By John D'Avirro; Michael D Chaput; National Research Council (U.S.). Transportation Research Board.; Airport Cooperative Research Program.; United States. Federal Aviation Administration
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Additional info for Optimizing the use of aircraft deicing and anti-icing fluids
Lakeeffect snow is produced in the winter when cold arctic winds move across long expanses of warmer lake water, providing energy and picking up water vapor, which freezes and is deposited on the lee shores. The areas surrounding lake-effect snow are called snow belts. As lake-effect snow can cause signiﬁcant variance in precipitation rates in small areas, it was of particular interest to examine the ability of a single HOTDS to provide sufﬁcient coverage at an airport site impacted by lake-effect snow.
This examination of statistical variance uses the F-distribution. If there is a signiﬁcant difference in statistical variance, then those test sets cannot be combined. For those test sets, a different statistical approach using separate variances t-test is applied. 05 signiﬁcance level. The tables are formatted by number of degrees of freedom for the numerator and denominator, with the highest number in the numerator. The number of degrees of freedom is the site test sample size minus 1 (nx − 1); Compare the calculated F-value to the table F-value; If the calculated F-value is less than the table F-value, then one can assume that the variances of the two sets are not signiﬁcantly different, and the data from the two sites can be combined for the t-test using the null hypothesis approach; and If the calculated F-value is greater than the table F-value, then the variances of the two sets are signiﬁcantly different, and the data from the two sites cannot be combined for the t-test.
S. Federal Aviation Administration, Washington, DC (10/27/2006). S. S. Federal Aviation Administration, Washington, DC (4/19/2007). S. S. S. Federal Aviation Administration, Washington, DC (5/30/ 1981). S. Federal Aviation Administration AWS-100, Hazards Following Ground Deicing and Ground Operations in Conditions Conducive to Aircraft Icing, Advisory Circular (AC) 20-117, Federal Aviation Administration, Washington, DC (reissued 3/29/1988). S. S. Federal Aviation Administration, Washington, DC, (9/30/1992).
Optimizing the use of aircraft deicing and anti-icing fluids by John D'Avirro; Michael D Chaput; National Research Council (U.S.). Transportation Research Board.; Airport Cooperative Research Program.; United States. Federal Aviation Administration