FAA-HDBK-006A-2008.pdf

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1/7/2008 FAA-HDBK-006A January 7, 2008 FEDERAL AVIATION ADMINISTRATION HANDBOOK Reliability, Maintainability, and Availability (RMA) HANDBOOK This handbook is for guidance only. Do not cite this document as a requirement. NOT MEASUREMENT SENSITIVE 1/7/2008 i FOREWORD 1. This is a new handbook. It is approved for use by the Federal Aviation Administration, Department of Transportation. It is also available for use by all other DOT agencies and their personnel. 2. This handbook covers the development of reliability, maintainability and availability (RMA) requirements for the National Airspace System (NAS). 3. This document will guide Service Units and acquisition managers in preparing procurement packages for major system acquisitions. RMA-related sections of these packages include Information for Proposal Preparation, System-Level Specifications, Statements of Work, and Data Item Descriptions. The handbook not only establishes RMA contractual requirements but also recommends comprehensive steps to ensure that fielded systems successfully comply with them. It provides guidance to help managers reduce NAS-Level requirements to levels of detail and characteristics that can readily be monitored and verified. Additionally, it recommends procedures to help managers evaluate proposals, monitor design development, and conduct effective tests and verifications. 4. Comments, suggestions, or questions on this document should be addressed to the Federal Aviation Administration, 800 Independence Ave., S.W., Washington, DC, 20591, System Engineering Office, NAS Requirements and Interface Management Division. 1/7/2008 ii CONTENTS PARAGRAPH PAGE FOREWORD. i 1 SCOPE. 8 2 APPLICABLE DOCUMENTS. 9 2.1 Government Documents. 9 2.1.1 Specifications, standards, and handbooks. 9 2.1.2 FAA Orders. 9 2.1.3 Other Government documents, drawings, and publications. 10 2.2 Non-Government Publications. 10 3 DEFINITIONS. 11 4 GENERAL GUIDANCE . 16 4.1 Purpose and Objectives. 16 4.1.1 Purpose of NAS-Level RMA Requirements. 16 4.1.2 Purpose of this Handbook. 17 4.2 Document Organization. 17 5 A NEW APPROACH . 19 5.1 The Traditional RMA Paradigm . 19 5.2 Agents of Change. 19 5.2.1 Technology and Requirements Driven Reliability Improvements. 20 5.2.2 Fundamental Statistical Limitations. 21 5.2.3 Use of Availability as a Contractual Specification. 24 5.2.4 RMA Issues for Software-Intensive Systems. 25 5.2.5 RMA Considerations for Systems Using COTS or NDI Hardware Elements . 25 5.3 The New Paradigm. 26 6 DERIVATION OF NAS-LEVEL RMA REQUIREMENTS . 28 6.1 Roll-up NAS-SR-1000 Criticalities. 28 6.1.1 Criticality Definitions. 29 6.1.2 Criticality Roll-up . 30 6.2 Map FAA Order 6040.15D Services to NAS-SR-1000 Service Threads. 32 6.2.1 Taxonomy of FAA Systems. 32 6.2.2 Categorization NAPRS Services. 34 6.3 Assess Service Thread Contribution . 40 6.4 Assign Service Thread Loss Severity Category (STLSC). 44 6.5 Assigning Availability Requirements to STLSCs. 46 6.6 STLSC Matrix Development . 47 6.6.1 Terminal Systems STLSC Matrix. 49 6.6.2 En Route STLSC Matrix. 52 6.6.3 “Other” Service Thread STLSC Matrix. 54 6.7 NAS-SR-1000 RMA Requirements. 56 6.7.1 Information Systems . 56 6.7.2 Remote/Distributed Service Threads. 58 6.7.3 Infrastructure Systems (Power Systems). 60 7 ACQUISITION STRATEGIES AND GUIDANCE. 62 7.1 Preliminary Requirements Analysis. 63 1/7/2008 iii 7.1.1 Taxonomy of FAA Systems and Associated Allocation Methods. 63 7.1.2 Analyzing Scheduled Downtime Requirements. 69 7.1.3 Modifications to STLSC Levels. 69 7.1.4 Redundancy and Fault Tolerance Requirements. 70 7.1.5 Preliminary Requirements Analysis Checklist. 70 7.2 Procurement Package Preparation. 71 7.2.1 System-Level Specification. 71 7.2.2 Statement of Work. 78 7.2.3 Information for Proposal Preparation. 83 7.3 Proposal Evaluation . 84 7.3.1 Reliability Modeling and Assessment. 84 7.3.2 Fault-Tolerant Design Evaluation. 84 7.3.3 Performance Modeling and Assessment . 85 7.4 Contractor Design Monitoring. 85 7.4.1 Formal Design Reviews. 85 7.4.2 Technical Interchange Meetings . 85 7.4.3 Risk Management. 85 7.5 Design Validation and Acceptance Testing . 88 7.5.1 Fault Tolerance Diagnostic Testing . 88 7.5.2 Functional Testing. 89 7.5.3 Reliability Growth Testing. 89 8 NAS-SR-1000 MAINTENANCE. 91 8.1 Revising Service Thread Requirements. 91 8.2 Adding a New Service Thread. 91 9 RMA REQUIREMENTS ASSESSMENT . 93 9.1 Requirements Analysis. 96 9.2 Architecture Assessment. 97 10 NOTES. 99 10.1 Updating this Handbook. 99 10.2 Bibliography. 99 10.3 Other Notes. 100 Appendix A SAMPLE REQUIREMENTS. A-1 A.1 System Quality Factors. A-1 A.2 System Design Characteristics. A-2 A.3 System Operations . A-3 Appendix B RELIABILITY AND AVAILABILITY TABLES FOR REPAIRABLE REDUNDANT SYSTEMS.B-1 B.1 Availability Table.B-1 B.2 Mean Time between Failure (MTBF) Graphs.B-1 Appendix C STATISTICAL METHODS AND LIMITATIONS.C-1 C.1 Reliability Modeling and Prediction.C-1 C.2 Maintainability.C-2 C.3 Availability.C-2 C.4 Mod
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