Reliability Issues for DOD Systems: Report of a Workshop

National Academies of Sciences, Engineering, and Medicine. 2002. Reliability Issues for DOD Systems: Report of a Workshop. Washington, DC: The National Academies Press. https://doi.org/10.17226/10561.

The final report of the National Research Council's (NRC) Panel on Statistical Methods for Testing and Evaluating Defense Systems (National Research Council, 1998) was intended to provide broad advice to the U.S. Department of Defense (DoD) on current statistical methods and principles that could be applied to the developmental and operational testing and evaluation of defense systems. To that end, the report contained chapters on the use of testing as a tool of system development; current methods of experimental design; evaluation methods; methods for testing and assessing reliability, availability, and maintainability; software development and testing; and validation of modeling and simulation for use in operational test and evaluation. While the examination of such a wide variety of topics was useful in helping DoD understand the breadth of problems for which statistical methods could be applied and providing direction as to how the methods currently used could be improved, there was, quite naturally, a lack of detail in each area.

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To address the need for further detail, two DoD agencies-the Office of the Director of Operational Test and Evaluation and the Office of the Under Secretary of Defense for Acquisition, Technology, and Logistics-asked the NRC's Committee on National Statistics to initiate a series of workshops on statistical issues relevant to defense acquisition. The aim of each workshop is to inform DoD about the methods that represent the statistical state of the art and, through interactions of the statistical and defense communities, explore their relevance for DoD application.

National Academies of Sciences, Engineering, and Medicine. 2002. Reliability Issues for DOD Systems: Report of a Workshop. Washington, DC: The National Academies Press. https://doi.org/10.17226/10561.

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Component Maintenance Manuals

Guidelines for Transitioning to S1000D

Maintenance Publications

European Aviation Safety Agency

January 2010 ”What” are Instructions for Continued Airworthiness ? 1

“What” are Instructions for Continued Airworthiness, ICA?

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Rulemaking Workshop, Cologne, January 2010

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Digital twins are virtual representations of subsystems within a system of systems. They can be utilized to model and predict performance and condition degradation throughout a system’s life cycle. Condition based mainte-nance, or the performance of system maintenance based on the subsystem states, is often facilitated by the implementation of digital twins. An open challenge is selecting the subsystems that require digital twins. We establish a generic process for determining a set of priority-based system components requiring digital twin development for condition based maintenance purposes. The priority set, which we term the “triage” set, rep-resents the set of components that when monitored through a digital twin lead to the greatest increase in total system reliability and simultaneously represent the minimal cost set of components for implementing a digital twin. While we focus our process on an unmanned underwater vehicle (UUV), where we frame the design problem as a multiobjective optimization problem utilizing experimentally determined data and metrics from the model of a real UUV system, the process is generic enough that it could be utilized by any system looking at cost and reliability estimates for leveraging digital twin technology.

S&C Electric Company’s “2021 State of Commercial and Industrial Power Reliability Report,”

researched in collaboration with Frost & Sullivan, focuses on U.S. commercial and industrial (C&I)

companies and their perspectives on power reliability. This report gauges the companies’ present

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reliability experiences, the impacts of poor reliability on their organizations, and their preferences and

expectations for improving power reliability.

The 253 companies surveyed have average yearly revenues of $2.8 billion—constituting key C&I

companies across various industries. These business sizes and industries represent utilities’ most

ambitious customers, with growing needs for continuous, reliable, and high-quality power.

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S&C Electric Company’s “2019 State of Commercial and Industrial Power Reliability Report,” researched

and written in collaboration with Frost & Sullivan, is the second annual foray into identifying, defining, and

understanding critical aspects of grid power reliability experienced by the commercial and industrial (C&I)

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business sector in the United States. The survey attempts to gauge their expectations of electric power as

well as the impacts of and resources around electric power outages.

Last year’s report uncovered that, although C&I businesses claimed to be content with their power

provider, their behaviors of implementing on-site alternative energy resources indicated otherwise—

and they readily admitted power reliability was a concern. The 2019 report aimed to better understand

the motivations and triggers for taking action on the concerns and decisions uncovered in last year’s

initial findings.

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In S&C Electric Company’s first “State of Commercial & Industrial Power Reliability” report, conducted

in collaboration with Frost & Sullivan, facilities and energy managers of commercial and industrial (C&I)

businesses across the United States were surveyed regarding their perspectives on power reliability

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and future energy needs.

Averaging $4 billion in revenue, these companies comprise the majority of the metered revenue for the

utilities serving them. Respondents’ opinions authentically portray the industry’s current conditions,

and their long-term needs heavily influence the future grid.

These respondents are the key decision-makers who select electricity commodity suppliers across

the Manufacturing, Data Center, Healthcare, Small Franchise, and Education sectors. They were

screened and selected according to their relevance and authority to make power-related decisions

and, consequently, 76% come from facilities management, corporate management, or operations. Their

companies represent a balance in size, with their monthly energy consumption ranging from 10 MWh

to more than 50 MWh. In total, the 251 survey respondents were pulled equally from the four census

regions of the United States, and along with their targeted job function, they make up a statistically

significant sample size that depicts the true state of C&I reliability.

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Federal Aviation Administration Safety Risk Management Guidance: SRM Tools

AVP-300-005-JA3

Purpose

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The purpose of this document is to provide guidance on tools and techniques that can be used for each step of the Safety Risk Management (SRM) process (System Analysis; Identify Hazards; Analyze Safety Risk; Assess Safety Risk; Control Safety Risk).

Scope

This guidance applies to all Federal Aviation Administration (FAA) organizations involved in conducting SRM.

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