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Because of the diversity of GA airports, aircraft,  and flight operations, and the varied threats and vulnerabilities posed by different sectors of the GA industry, a logical starting point in mitigating security risk would be to perform systematic risk analyses or security risk assessments examining specific components of GA.  The FY2006 Department of Homeland Security Appropriations Act (P.L. 109-90) contains a provision requiring the DHS to examine the vulnerability of high-risk areas and facilities to possible attack from GA aircraft.  This mandate focuses on the specific vulnerability of critical infrastructure to attack,  which relates more closely to the threat to critical infrastructure and other significant sites posed by GA aircraft as discussed in this report.  In this report vulnerability has referred instead to the specific weaknesses in security measures to protect GA airports and aircraft that could be exploited to gain unauthorized access to facilities and aircraft.  A comprehensive risk assessment and risk mitigation strategy would likely take into account both the threat and vulnerability associated with GA operations as well as the potential cost of consequences associated with possible terrorist attack scenarios.
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.
　
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