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.

As of 8 Jul 2024, an electronic copy is available for 225 USD at: https://my.rtca.org/productdetails?id=a1B36000001Ick1EAC.

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 ()

See also
Automatic Dependent Surveillance-Broadcast
DO-212, Minimum Operational Performance Standards for Airborne ADS Equipment
DO-185A, Minimum Operational Performance Standards for Traffic Alert and Collision Avoidance System (TCAS) Airborne Equipment
DO-184, Traffic Alert Collision Avoidance System (TCAS) I Functional Guidelines
DO-236A, Minimum Aviation System Performance Standards: Required Navigation Performance for Area Navigation
DO-243, Guidance for Initial Implementation of Cockpit Display of Traffic Information
DO-229D, Minimum Operational Performance Standards for Global Positioning System/Wide Area Augmentation System Airborne Equipment
DO-260, Minimum Operational Performance Standards for 1090 MHz Automatic Dependent Surveillance - Broadcast (ADS-B)
DO-259, Application Descriptions for Initial Cockpit Display of Traffic Information (CDTI) Applications
DO-246B, GNSS-Based Precision Approach Local Area Augmentation System (LAAS) Signal-in-Space Interface Control Document (ICD)
DO-253, Minimum Operational Performance Standards for GPS Local Area Augmentation System Airborne Equipment
DO-245, Minimum Aviation System Performance Standards for the Local Area Augmentation System (LAAS)

RTCA standards
Aviation standards