{
  "ftaDoc": {
    "version": "5.0",
    "standard": "IEC61025",
    "savedAt": "2026-03-10T03:38:07.486374Z"
  },
  "projects": [
    {
      "id": "p49af6ef0",
      "name": "Automotive \u2014 Brake System",
      "expanded": true,
      "settings": {
        "description": "Fault tree analysis for vehicle failing to stop within required distance due to brake system failure. Covers service brake hydraulic failure, ABS/ESC failure and secondary braking loss. Developed per ISO 26262-5 ASIL-D and ECE Regulation 13.",
        "organization": "FTA Studio Template Library",
        "analyst": "",
        "revision": "A",
        "standard": "IEC61025",
        "silTarget": "SIL3",
        "missionTime": 8760,
        "anaMethod": "exact",
        "sciNotation": true
      },
      "ftas": [
        {
          "id": "f657ac81f",
          "name": "Vehicle Fails to Stop \u2014 Brake Failure",
          "nodes": [
            {
              "id": "na445c11e",
              "uid": "TOP-001",
              "ntype": "top",
              "gateType": "AND",
              "name": "Vehicle Fails to Stop Within Required Distance",
              "desc": "Vehicle cannot achieve required deceleration for emergency stop due to brake system failure. Ref: ISO 26262-5, ECE R13. ASIL-D function.",
              "outputId": null,
              "refId": null,
              "prob": null,
              "lambda": null,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "",
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              "x": 640.0,
              "y": 80
            },
            {
              "id": "n8b6fe47f",
              "uid": "G-001",
              "ntype": "gate",
              "gateType": "OR",
              "name": "Service Brake System Failure",
              "desc": "Primary hydraulic service brake system unable to apply required force.",
              "outputId": "na445c11e",
              "refId": null,
              "prob": null,
              "lambda": null,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "",
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              "evidence": "",
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              "x": 140.0,
              "y": 250
            },
            {
              "id": "nf13045f1",
              "uid": "G-002",
              "ntype": "gate",
              "gateType": "OR",
              "name": "Hydraulic Circuit Failure",
              "desc": "Loss of hydraulic fluid pressure in braking circuit.",
              "outputId": "n8b6fe47f",
              "refId": null,
              "prob": null,
              "lambda": null,
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              "missionTime": 8760,
              "sil": null,
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              "occurrence": null,
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              "x": -60.0,
              "y": 420
            },
            {
              "id": "na4cac4ba",
              "uid": "BE-001",
              "ntype": "basic",
              "gateType": null,
              "name": "Brake master cylinder internal failure",
              "desc": "Master cylinder cup seal bypass or bore damage \u2014 no pressure generation.",
              "outputId": "nf13045f1",
              "refId": null,
              "prob": null,
              "lambda": 3e-07,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "No pressure generation",
              "detection": "Brake feel / pedal travel change; pressure sensor",
              "hazards": [],
              "evidence": "",
              "mitigation": "Tandem master cylinder (dual circuit)",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": -220.0,
              "y": 590
            },
            {
              "id": "n9146f636",
              "uid": "BE-002",
              "ntype": "basic",
              "gateType": null,
              "name": "Hydraulic brake line fracture",
              "desc": "Steel or flexible brake line fracture from corrosion, fatigue or impact.",
              "outputId": "nf13045f1",
              "refId": null,
              "prob": null,
              "lambda": 5e-08,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "Loss of hydraulic pressure to wheel",
              "detection": "Brake fluid low level warning",
              "hazards": [],
              "evidence": "",
              "mitigation": "Split dual-circuit: front/rear or X-split layout",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": -60.0,
              "y": 590
            },
            {
              "id": "na62f4d34",
              "uid": "BE-003",
              "ntype": "basic",
              "gateType": null,
              "name": "Brake fluid loss / vapour lock",
              "desc": "Brake fluid loss via leak or vapourisation under high-temperature braking.",
              "outputId": "nf13045f1",
              "refId": null,
              "prob": null,
              "lambda": 1e-07,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "Compressible fluid \u2014 no pressure",
              "detection": "Fluid level sensor; brake pedal feel change",
              "hazards": [],
              "evidence": "",
              "mitigation": "Sealed system; DOT 5.1 high-boiling-point fluid; regular fluid change",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 100.0,
              "y": 590
            },
            {
              "id": "nb0d595b5",
              "uid": "G-003",
              "ntype": "gate",
              "gateType": "OR",
              "name": "Wheel Brake Unit Failure",
              "desc": "Caliper or brake pad fails at wheel.",
              "outputId": "n8b6fe47f",
              "refId": null,
              "prob": null,
              "lambda": null,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "",
              "detection": "",
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              "evidence": "",
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              "occurrence": null,
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              "x": 340.0,
              "y": 420
            },
            {
              "id": "nb1e0a7f6",
              "uid": "BE-004",
              "ntype": "basic",
              "gateType": null,
              "name": "Brake pad excessive wear \u2014 metal-to-metal",
              "desc": "Brake pad worn beyond minimum thickness \u2014 warning system not acted on.",
              "outputId": "nb0d595b5",
              "refId": null,
              "prob": null,
              "lambda": 5e-07,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "Severely reduced friction coefficient",
              "detection": "Pad wear sensor warning",
              "hazards": [],
              "evidence": "",
              "mitigation": "Wear sensor; scheduled maintenance interval",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 260.0,
              "y": 590
            },
            {
              "id": "nf3bb0f4b",
              "uid": "BE-005",
              "ntype": "basic",
              "gateType": null,
              "name": "Brake caliper piston seizure",
              "desc": "Caliper piston corrosion or debris causing seized piston.",
              "outputId": "nb0d595b5",
              "refId": null,
              "prob": null,
              "lambda": 2e-07,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "Brake does not apply / dragging brake",
              "detection": "Wheel temperature monitoring; vehicle pull detection",
              "hazards": [],
              "evidence": "",
              "mitigation": "Stainless piston; corrosion protection; periodic maintenance",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 420.0,
              "y": 590
            },
            {
              "id": "n2778b093",
              "uid": "G-004",
              "ntype": "gate",
              "gateType": "AND",
              "name": "ABS / ESC Intervention Failure",
              "desc": "ABS and ESC cannot optimise braking on low-friction surface.",
              "outputId": "na445c11e",
              "refId": null,
              "prob": null,
              "lambda": null,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "",
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              "evidence": "",
              "mitigation": "",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 780.0,
              "y": 250
            },
            {
              "id": "n23e86245",
              "uid": "G-005",
              "ntype": "gate",
              "gateType": "OR",
              "name": "ABS Control System Failure",
              "desc": "ABS ECU or sensor fails preventing wheel lock detection.",
              "outputId": "n2778b093",
              "refId": null,
              "prob": null,
              "lambda": null,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "",
              "detection": "",
              "hazards": [],
              "evidence": "",
              "mitigation": "",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 660.0,
              "y": 420
            },
            {
              "id": "naba86577",
              "uid": "BE-006",
              "ntype": "basic",
              "gateType": null,
              "name": "Wheel speed sensor signal fault",
              "desc": "Wheel speed sensor failure \u2014 damaged cable, contaminated tone ring.",
              "outputId": "n23e86245",
              "refId": null,
              "prob": null,
              "lambda": 3e-07,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "Incorrect wheel speed \u2014 wrong modulation",
              "detection": "Signal plausibility check; ABS warning lamp",
              "hazards": [],
              "evidence": "",
              "mitigation": "Active magnetic sensor; redundant speed sensing",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 580.0,
              "y": 590
            },
            {
              "id": "n9a81ddf1",
              "uid": "BE-007",
              "ntype": "basic",
              "gateType": null,
              "name": "ABS ECU hardware fault",
              "desc": "ABS ECU hardware fault disabling modulation \u2014 processor or I/O failure.",
              "outputId": "n23e86245",
              "refId": null,
              "prob": null,
              "lambda": 1e-07,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "No ABS intervention",
              "detection": "Power-on self-test; ABS warning lamp",
              "hazards": [],
              "evidence": "",
              "mitigation": "ASIL-D ECU design with lockstep cores",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 740.0,
              "y": 590
            },
            {
              "id": "n52cde8c8",
              "uid": "BE-008",
              "ntype": "basic",
              "gateType": null,
              "name": "Hydraulic modulator valve fault",
              "desc": "ABS hydraulic modulator solenoid valve fails to cycle \u2014 stiction or electrical fault.",
              "outputId": "n2778b093",
              "refId": null,
              "prob": null,
              "lambda": 2e-07,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "Valve stuck \u2014 no pressure modulation",
              "detection": "Modulator performance test; ABS lamp",
              "hazards": [],
              "evidence": "",
              "mitigation": "Redundant inlet/outlet valves per circuit",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 900.0,
              "y": 420
            },
            {
              "id": "n543e6700",
              "uid": "G-006",
              "ntype": "gate",
              "gateType": "OR",
              "name": "Redundant Braking System Failure",
              "desc": "Secondary braking means also unavailable.",
              "outputId": "na445c11e",
              "refId": null,
              "prob": null,
              "lambda": null,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "",
              "detection": "",
              "hazards": [],
              "evidence": "",
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              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 1140.0,
              "y": 250
            },
            {
              "id": "nbcf6fc0b",
              "uid": "BE-009",
              "ntype": "basic",
              "gateType": null,
              "name": "Secondary hydraulic brake circuit failure",
              "desc": "Failure of the independent secondary hydraulic circuit (common-cause excluded by X-split layout).",
              "outputId": "n543e6700",
              "refId": null,
              "prob": null,
              "lambda": 2e-08,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "Dual-circuit provides no redundancy",
              "detection": "Brake warning lamp (single circuit failure)",
              "hazards": [],
              "evidence": "",
              "mitigation": "Dual-circuit mandated by ECE R13",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 1060.0,
              "y": 420
            },
            {
              "id": "n4febc731",
              "uid": "BE-010",
              "ntype": "basic",
              "gateType": null,
              "name": "Electronic parking brake (EPB) failure",
              "desc": "Electric parking brake actuator or controller fault.",
              "outputId": "n543e6700",
              "refId": null,
              "prob": null,
              "lambda": 1e-07,
              "mu": null,
              "missionTime": 8760,
              "sil": null,
              "failureMode": "EPB cannot hold or slow vehicle",
              "detection": "EPB self-test; warning lamp",
              "hazards": [],
              "evidence": "",
              "mitigation": "EPB auto-hold function provides independent brake path",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 1220.0,
              "y": 420
            }
          ],
          "cam": {
            "x": 360,
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            "zoom": 0.72
          },
          "analysis": null,
          "ccfGroups": [],
          "disjointGroups": [],
          "diagramPages": [],
          "seqId": 1
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      ],
      "eventLibrary": []
    }
  ],
  "_id": 200,
  "_uid": {},
  "ccfGroups": []
}