop size MVD (noted as "Median Effective Drop Diameter").

   
   Public Domain image.

   There is a standard horizontal extent of 17.4 nmi. defined that will be used here.

   A true airspeed …

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