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30 Figure 38. RSA characterization using Microsoft Excel. canvas template. The user assigns a letter or number to each cell Each folder contains the risk estimates for each type of to define the type of surface or category of obstacle. After enter- incident and individual operation and the total risk during ing a code, the color of the cell will change according to the sur- landings and takeoffs. The results for each individual runway face type or obstacle entered to facilitate the visualization of the are provided in separate output Excel files. The summary drawing. Tables with the codes describing the surface types and table provides the average risk for each type of accident and obstacles available are provided in the template. Figure 38 expected number of years for an accident to occur. The accu- shows an example of RSA defined with the tool. mulated risk distribution is provided in graphical form for each section of the RSA. The results for the entire airport are provided in one output Output and Interpretation Excel file. The user must create the output files for each runway When the analyses are completed, the user may see the results prior to creating the output file for the airport. An example pre- using the Output option of the main menu. There are two senting the summary of results for the whole airport is shown types of results: runways or the consolidated results for the in Figure 39. The main table contains a summary of average risk whole airport. Within each of these options, the user can view levels for each type of incident and for all incidents. Risk levels the results for risk of events taking place outside the RSA or are shown in terms of accident rates per number of operations view the analysis output for the risk of accidents. and expected number of years to occur one accident. Additional