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40 Figure 34. RSA risk assessment. The information on flights should be coupled with weather Between 2002 and 2004, a sample of historical data from an conditions obtained from the airport weather station. The rep- existing airport was gathered for this example. Data include resentative sample (e.g., 1 year) should contain the informa- landing operations for Runway 25, landing operations for tion on the parameters used in the frequency models (Table 7). Runway 07, and takeoff operations for Runway 07. In the Aircraft operations challenging the RSA at the runway end event of an incident, these flights may challenge the RSA for shown in Figure 35 are those arriving on Runway 25 (LDUSs) this example. or arriving and departing from Runway 07 (LDORs and TOORs). To run the analysis, a sample of the traffic landing Step 3--Define Crash Scenarios and taking off on Runway 07 and landing on Runway 25 is necessary. The sample must be representative of the existing This step still requires some judgment from the analyst. In or planned conditions for Runway 07/25. Preferably, the the example shown in Figure 35, the RSA adjacent to the Run- sample should cover at least 1 year of operations, but it may way 25 approach end is only 100 ft long by 500 ft wide. not be necessary to obtain data for each month. A sample When applying the risk assessment procedure to a partic- comprising at least 4 months of operations, but characteriz- ular RSA, it is important to recognize that not every RSA has ing the whole year should suffice (e.g., January, April, July, a standard or rectangular shape. In many cases, a combina- and October), such that different seasons, environmental tion of the shapes and sizes as well as obstacles may exist. conditions, and seasonal variations of traffic are represented. Other factors, such as the type of obstacle, will often need a Figure 35. RSA on approach end of Runway 25.