Source: https://guthlabs.ai/docs/instruments/airspeed-converter-ias-cas-tas-eas/implementation/

instrument implementation / implementation-contract

# Airspeed Converter (IAS/CAS/TAS/EAS) implementation

A source-bound implementation contract for Airspeed Converter (IAS/CAS/TAS/EAS); deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t6-065

**Effect**: Computation or source lookup only

## Input and validation requirements

A temperature deviation of -288.15 K at sea level makes the absolute temperature exactly zero, causing the density denominator R*T to vanish. The converter should reject the input; any numeric output would be erroneous.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "input_type": "CAS",
    "CAS_kt": 100,
    "altitude_m": 0,
    "temperature_deviation_K": 0,
    "model": "incompressible approximation",
    "assumptions": "IAS=CAS; sigma=1"
  },
  "expected_outputs": {
    "CAS_kt": 100,
    "EAS_kt": 100,
    "TAS_kt": 100,
    "density_ratio_sigma": 1
  },
  "working": "At sea level, sigma=rho/rho0=1. EAS=TAS*sqrt(sigma)=100*sqrt(1)=100 kt. TAS=CAS/sqrt(sigma)=100/sqrt(1)=100 kt. Therefore CAS=100 kt, EAS=100 kt, TAS=100 kt."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/airspeed-converter-ias-cas-tas-eas/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/airspeed-converter-ias-cas-tas-eas/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/airspeed-converter-ias-cas-tas-eas/qualification/>)

## Sources and evidence

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

- `VERIFIED_LEDGER.json`

- `evidence-tranche6/tranche6-results.json`