DO-242A
# DO-242A

DO-242A is an aviation system standard published by RTCA, Incorporated. It contains minimum aviation system performance standards (MASPS) for Automatic Dependent Surveillance-Broadcast (ADS-B). These standards specify operational characteristics that should be useful to designers, manufacturers, installers, service providers and users of an ADS-B system intended for operational use on an international basis. DO-242A provides a view of the system-wide operational use of ADS-B, but does not describe a specific technical implementation or design architecture meeting these operational and technical characteristics.

## Outline of contents

* Purpose and Scope
   * Introduction
   * System Overview
   * Operational Applications
   * Verification Procedures
* Operational Requirements
   * General Requirements
   * System Performance - Standard Operational Conditions
* ADS-B System Definition and Functional Requirements
   * System Scope and Definition of Terms
   * ADS-B System Description
   * System Requirements
   * ADS-B Messages and Reports
   * ADS-B Subsystem Requirements
   * ADS-B Functional Level Requirements
* Procedures for Requirement Verification
* Appendix A: Acronyms
* Appendix B: Definition of Terms
* Appendix C: Bibliography and References
* Appendix D: Near-Term ADS-B Applications
* Appendix E: Other Applications
* Appendix F: Efficient Spectrum Utilization
* Appendix G: Design Tradeoff Considerations
* Appendix H: Receive Antenna Coverage Constraints
* Appendix I: Integrity Considerations for ADS-B Applications
* Appendix J: Accuracy and Update Period Analysis
* Appendix K: Latency and Report Time Error Data
* Appendix L: Track Acquisition and Maintenance Requirements
* Appendix M: Examples of On-Condition Report Formats
* Appendix N: Intent Guidance Material for Future ADS-B Intent Broadcast
* Appendix O: Determination of Intent Information Exchange Requirements for Air-Air Encounter Alerting and De-Confliction
* Appendix Q: Future Air-Referenced Velocity (ARV) Broadcast Conditions
* Appendix R: Determining the Navigation Accuracy Category for Velocity ($\mathrm {NAC} _{v}$)
