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To view this page ensure that Adobe Flash Player version 9.0.124 or greater is installed. Security Risk Assessments Security risk can be viewed as a function of: 1) the threat or threats posed by a specific type of flight operation or activity measured in terms that attempt to quantify the probability of various terrorist attack scenarios; 2) the vulnerability or susceptibility of existing security weaknesses measured in probabilistic terms reflecting the likelihood that they could be exploited by terrorists; and 3) the possible consequences measured in terms of predicted damage or associated cost. Using this risk analysis framework, the relative effectiveness of mitigation options can be evaluated in terms of how specific security enhancements might reduce vulnerability and how resources could be allocated in a manner to mitigate threats based on their likelihood and their potential consequences. The anticipated risk reduction can then be compared to expected costs in an attempt to determine the most cost effective strategies for enhancing GA security. For passenger airline operations, a layered approach to aviation security has been implemented. This layered system includes passenger name checks against watch lists, passenger and baggage screening, access controls at airports, hardened cockpit doors, and armed air marshals and pilots on passenger airlines. The layered approach has a unique advantage in reducing vulnerability by adding additional safeguards to foil terrorists, thereby greatly reducing the overall vulnerability of the entire system. In probabilistic terms, the vulnerability of the entire security system is the combined or joint probability that each individual layer could be breached or circumvented. Thus, while the threat of terrorism still exists, most experts would agree that, in the case of passenger airlines, the risk of terrorism has been significantly mitigated by greatly reducing the vulnerability that security weaknesses could be exploited by terrorists through the implementation of a multi-layered security system. In the case of GA, a systematic examination of security risk has not been completed. However, many experts acknowledge that various security vulnerabilities and threats exist. An analysis of GA security by the International Civil Aviation Organization (ICAO) concluded, “[t]he challenge of designing general aviation security measures focuses on the need to thoroughly define the threat. Before security standards can be developed, there must be a clear picture of the problem.”48 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：Securing General Aviation 通用航空安保(25) |
