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28 CHAPTER 5 Analysis Software Overview Average risk for each type of incident by runway, by RSA section, and total for the airport. One of the main project goals was to develop an analysis The expected number of years to occur an accident for tool to incorporate the approach and the models developed a user-defined annual traffic volume and growth rate. in this study. The software is called Runway Safety Area Risk Percentage of operations subject to a probability higher Analysis (RSARA). The program and the accompanying user's than a user-defined target level of safety (TLS). guide are available on the accompany CD with this report. In Graphical outputs with the distribution of risk for each addition, the user's guide is available in Appendix I. RSA and each type of event. RSARA is a Windows-based system developed to facilitate characterizing analysis conditions and entering required data. The software main screen is shown in Figure 36. Input Data Input data required to run the analysis include the follow- Software Capabilities ing information: RSARA was tailored to help airport stakeholders evaluate Sample of historical operations data (date and time, aircraft different RSA alternatives. The software has the following model, runway used, type of operation, etc.). capabilities: Sample of historical weather data for the airport covering the period of sample of historical operations (wind, tem- Performs full risk assessment for multiple runways. perature, precipitation, visibility, etc.). Enters multiple obstacles to each RSA scenario. Characteristics of runways (elevation, direction, declared Characterizes different categories for obstacles. distances). Defines and analyzes non-standard (non-rectangular) RSA Characteristics of RSAs (geometry, type of surface, pres- geometry. ence of EMAS, location, size and category of obstacles). Analyzes with standard and non-standard EMAS beds. General information (airport annual traffic volume, annual Internally integrates operations and weather data from growth rate). separate files. Automatically converts operations and weather data into Much of the input information is arranged in table format. parameters used by probability models. Operations and weather data are entered using Microsoft Excel Includes database of aircraft with capability to add new or templates with automatic checks for value ranges and data edit existing aircraft. format. Figure 37 shows the program screen and template to Automatically computes runway criticality factor for each input operations data. operation. The template for drawing the RSA area for overrun and un- Automatically corrects for required distances (landing and dershoot was created using Microsoft Excel. It consists of a can- takeoff) based on elevation, temperature, wind, and runway vas area formed by a matrix of cells. Each cell corresponds to a surface condition. coordinate that is referenced to the center of the runway. The Generates analysis reports from software with summaries default coordinate grid is set at 10 10 ft. If the RSA is larger of following parameters: than the available canvas, a new scale can be set at the top of the

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29 Figure 36. RSARA--main program screen. Figure 37. Example of input screen and template.