Arrivals to 18L and 17C.
Black lines mark the position of gates.
Figure 2 South Flow arrivals on 18L and 17C showing the location of virtual gates
STATISTICAL EVALUATION OF FLIGHT DATA
This section evaluates the flight path and aircraft height where it crosses the centerline of the PT
at a distance of 2,650 feet from the end of the runway on the north and south sides using actual
flight data obtained from DFW/EAD. This is the first time a research analysis has attempted to
establish the height of an aircraft over the PT centerline of a runway during the arrival and
departure state for an airport using real time historical data. Individual dates are analyzed for
South Flow flights arriving on runways 17C and 18R and for North Flow arriving on runways
35C and 36L. The data for all five selected dates is analyzed to determine the maximum,
minimum, mean, median, mode, standard deviation, standard error, and average variation of the
aircraft height above the centerline of the PT, which is planned to be 2,650 feet from the end of
the runway. In the statistical analysis, the outliers are not eliminated while performing the test to
determine the distribution of the observed height data. The number of outliers is small and they
are all well above the minimum height over the PT specified by the FAA and their removal
appeared to have a minimal affect on the safety analysis undertaken in this section. A Chi-
square goodness-of-fit test is performed to determine if the observed data matches a normal
distribution.
Satyamurti and Mattingly
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