1.0 INTRODUCTION
    1.1 Purpose
    1.2 Scope
    1.3 Basis for Requirements
    1.4 Basis for Approval
    1.5 Basis for Continued Approval
    1.7 System of Units
    1.8 Applicable Documents
    1.9 Definitions
2.0 GENERAL INFORMATION
    2.1 Product Information
    2.2 Types
         2.2.1 Clapper Type
         2.2.2 Diaphragm Type
         2.2.3 Summary
    2.3 Approval Application Requirements
    2.4 Requirements for Samples for Examination
3.0 GENERAL REQUIREMENTS
    3.1 Review of Documentation
    3.2 Physical or Structural Features
    3.3 Design Requirements
    3.4 Operation
    3.5 Markings
    3.6 Materials and Construction
    3.7 Environment
    3.8 Serviceability and Parts Removal
    3.9 Instructions and Trim Equipment
    3.10 Clearances
    3.11 Calibration
    3.12 Tolerances
4.0 PERFORMANCE REQUIREMENTS
    4.1 Examination
    4.2 Operational Tests
    4.3 Friction Loss
    4.4 Body Hydrostatic Strength
    4.5 Clapper Strength
    4.6 Diaphragm Strength
    4.7 Bonding Adequacy
    4.8 Water Absorption
    4.9 Aging
    4.10 Additional Tests
5.0 OPERATIONS REQUIREMENTS
    5.1 Demonstrated Quality Control Program
    5.2 Facilities and Procedures Audit (F&PA)
    5.3 Installation Inspections
    5.4 Manufacturer's Responsibilities
    5.5 Manufacturing and Production Tests
         5.5.1 Test Requirement No. 1 - Seat Leakage Test
         5.5.2 Test Requirement No. 2 - Hydrostatic Test
         5.5.3 Test Requirement No. 3 - Operation Test
APPENDIX A: Units of Measurement
APPENDIX B: FM Approvals Certification Marks
APPENDIX C: Figures
APPENDIX D: Tolerance