SBAS Knowledge Base

ResearchLog 2026-05-02 Integrity Learning Path Upgrade

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ResearchLog 2026-05-02 Integrity Learning Path Upgrade

Scope

This cycle upgraded the SBAS integrity learning path into a more institutional-grade documentation layer.

Primary focus:

The cycle did not verify exact numerical thresholds against primary standards. Instead, it removed or quarantined unsupported operational numbers and replaced them with source-disciplined conceptual explanations suitable for public institutional reading.

Safety and baseline

  • A private pre-change backup was created before editing the published Quartz content root.
  • The repository baseline was clean before edits.
  • The active content root remained the canonical Quartz content directory.

Files substantially upgraded

  • Concepts/SBAS Integrity.md
  • Concepts/Protection Levels.md
  • Concepts/Alert Limits.md
  • Aviation/LPV-Approach-Procedure.md

Files patched

  • MOCs/SBAS-in-Civil-Aviation-MOC.md

Documentation-quality decisions

Integrity page

SBAS Integrity was rewritten as the top-level safety-function concept page. It now clearly distinguishes accuracy from integrity and explains that SBAS must support use-or-non-use decisions, not merely improve estimated position.

Protection-level page

Protection Levels was rewritten as the bounded-error concept page. It now explains that a protection level is not actual error and should not be confused with an accuracy estimate.

Alert-limit page

Alert Limits was rewritten as the operation-specific threshold concept page. It now explains the relationship between protection levels and alert limits without publishing unsourced values.

LPV page

LPV-Approach-Procedure was converted from an overconfident procedure-style draft into a source-disciplined institutional learning page. Unsupported numerical performance values, generic minima, training-hour claims, cost estimates, and benefit percentages were removed from the authoritative narrative.

Civil aviation MOC

SBAS in Civil Aviation MOC was patched to reflect the upgraded editorial maturity of the integrity path and LPV page.

Source and verification boundary

All upgraded pages remain source-scaffold-linked. They are now suitable as high-quality public learning pages, but they are not verified operational requirements tables.

Relevant source scaffolds remain:

The next high-value cycle should create a source-backed standards matrix for the integrity path:

  1. verify exact metadata and scope for Source - RTCA DO-229;
  2. verify exact metadata and scope for Source - RTCA DO-242;
  3. verify whether Source - ICAO Doc 9855 or Source - ICAO Doc 9854 is the correct anchor for each architecture, integrity, and testing claim;
  4. add a comparison table showing which claims are airborne-equipment, system-level, procedure-design, regulator/ANSP, or service-provider claims;
  5. only then reintroduce any numerical values into LPV-Approach-Procedure.

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