Source - RTCA DO-242
Scope of this note
This note preserves a provenance correction. Earlier vault drafts treated RTCA DO-242 as if it were a GNSS augmentation-system or SBAS integrity source. Public catalog signals reviewed in this cycle instead identify RTCA DO-242 as an ADS-B / surveillance-related standard.
Important boundary:
- This note is not a completed extraction from the RTCA document itself.
- The public-catalog signal is strong enough to flag the previous SBAS use as likely mis-scoped.
- Do not use DO-242 as a source anchor for SBAS integrity, LPV, protection levels, alert limits, or augmentation-system requirements unless a later direct source review proves a specific relevant linkage.
Public-catalog identity signal
| Field | Current public-catalog signal |
|---|---|
| Issuing body | RTCA, Inc. |
| Document | DO-242 / change to DO-242A in the consulted catalog signal |
| Public title signal | Minimum Aviation System Performance Standards for Automatic Dependent Surveillance Broadcast (ADS-B) |
| Publication-date signal | 2006-12-13 for the cataloged current change item |
| Scope signal | Clarifies ADS-B transmitted-position-quality parameters |
| SBAS relevance signal | Not identified as an SBAS augmentation-system standard in the reviewed public catalog material |
Provenance correction
Previous in-vault wording described DO-242 as a GNSS augmentation systems reference. That wording should be treated as superseded by this correction until direct-source review shows otherwise.
Recommended replacement behavior:
- For airborne GPS/SBAS equipment claims, use Source - RTCA DO-229.
- For GNSS implementation guidance, use Source - ICAO Doc 9849 with Annex 10 / regulator sources still required for normative claims.
- For system-level SBAS SARPs or service-definition claims, create or verify Annex 10, service-provider, and regulator source notes.
- For ADS-B position-quality or surveillance applications, retain DO-242 only as a possible surveillance-system source family, not as an SBAS source.
Downstream cleanup targets
The following pages should avoid presenting DO-242 as an SBAS integrity or augmentation-system authority:
- SBAS-Standards-Regulation
- SBAS Standards Source Matrix
- SBAS-vs-Other-Standards
- SBAS-vs-Other-Augmentation-Methods
- SBAS Integrity
- Protection Levels
- Alert Limits
- LPV-Approach-Procedure
- SBAS in Civil Aviation MOC
- SBAS Source Backlog
What remains uncertain
- Whether older working groups, related RTCA documents, or secondary citations created the initial in-vault confusion.
- Whether a different RTCA document number, not DO-242, was intended as the SBAS augmentation-system anchor.
- Which exact RTCA/EUROCAE/ICAO source should anchor each remaining system-level SBAS claim.