Source: https://guthlabs.ai/docs/instruments/orbital-inclination-plane-change-v/implementation/

instrument implementation / implementation-contract

# Orbital Inclination Plane-Change Δv implementation

A source-bound implementation contract for Orbital Inclination Plane-Change Δv; 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**: t4-245

**Effect**: Computation or source lookup only

## Input and validation requirements

The extreme-magnitude vector can produce JavaScript Infinity because the intermediate multiplication 2·v overflows, even though the mathematically reordered result is finite. The branch vector also exposes that an inclination change above π needs explicit rejection or normalization, which is not specified.

## 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": {
    "orbital_velocity_km_s": 7.8,
    "inclination_change_deg": 60
  },
  "expected_outputs": {
    "delta_v_km_s": 7.8
  },
  "working": "Convert angle: 60° × π/180 = π/3 rad. Half-angle: (π/3)/2 = π/6. sin(π/6) = 0.5. Δv = 2 × 7.8 km/s × 0.5 = 7.8 km/s."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/orbital-inclination-plane-change-v/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/orbital-inclination-plane-change-v/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/orbital-inclination-plane-change-v/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-tranche4/tranche4-results.json`