Preliminary survey of icing conditions measured during routine transcontinental airline operation

Perkins, Porter J.

Icing data collected on routine operations by four DC-4-type transport aircraft equipped with NACA pressure-type icing-rate meters and flying over a transcontinental route from January through May 1951 are presented. The four aircraft were in icing conditions approximately 1-1/2 percent of the total flying time. Nearly one-half of the icing conditions were encountered over the Great Lakes area. Average liquid-water-content measurements did not exceed 1.0 gram per cubic meter and 80 percent of the measurements did not exceed 0.4 gram per cubic meter. The data are considered only preliminary and the program is continuing to provide additional data from world-wide air routes.

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