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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

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