Source: https://guthlabs.ai/docs/instruments/converging-diverging-nozzle-area-ratio-calculator/qualification/

instrument qualification / verified-with-binding-errata

# Converging-Diverging Nozzle Area-Ratio Calculator qualification

Verified with errata that must be applied at binding time.

Status: **VERIFIED_WITH_ERRATA**Lifecycle: **verified-with-binding-errata**

## Ledger verdict

Verified with errata that must be applied at binding time.

**Status**: VERIFIED_WITH_ERRATA

**Tranche**: tranche-6

**Review vectors**: 4

**Ledger rows**: 1

## Applied errata

````
[
  {
    "vector": "1,2,3",
    "field": "critical_choking_pressure_ratio_Pb_over_P0",
    "wrong": 0.528282,
    "correct": "0.93716 for AR=2 (p at the subsonic-exit solution; per-AR for others)",
    "cause": "ships the throat ratio (2/(g+1))^(g/(g-1)) as the choking BACK pressure — the classic misconception; a C-D nozzle chokes when Pb drops below the subsonic-branch exit pressure, not p*/P0 (v4 with AR=1 coincidentally agrees)"
  }
]
````

## Adversarial re-test context

The full catalog was re-tested from boundary, convention, and self-check angles in 2,787 requests. Five genuine computational defects were independently verified and corrected. This page reports the current ledger state for this instrument; it does not imply product deployment or interface qualification.

## Release gate

Bind every attached correction, replay the affected vectors, enforce boundary validation, and preserve evidence before describing the executable surface as qualified.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/converging-diverging-nozzle-area-ratio-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/converging-diverging-nozzle-area-ratio-calculator/mechanism/>)[03**Implementation**](<https://guthlabs.ai/docs/instruments/converging-diverging-nozzle-area-ratio-calculator/implementation/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `STRESS_TEST_RECEIPT.json`

- `tranche errata record`