{
  "ftaDoc": {
    "version": "5.0",
    "standard": "IEC61025",
    "savedAt": "2026-03-10T03:38:07.485101Z"
  },
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    {
      "id": "pc0726d96",
      "name": "Aviation \u2014 Hydraulic Systems",
      "expanded": true,
      "settings": {
        "description": "Fault tree analysis for total loss of aircraft hydraulic power affecting all three independent systems. Prepared in accordance with ARP4761 for DAL-A/Catastrophic classification. Target: <1E-9 per flight hour.",
        "organization": "FTA Studio Template Library",
        "analyst": "",
        "revision": "A",
        "standard": "IEC61025",
        "silTarget": "",
        "missionTime": 25000,
        "anaMethod": "exact",
        "sciNotation": true
      },
      "ftas": [
        {
          "id": "f102c224d",
          "name": "Total Loss of Hydraulic Power",
          "nodes": [
            {
              "id": "n0cd93421",
              "uid": "TOP-001",
              "ntype": "top",
              "gateType": "AND",
              "name": "Total Loss of Aircraft Hydraulic Power",
              "desc": "Catastrophic failure of all hydraulic systems rendering flight controls, landing gear and brakes inoperative. Ref: ARP4761 DAL-A. Probability target: <1\u00d710\u207b\u2079/flight hour.",
              "outputId": null,
              "refId": null,
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              "x": 560.0,
              "y": 80
            },
            {
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              "uid": "G-001",
              "ntype": "gate",
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              "name": "System A Hydraulic Failure",
              "desc": "Complete loss of System A (typically powers primary flight controls, inboard spoilers).",
              "outputId": "n0cd93421",
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              "x": 140.0,
              "y": 250
            },
            {
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              "uid": "BE-001",
              "ntype": "basic",
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              "name": "System A engine-driven pump failure",
              "desc": "Engine-driven hydraulic pump on System A \u2014 bearing, gear or seal failure.",
              "outputId": "nd46e1842",
              "refId": null,
              "prob": null,
              "lambda": 5e-06,
              "mu": null,
              "missionTime": 25000,
              "sil": null,
              "failureMode": "No fluid delivery",
              "detection": "Low pressure warning, flow monitoring",
              "hazards": [],
              "evidence": "",
              "mitigation": "Electric backup pump auto-starts on pressure loss",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": -60.0,
              "y": 420
            },
            {
              "id": "n527efde6",
              "uid": "BE-002",
              "ntype": "basic",
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              "name": "System A hydraulic line rupture",
              "desc": "Rupture of primary System A hydraulic tubing \u2014 fatigue or impact.",
              "outputId": "nd46e1842",
              "refId": null,
              "prob": null,
              "lambda": 2e-06,
              "mu": null,
              "missionTime": 25000,
              "sil": null,
              "failureMode": "Uncontrolled fluid loss",
              "detection": "Low fluid level warning, pressure decay",
              "hazards": [],
              "evidence": "",
              "mitigation": "Hydraulic fuses on critical branch circuits",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 100.0,
              "y": 420
            },
            {
              "id": "n23aab7c0",
              "uid": "G-002",
              "ntype": "gate",
              "gateType": "OR",
              "name": "System A Fluid Loss",
              "desc": "Progressive fluid loss through sealing or fitting failure.",
              "outputId": "nd46e1842",
              "refId": null,
              "prob": null,
              "lambda": null,
              "mu": null,
              "missionTime": 25000,
              "sil": null,
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              "x": 340.0,
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            {
              "id": "n2b5a163c",
              "uid": "BE-003",
              "ntype": "basic",
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              "name": "Actuator seal degradation",
              "desc": "Flight control actuator dynamic seal failure from wear or thermal damage.",
              "outputId": "n23aab7c0",
              "refId": null,
              "prob": null,
              "lambda": 3e-06,
              "mu": null,
              "missionTime": 25000,
              "sil": null,
              "failureMode": "Fluid bypass, pressure decay",
              "detection": "Qty monitoring, preflight visual inspection",
              "hazards": [],
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              "mitigation": "Scheduled seal replacement per maintenance interval",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 260.0,
              "y": 590
            },
            {
              "id": "n294d43fd",
              "uid": "BE-004",
              "ntype": "basic",
              "gateType": null,
              "name": "Hydraulic fitting failure",
              "desc": "Tube fitting or union failure \u2014 overtorque, vibration or corrosion.",
              "outputId": "n23aab7c0",
              "refId": null,
              "prob": null,
              "lambda": 1.5e-06,
              "mu": null,
              "missionTime": 25000,
              "sil": null,
              "failureMode": "Leakage at connection point",
              "detection": "Visual inspection, fluid quantity monitoring",
              "hazards": [],
              "evidence": "",
              "mitigation": "Swaged fittings; flareless designs on critical circuits",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 420.0,
              "y": 590
            },
            {
              "id": "n3921adc1",
              "uid": "G-003",
              "ntype": "gate",
              "gateType": "OR",
              "name": "System B Hydraulic Failure",
              "desc": "Complete loss of System B (typically powers secondary flight controls, nose wheel steering).",
              "outputId": "n0cd93421",
              "refId": null,
              "prob": null,
              "lambda": null,
              "mu": null,
              "missionTime": 25000,
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              "severity": null,
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              "x": 660.0,
              "y": 250
            },
            {
              "id": "nfc6beb13",
              "uid": "BE-005",
              "ntype": "basic",
              "gateType": null,
              "name": "System B engine-driven pump failure",
              "desc": "System B engine-driven pump \u2014 identical design to System A pump.",
              "outputId": "n3921adc1",
              "refId": null,
              "prob": null,
              "lambda": 5e-06,
              "mu": null,
              "missionTime": 25000,
              "sil": null,
              "failureMode": "No fluid delivery",
              "detection": "Pressure monitoring, ECAM/EICAS warning",
              "hazards": [],
              "evidence": "",
              "mitigation": "Electric demand pump provides backup flow",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 580.0,
              "y": 420
            },
            {
              "id": "nf2e91d9a",
              "uid": "BE-006",
              "ntype": "basic",
              "gateType": null,
              "name": "System B hydraulic line rupture",
              "desc": "Rupture of System B tubing \u2014 routed separately from System A to prevent common-cause.",
              "outputId": "n3921adc1",
              "refId": null,
              "prob": null,
              "lambda": 2e-06,
              "mu": null,
              "missionTime": 25000,
              "sil": null,
              "failureMode": "Uncontrolled fluid loss",
              "detection": "Fluid quantity sensor",
              "hazards": [],
              "evidence": "",
              "mitigation": "Separate routing from System A (physical separation)",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 740.0,
              "y": 420
            },
            {
              "id": "n5ee69fb5",
              "uid": "G-004",
              "ntype": "gate",
              "gateType": "OR",
              "name": "Emergency Backup System Failure",
              "desc": "Loss of emergency hydraulic power sources (RAT and accumulator).",
              "outputId": "n0cd93421",
              "refId": null,
              "prob": null,
              "lambda": null,
              "mu": null,
              "missionTime": 25000,
              "sil": null,
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              "severity": null,
              "occurrence": null,
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              "x": 980.0,
              "y": 250
            },
            {
              "id": "n71333403",
              "uid": "BE-007",
              "ntype": "basic",
              "gateType": null,
              "name": "Ram Air Turbine (RAT) deployment failure",
              "desc": "RAT fails to deploy or generate hydraulic power \u2014 actuator or turbine fault.",
              "outputId": "n5ee69fb5",
              "refId": null,
              "prob": null,
              "lambda": 1e-06,
              "mu": null,
              "missionTime": 25000,
              "sil": null,
              "failureMode": "RAT does not extend or spin up",
              "detection": "RAT deployment test on ground; in-flight extension monitoring",
              "hazards": [],
              "evidence": "",
              "mitigation": "Electric backup motor on same RAT shaft",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 900.0,
              "y": 420
            },
            {
              "id": "n6e7ed4ba",
              "uid": "BE-008",
              "ntype": "basic",
              "gateType": null,
              "name": "Hydraulic accumulator pressure loss",
              "desc": "Pre-charged accumulator pressure loss \u2014 bladder or gas side failure.",
              "outputId": "n5ee69fb5",
              "refId": null,
              "prob": null,
              "lambda": 2e-06,
              "mu": null,
              "missionTime": 25000,
              "sil": null,
              "failureMode": "Insufficient stored energy for landing",
              "detection": "Preflight accumulator pressure check",
              "hazards": [],
              "evidence": "",
              "mitigation": "Auto-recharge from systems when available",
              "severity": null,
              "occurrence": null,
              "detectability": null,
              "x": 1060.0,
              "y": 420
            }
          ],
          "cam": {
            "x": 360,
            "y": 40,
            "zoom": 0.72
          },
          "analysis": null,
          "ccfGroups": [],
          "disjointGroups": [],
          "diagramPages": [],
          "seqId": 1
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      ],
      "eventLibrary": []
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  ],
  "_id": 200,
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  "ccfGroups": []
}