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34 CHAPTER 4 Review and Documentation of FAA Parameters 4.1. Relevant Literature The performance requirements, as set forward by the FAA, combined with the site constraints, would drive the Of the documents reviewed, those most relevant to deter- selection of an appropriate arrestor type for the facility. mining the basis of FAA parameters governing the arrest of For civil applications, there is currently only one EMAS civil aircraft are as follows: option; however, this could broaden upon approval of other alternatives. AC 150/5220-9a. Aircraft Arresting Systems on Civil Airports. Given the performance requirements of the standards and FAA, 2006. the site constraints, the specific arrestor design for the facility AC 150/5220-22a. Engineered Materials Arresting Systems would be determined. This final system design determines the (EMAS) for Aircraft Overruns. FAA, 2005. cost for the system installation. The arrestor type determines Order 5200.9. Financial Feasibility and Equivalency of Runway the nature of the maintenance and repairs required, directly Safety Area Improvements and Engineered Material Arresting affecting those cost components. The arrestor type also has the Systems. FAA, 2004. most substantial impact on the installation time, service life, Order 5200.8. Runway Safety Area Program. FAA, 1999. and downtime during repairs. The particular specifications Runway Safety Area Status Database. FAA, 2007. of the installed system do not have a great effect on the time components. 4.2. Parameter Diagram From a regulatory standpoint, the performance requirements put forward by the FAA regarding exit speeds and the post- Figure 4-1 illustrates the FAA parameters governing civil event aircraft condition (permissible level of damage) have aircraft arrestors. Parameters specifically cited in the EMAS the most tangible impact on system cost. While other factors advisory circular (or elsewhere) are shown with underscores. may affect cost as well, the connectivity is more difficult to At the most general level, the parameters were categorized quantify. Chapter 5 demonstrates the cost impact of these as either inputs or outputs. Many of the inputs listed are parameters. essentially requirements, and these requirements can apply to Figure 4-3 illustrates the parameter relationships for an the initial or final conditions of an arresting event. The man- overrun event. Within this context, design considerations are ner in which the FAA drafts its requirements will govern the no longer relevant. The diagram assumes that all design deci- outputs: arrestor cost, size, performance, and so on. As such, sions were previously made and that an arrestor system has one could summarize by saying that the inputs are requirements been installed at the facility. and the outputs are consequences of the requirements. Changes During an arresting event, the initial conditions (upper left) in the requirements will have an impact on system cost, the of the aircraft type, exit speed, etc., interact with the arrestor manner of the arrestor function, and so on. system to produce a performance output. The arrestor trans- lates the overrun conditions into deceleration loads on the plane, an overall stopping distance, etc. 4.3. Parameter Relationships The arrestor type and specifications will impact the Figure 4-2 illustrates a detailed version of the prior param- performance significantly. As the research later shows, dif- eter diagram, showing the relationships from a standpoint of ferent arrestor types have different inherent performance designing and installing an arrestor. capabilities.