{
  "title": "Fictional CubeSat payload power change: inspectable engineering example",
  "version": "1.0",
  "published": "2026-09-05",
  "status": "Illustrative educational dataset, not flight design data, a customer result or measured Arc product output.",
  "programme": {
    "name": "Illustrative 6U Earth-observation CubeSat",
    "baseline": "BL-03",
    "operating_point": "Simplified simultaneous peak-load allocation; all other loads and available power fixed.",
    "assumptions": [
      "Numbers are invented for explanation.",
      "The same duty cycle is used before and after the proposed change.",
      "Bus voltage, transients, thermal response, battery life, power conditioning efficiency and operational scheduling require separate engineering analysis."
    ]
  },
  "records": [
    {
      "id": "PAY-PWR-014",
      "type": "requirement",
      "revision": "B",
      "baseline": "BL-03",
      "status": "current illustrative baseline",
      "text": "The payload peak electrical power shall not exceed 20 W at the defined operating point.",
      "allocated_cap_W": 20,
      "current_design_peak_W": 18,
      "verification_id": "VER-PWR-07"
    },
    {
      "id": "ICD-EPS-PAY-02",
      "type": "interface",
      "status": "review required if proposal proceeds",
      "links": [
        "PAY-PWR-014",
        "VER-PWR-07"
      ],
      "review_scope": "Electrical power interface, load profile, supply and operating assumptions."
    },
    {
      "id": "VER-PWR-07",
      "type": "verification_plan",
      "status": "planned example only; no test execution or accepted evidence asserted",
      "requirement_revision": "B",
      "proposed_response": "Review test conditions and acceptance criteria if revision C is approved; do not reuse evidence without applicability review."
    },
    {
      "id": "PROP-PWR-01",
      "type": "proposal",
      "baseline": "BL-03",
      "proposed_requirement_revision": "C",
      "proposed_design_peak_W": 24,
      "status": "not approved",
      "finding": "Exceeds the present 20 W payload cap by 4 W; increases peak programme demand by 6 W.",
      "human_decision": "Assess alternatives and downstream impacts. Do not change the approved cap merely to make the proposal pass."
    }
  ],
  "budget": {
    "available_peak_power_W": 59,
    "other_peak_loads_W": 36,
    "before": {
      "payload_W": 18,
      "total_W": 54,
      "margin_W": 5
    },
    "proposal": {
      "payload_W": 24,
      "total_W": 60,
      "margin_W": -1
    },
    "calculation": "margin = available_peak_power - other_peak_loads - payload_peak_power"
  },
  "agent_output_contract": {
    "inputs": [
      "Baseline and revision identifiers",
      "Applicable records and explicit relationships",
      "Assumptions and permissions"
    ],
    "outputs": [
      "Cited findings",
      "Calculated difference with units",
      "Missing information",
      "Proposed review actions"
    ],
    "authority": "The agent can analyse and propose; an authorised human decides controlled changes.",
    "stop_conditions": [
      "Conflicting baselines",
      "Missing applicable records",
      "Unresolved units or operating conditions",
      "A requested action outside permissions"
    ]
  }
}