Development of a Runway Veer-Off Location Distribution Risk Assessment and Reporting Template (2014) / Chapter Skim
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78 A P P E N D I X D Runway Veer-Off Location Distribution Risk Assessment Model LRSARA User Guide Lateral Runway Safety Area Risk Analysis (LRSARA) Software User's Guide (V1.1)
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LRSARA User Guide 79 Disclaimer While every precaution has been taken in the preparation of this analysis tool, the Airport Cooperative Research Program (ACRP) and Airport Safety Management Consultants, LLC (ASMC)
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80 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template 2. System Requirements Component Requirement Computer and processor 1.0 gigahertz (GHz)
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LRSARA User Guide 81 If you want to install a new version to replace the existing one, you first need to remove LRSARA. To remove LRSARA, select Start/Control Panel in your desktop window.
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82 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template Fill the fields as shown in the example below and click Create Project. The project name cannot have spaces.
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LRSARA User Guide 83 7. Entering Data Defining Airport Conditions The following screen will appear when you select the Create Project button or when you select Input Data/Airport Characteristics in the main menu.
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84 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template Enter the specific characteristics of the airport, including the characteristics of the runways and available distances. Each of the fields and commands are described in the table that follows.
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LRSARA User Guide 85 For the Example Project, the information for runways 15 and 33 were entered and the following screen illustrates the example. Defining Lateral RSA Geometry and Obstacles Next, enter the RSA information, including the geometry and existing obstacles.
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86 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template The dropdown list includes all runways entered. In the example above, runway 15 is selected.
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LRSARA User Guide 87 In the figure, WS2 is the wingspan of the taxing aircraft and WS1 is the wingspan of the aircraft in the runway. The available lateral distance will be automatically calculated as follows: SOFAD = CS-RW 2-WS2 2 Where: • SOFAD is the lateral cleared distance available • CS is the runway/taxiway centerline separation • RW is the runway width • WS2 is the wingspan of the aircraft in the taxiway, usually characterized by the largest wingspan of the ADG of the airfield The lateral cleared distance available to the right and to the left are not necessarily the same.
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88 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template It is recommended that you name the file for the runways chosen, for instance, the example used here would be 15/33 RSA. Click Save and the Excel spreadsheet will open, as shown in the following screen.
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LRSARA User Guide 89 The area is automatically defined based on the runway distance available and the lateral distance available making up the RSA. Two types of obstacles may be evaluated in the analysis: ground obstacles and tall obstacles.
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90 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template Use the Excel menu to save the RSA geometry for Runway 15/33, and close the spreadsheet. The action will take you back to the RSA Geometric Layout screen.
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LRSARA User Guide 91 The screen allows the user to create, edit, import, or view the HOD required to run the analysis. Historical Weather Data (HWD)
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92 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template The screen allows the user to create, edit, import, or view the HWD required to run the analysis. The spreadsheet may be opened using LRSARA or directly in Excel and saved without changing the file name.
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LRSARA User Guide 93 You may edit, update, or add records by clicking the check box on the top left of the screen. Checking that box enables the fields for editing.
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94 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template This screen contains two tabs. The first shows the frequency models for landing veer-offs (LDVOs)
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LRSARA User Guide 95 9. Running the Analysis The analysis menu has four submenus: • Check Analysis Status • Run Full Analysis • Run Simplified Analysis • Output Missing Data Check Project Status The user may select Analysis/Check Project Status to check the status of calculations for one or more runways.
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96 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template You may run the analysis for individual runways or for all runways entered in the project. The selection is made on the top left of the screen, and if Run Individual Runway is selected, the list of runways is enabled for user selection.
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LRSARA User Guide 97 b. Tall Obstacle: the aircraft wingspan is used to estimate the probability of collision with the obstacle (e.g., buildings, fences, aircraft, vehicles, etc.)
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98 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template If the user selects Yes, an Excel spreadsheet will appear as shown below, showing the records with missing information. These records will be stored during the analysis and can be retrieved by the user at any time by clicking Analysis/Output Missing Data.
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LRSARA User Guide 99 In addition to checking missing data, LRSARA also checks inconsistencies in input data. The preliminary check is automated and is executed in the MS Excel templates used to create HOD and HWD.
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100 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template The user should correct the inconsistent data before running the risk analysis; otherwise the analysis will not be completed.
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LRSARA User Guide 101 The output file for the selected runway or all runways is created by clicking Create Output for Risk Analysis. The results are stored internally in the program.
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102 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template Results are presented in both tabular and graphical format. Each set of results contains the risk estimates for each type of incident and individual operation and the total risk during landings and takeoffs.
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LRSARA User Guide 103 The histogram shown in the Summary tab contains the probability data for each movement challenging the lateral RSA. Similar histograms for each individual type of operation (landing and takeoff)
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104 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template Again, it is necessary to create the output if this procedure has not been performed earlier. The user may select the type of output and click Open Existing Airport Summary to view the results in a spreadsheet as shown in the screen below.
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LRSARA User Guide 105 The tables are similar to those presented for individual runways, except that results for all types of incidents/accidents are consolidated and data for individual risk for any type of event are consolidated into the histogram. In addition, individual tables containing results for each runway are also presented.
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106 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template in the x-axis [e.g., approximately 20% of movements are subject to risk higher than 1.7E-07 (or one event in 5,880,000 movements)
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LRSARA User Guide 107 The next table presents the average number of years for one accident to occur if the operational conditions are similar during a long period of activity. Similar to the previous table, the results are provided by runway direction challenged by aircraft movements at the airport.
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108 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template Below is an example output for simplified analysis. For this case the probability of accident will depend only on the category of aircraft and no histogram of risk is generated.
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LRSARA User Guide 109 11. Help and Troubleshooting The last option in the main menu is Help.
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110 This section describes the procedure to prepare historical operations data for the airport. The historical operations data provided is consolidated internally in the program with the weather information provided (see Attachment B)
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LRSARA User Guide 111 To create the operations file, click on Create New Input File and a dialog box will open. Please enter a file name and the Excel spreadsheet will open with eight columns as shown below.
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112 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template Each line in the spreadsheet should correspond to one record. The following table contains a description of each field.
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LRSARA User Guide 113 An example of the template filled with the information needed to run the program is shown below.
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114 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template If the date and time format is not matching the format presented in the example above, the user may adjust by selecting the column, right-clicking, and selecting Format Cells. In the dialog box, select Date in the Category box and selecting 3/14/01 1:30 PM in the Type box, as shown in the screen below.
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115 This section describes the procedure to prepare historical weather data for the airport. The historical weather data provided are consolidated internally in the program with the historical operations information provided (see Attachment A)
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116 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template To create the weather file, click on Create New Input File and a dialog box will open. Please enter a file name and the Excel spreadsheet will open with nineteen columns as shown below.
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LRSARA User Guide 117 Each line in the spreadsheet should correspond to one record. The following table contains a description of each field.
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118 Development of a Runway Veer-Off Location Distribution Risk Assessment Model and Reporting Template Field Description Format Ice Pellets Same as sleet; defined as pellets of ice composed of frozen or mostly frozen raindrops or refrozen partially melted snowflakes. These pellets of ice usually bounce after hitting the ground or other hard surfaces.
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LRSARA User Guide 119 If the date and time format is not matching the format presented in the example above, the user may adjust by selecting the column, right-clicking and selecting Format Cells. In the dialog box, select Date in the Category box and selecting 3/14/01 1:30 PM in the Type box, as shown in the screen below.
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