At the airfield in hub airports, many activities occur that involve a range of participants, including various-size aircraft, ground vehicles, and workers. The safety management system is FAA's approach for systematically managing aviation safety. A major component of the safety management system is safety risk management (SRM), which entails analysis, assessment, and control of safety risks, including risks on the airfield. Current SRM has few specific safety models to estimate the likelihood or frequency of risks. This paper presents an example for development and incorporation of safety models into SRM. Specifically, it discusses safety models for runway incursion that use the following variables: total and general aviation operations, length of runway by type, number of taxiway intersections, snowfall, precipitation, number of hot spots, and construction activity. Categorization and processing of data were significant because each variable used could take on multiple forms, and some types of data involved review of airfield diagrams. The data used were from 137 U.S. hub airports for 2009 through 2014. For modeling, the negative multinomial distribution was used because it proved suitable for representing overdispersed data such as runway incursion frequency. Performance of the models was assessed through the goodness-of-fit measures of log likelihood, overdispersion, and cumulative residual plots. Models were developed for five severity categories of runway incursions and three types of surface events. The safety modeling approach presented here can serve as a foundation for development of other safety models that can be integrated into SRM to enable quantitative analysis of safety risks.The safety management system (SMS) is a formalized and proactive approach to system safety that directly supports the FAA's mission to provide the safest and most efficient aerospace system. SMS is an integrated set of processes consisting of four components: safety policy, safety assurance, safety promotion, and safety risk management (SRM). SRM describes the system; identifies the hazards; and analyzes, assesses, and controls risk (1). SRM requires specific quantitative measures to determine risk likelihood. For instance, the expected number of runway incursions in a system is a crucial measure for runway safety analysis. This paper proposes the enhancement of SRM with quantitative models of the frequency of runway incursions as a function of airport geometry, operations, construction activity, and weather variables. The most important components of SRM are summarized to illustrate the application of the models. In addition, a review of current aviation safety modeling is presented.
Description of srMSRM safety analysis is divided into five phases that apply to activities such as operations, maintenance, procedures, or equipment development: Phase 1, describing the system; Phase 2, identifying hazards; Phase 3, analyzing risk; Phase 4, assessing risk; and Phase 5, treating risk. phase 1. Describing the system Describing th...