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50 Chapter 6 Other Airport APM System Performance Measures This guidebook has been provided to identify a set of Average vehicle service miles per running tire; performance measures and associated data requirements for Average vehicle service miles per guidance tire; airport APM operators to assess and improve performance, Average cycles per drive cable (for cable-propulsion APMs); compare airport APM systems, and plan and design future MTBF or MTTR, ATC system: systems. The measures are intended to address the efficiency, MTBF or MTTR, automatic train operation (ATO) sub effectiveness, and quality of APM systems at airports. system; Thus far, the guidebook has set forth the measures to be used MTBF or MTTR, ATS subsystem; in comparing airport APM systems (i.e., external measures). MTBF or MTTR, ATP subsystem; These measures can also be used to assess and improve the MTBF or MTTR, traction power distribution system; and performance of an individual airport APM system and, MTBF or MTTR, guideway equipment system. therefore, can be used as internal measures as well. However, there are other internal measures that may be useful for assess The purpose of this chapter is not to provide a compre ing and improving the performance of an individual airport hensive list or detailed definition and requirements for these APM system that do not work as well as external measures. measures; rather it is to illustrate that the number and type of The following sections discuss these additional internal mea performance measures that could be implemented for inter sures as well as those to be used in the planning and design of nal measurement purposes are quite extensive. airport APM systems. Although operators of an airport APM system may choose to implement numerous performance measures, an effective performance measurement program should reflect a balanced 6.1Internal Measures for Assessing set of a few vital measures (see Section 4.2). More often than and Improving Performance not, airport APM system owners/operators implement these of Airport APM Systems few vital measures to represent performance of the entire Airport APM systems have varying characteristics and are system, but individual departments within the O&M organi made up of different technologies that can make it challenging zation will often track many other measures directly related to develop meaningful measures that are directly comparable and helpful to their discipline. Sometimes this involves the among airport APM systems. Chapter 5 set forth the measures temporary establishment of a performance measure due to that may be the best in achieving such comparisons. How an abnormally high failure rate of a particular component ever, there are many other performance measures that can be that may not have otherwise been the target for such a mea implemented by airport APM systems and that may be worth sure. For example, the vehicle maintenance department while to track for assessing and improving the internal perfor may be interested in understanding the wear rate of running mance of an individual airport APM system even though they tires so as to compare one manufacturer to another, or in un may not be worthwhile for comparisons among systems. derstanding why there are higher wear rates at a given time Some of the internal measures currently in use or that could (e.g., there could be a track condition causing this higher wear). be implemented at airport APM systems are: Or, there may be a component on an electronic circuit board failing in relatively large numbers after operating without Average vehicle service miles per collector shoe; incident for a number of years. In this case, implementing a Average vehicle service miles per traction motor; performance measure associated with this component would