{
  "open_checklist_version": "1.0",
  "id": "socata-tb20-emergency",
  "title": "SOCATA TB 20 Trinidad — Emergency Procedures",
  "description": "Emergency procedures for the SOCATA TB 20 Trinidad with Lycoming IO-540 fuel-injected engine, constant-speed propeller, and retractable tricycle gear. Memory items are marked. The IO-540 is fuel-injected — carburetor ice does not apply to the induction system, but intake icing is noted where relevant. The TB 20 has a manual emergency gear extension system; locate and review the override mechanism before flight. All airspeeds and numerical limits must come from the specific aircraft POH. These procedures are a general guide only — not a substitute for recurrent emergency training or a qualified type checkout.",
  "aircraft": {
    "make": "SOCATA",
    "model": "TB 20",
    "variant": "Trinidad",
    "icao_type": "TB20",
    "category": "standard_normal",
    "engine": [
      {
        "make": "Lycoming",
        "model": "IO-540",
        "type": "piston_4stroke",
        "count": 1
      }
    ],
    "propeller": "constant_speed",
    "gear": "retractable"
  },
  "units": {
    "airspeed": "kt",
    "altitude": "ft",
    "fuel": "usgal",
    "weight": "lb",
    "pressure": "inhg",
    "temperature": "f"
  },
  "provenance": {
    "source": {
      "kind": "none",
      "notes": "No manufacturer document consulted. Written from general familiarity with the type."
    },
    "transcription": {
      "method": "authored",
      "tool": "claude-sonnet-4-6",
      "date": "2026-08-11"
    },
    "contributors": [
      {
        "name": "Open Checklists project",
        "role": [
          "author"
        ]
      }
    ],
    "revision": {
      "file_revision": "0.1.0",
      "updated": "2026-08-11"
    }
  },
  "verification": {
    "source_fidelity": "not_applicable",
    "operational_review": "none",
    "completeness": "partial",
    "known_issues": [
      {
        "severity": "safety_defect",
        "description": "Contains no airspeeds, power settings, fuel quantities, or other numerical limitations — all must come from the specific aircraft POH.",
        "location": "whole file"
      },
      {
        "severity": "content_gap",
        "description": "Equipment variations exist across this model/variant. Verify items against the specific aircraft before use.",
        "location": "whole file"
      }
    ]
  },
  "rights": {
    "status": "original_expression",
    "corpus_license": "CC-BY-4.0",
    "redistribution": "attribution_required",
    "notes": "Manufacturer POH remains under copyright. This file does not reproduce its wording or selection of items."
  },
  "sections": [
    {
      "id": "engine-fail-on-takeoff",
      "phase": "engine_failure_before_rotation",
      "title": "Engine Failure on Takeoff — Before or At Liftoff",
      "criticality": "emergency",
      "items": [
        {
          "type": "action",
          "id": "efot-1",
          "text": "Throttle",
          "response": "CLOSE IMMEDIATELY",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "efot-2",
          "text": "Brakes — apply firmly to stop within remaining runway length",
          "response": "APPLIED FIRMLY",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "efot-3",
          "text": "Mixture",
          "response": "IDLE CUTOFF",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "efot-4",
          "text": "Ignition switch",
          "response": "OFF",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "efot-5",
          "text": "Master switch",
          "response": "OFF",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "efot-6",
          "text": "Fuel selector",
          "response": "OFF",
          "tickable": true
        },
        {
          "type": "caution",
          "id": "efot-c1",
          "text": "Do not attempt a turn back to the runway at low altitude. If airborne with insufficient runway remaining, land ahead or on the best available surface within a narrow arc of the departure heading.",
          "tickable": false
        },
        {
          "type": "action",
          "id": "efot-7",
          "text": "Occupants — advise to brace for impact",
          "response": "BRACE POSITION",
          "tickable": true
        }
      ]
    },
    {
      "id": "engine-fail-in-flight",
      "phase": "engine_failure_in_flight",
      "title": "Engine Failure in Flight",
      "criticality": "emergency",
      "items": [
        {
          "type": "action",
          "id": "efif-1",
          "text": "Airspeed — pitch for best glide without delay",
          "response": "BEST GLIDE SPEED PER POH",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "efif-2",
          "text": "Landing area — identify best available field or surface within glide range",
          "response": "SELECTED; COMMIT TO IT",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "efif-3",
          "text": "Fuel selector — switch to opposite tank",
          "response": "OPPOSITE TANK SELECTED",
          "tickable": true
        },
        {
          "type": "action",
          "id": "efif-4",
          "text": "Mixture",
          "response": "RICH",
          "tickable": true
        },
        {
          "type": "action",
          "id": "efif-5",
          "text": "Ignition switch",
          "response": "BOTH — confirm ON",
          "tickable": true
        },
        {
          "type": "action",
          "id": "efif-6",
          "text": "Electric fuel pump",
          "response": "ON",
          "tickable": true
        },
        {
          "type": "action",
          "id": "efif-7",
          "text": "Throttle — advance if restart is being attempted",
          "response": "AS REQUIRED FOR RESTART ATTEMPT",
          "tickable": true
        },
        {
          "type": "action",
          "id": "efif-8",
          "text": "If restart fails — secure engine and follow Forced Landing checklist",
          "response": "PROCEED TO FORCED LANDING",
          "tickable": true
        }
      ]
    },
    {
      "id": "engine-fire-in-flight",
      "phase": "engine_fire_in_flight",
      "title": "Engine Fire in Flight",
      "criticality": "emergency",
      "items": [
        {
          "type": "action",
          "id": "efif-fire-1",
          "text": "Mixture",
          "response": "IDLE CUTOFF — starve fire of fuel",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "efif-fire-2",
          "text": "Fuel selector",
          "response": "OFF",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "efif-fire-3",
          "text": "Throttle",
          "response": "FULL OPEN — clear residual fuel from induction system",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "efif-fire-4",
          "text": "Electric fuel pump",
          "response": "OFF",
          "tickable": true
        },
        {
          "type": "action",
          "id": "efif-fire-5",
          "text": "Master switch",
          "response": "OFF — remove electrical ignition source",
          "tickable": true
        },
        {
          "type": "action",
          "id": "efif-fire-6",
          "text": "Airspeed — increase if fire persists to attempt to blow out flames; do not exceed Vne",
          "response": "INCREASE AS PRACTICABLE PER POH",
          "tickable": true
        },
        {
          "type": "action",
          "id": "efif-fire-7",
          "text": "If fire extinguishes — execute immediate precautionary landing; do not attempt restart",
          "response": "PRECAUTIONARY LANDING; NO RESTART",
          "tickable": true
        },
        {
          "type": "action",
          "id": "efif-fire-8",
          "text": "If fire continues — execute forced landing with urgency; follow Forced Landing checklist",
          "response": "FORCED LANDING — EXPEDITE",
          "tickable": true
        }
      ]
    },
    {
      "id": "engine-fire-on-ground",
      "phase": "engine_fire_ground",
      "title": "Engine Fire on Ground",
      "criticality": "emergency",
      "items": [
        {
          "type": "action",
          "id": "efog-1",
          "text": "Mixture",
          "response": "IDLE CUTOFF",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "efog-2",
          "text": "Ignition switch",
          "response": "OFF",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "efog-3",
          "text": "Fuel selector",
          "response": "OFF",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "efog-4",
          "text": "Master switch",
          "response": "OFF",
          "tickable": true
        },
        {
          "type": "action",
          "id": "efog-5",
          "text": "Occupants — evacuate immediately via car-style doors; move upwind of the aircraft",
          "response": "ALL OCCUPANTS CLEAR; UPWIND",
          "tickable": true
        },
        {
          "type": "action",
          "id": "efog-6",
          "text": "Fire extinguisher — direct at base of fire through cowl openings if accessible without risk",
          "response": "APPLIED IF SAFE",
          "tickable": true
        },
        {
          "type": "action",
          "id": "efog-7",
          "text": "Emergency services — call 911 / ATC / airport fire",
          "response": "NOTIFIED",
          "tickable": true
        }
      ]
    },
    {
      "id": "electrical-fire",
      "phase": "electrical_fire",
      "title": "Electrical Fire / Smoke in Cockpit",
      "criticality": "emergency",
      "items": [
        {
          "type": "action",
          "id": "elec-fire-1",
          "text": "Master switch",
          "response": "OFF — isolate all electrical power",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "elec-fire-2",
          "text": "Avionics master switch",
          "response": "OFF",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "elec-fire-3",
          "text": "Vents and fresh air — open to ventilate cabin; do not fan smouldering materials",
          "response": "VENTILATED",
          "tickable": true
        },
        {
          "type": "action",
          "id": "elec-fire-4",
          "text": "If smoke and fire subside — identify and isolate the faulty circuit before restoring power",
          "response": "FAULTY CIRCUIT IDENTIFIED AND ISOLATED",
          "tickable": true
        },
        {
          "type": "action",
          "id": "elec-fire-5",
          "text": "Essential avionics — restore selectively and one at a time; monitor for recurrence",
          "response": "RESTORED AS NEEDED FOR SAFE FLIGHT",
          "tickable": true
        },
        {
          "type": "action",
          "id": "elec-fire-6",
          "text": "Land as soon as practicable",
          "response": "DIVERT TO NEAREST SUITABLE AIRPORT",
          "tickable": true
        }
      ]
    },
    {
      "id": "loss-of-oil-pressure",
      "phase": "oil_system_malfunction",
      "title": "Loss of Oil Pressure",
      "criticality": "emergency",
      "items": [
        {
          "type": "action",
          "id": "oil-1",
          "text": "Oil pressure gauge — confirm reading and crosscheck oil temperature for trend",
          "response": "CONFIRMED LOW; OIL TEMP NOTED",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "oil-2",
          "text": "Power — reduce to minimum required to maintain safe flight",
          "response": "POWER REDUCED",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "oil-3",
          "text": "Land as soon as possible — do not operate with low or zero oil pressure; total engine failure may follow",
          "response": "DIVERT IMMEDIATELY TO NEAREST AIRPORT",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "oil-4",
          "text": "Suitable landing area — identify in case of sudden engine seizure",
          "response": "LANDING AREA IN SIGHT",
          "tickable": true
        },
        {
          "type": "action",
          "id": "oil-5",
          "text": "ATC — declare emergency and advise intentions",
          "response": "ATC NOTIFIED; INTENTIONS STATED",
          "tickable": true
        },
        {
          "type": "action",
          "id": "oil-6",
          "text": "If engine seizes — follow Engine Failure in Flight checklist",
          "response": "FORCED LANDING PROCEDURES",
          "tickable": true
        }
      ]
    },
    {
      "id": "induction-icing",
      "phase": "icing",
      "title": "Induction System Icing (Alternate Air)",
      "criticality": "emergency",
      "items": [
        {
          "type": "caution",
          "id": "induct-c1",
          "text": "The IO-540 is fuel-injected — carburetor ice does not occur. However, impact icing of the primary air inlet is possible in visible moisture. The TB 20 is equipped with an alternate air source; activation bypasses the primary induction inlet.",
          "tickable": false
        },
        {
          "type": "action",
          "id": "induct-1",
          "text": "Symptoms — rough running, loss of power, or unusual RPM/MAP fluctuation in IMC or visible moisture",
          "response": "NOTED",
          "tickable": true
        },
        {
          "type": "action",
          "id": "induct-2",
          "text": "Alternate air control — select ALTERNATE AIR (or ALT AIR OPEN per aircraft labelling)",
          "response": "ALTERNATE AIR SELECTED",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "induct-3",
          "text": "Engine performance — monitor for recovery; expect slight power reduction on alternate air",
          "response": "POWER RESTORED OR STABILISED",
          "tickable": true
        },
        {
          "type": "action",
          "id": "induct-4",
          "text": "Altitude and routing — avoid continued flight in icing conditions if practical",
          "response": "ALTITUDE OR ROUTE ADJUSTED",
          "tickable": true
        },
        {
          "type": "action",
          "id": "induct-5",
          "text": "If power does not recover — treat as engine emergency and prepare for precautionary landing",
          "response": "PRECAUTIONARY LANDING INITIATED",
          "tickable": true
        }
      ]
    },
    {
      "id": "forced-landing",
      "phase": "forced_landing",
      "title": "Forced Landing (Power-Off)",
      "criticality": "emergency",
      "items": [
        {
          "type": "action",
          "id": "forced-1",
          "text": "Airspeed — establish and maintain best glide",
          "response": "BEST GLIDE SPEED PER POH",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "forced-2",
          "text": "Landing area — select the best available surface; commit and do not change plan at low altitude",
          "response": "FIELD SELECTED",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "forced-3",
          "text": "Transponder",
          "response": "7700 — squawk emergency",
          "tickable": true
        },
        {
          "type": "action",
          "id": "forced-4",
          "text": "ATC — declare MAYDAY; state position, altitude, and intentions",
          "response": "MAYDAY DECLARED; POSITION GIVEN",
          "tickable": true
        },
        {
          "type": "action",
          "id": "forced-5",
          "text": "Fuel selector",
          "response": "OFF",
          "tickable": true
        },
        {
          "type": "action",
          "id": "forced-6",
          "text": "Mixture",
          "response": "IDLE CUTOFF",
          "tickable": true
        },
        {
          "type": "action",
          "id": "forced-7",
          "text": "Ignition switch",
          "response": "OFF",
          "tickable": true
        },
        {
          "type": "action",
          "id": "forced-8",
          "text": "Master switch — leave on until final approach to retain flap and gear operation, then OFF",
          "response": "OFF BEFORE TOUCHDOWN",
          "tickable": true
        },
        {
          "type": "action",
          "id": "forced-9",
          "text": "Flaps — extend on final approach per POH to reduce touchdown speed",
          "response": "EXTENDED AS REQUIRED",
          "tickable": true
        },
        {
          "type": "action",
          "id": "forced-10",
          "text": "Landing gear — extend if landing on a prepared surface; leave retracted for off-field terrain landing per judgement",
          "response": "DOWN FOR PAVED/FIRM SURFACE; CONSIDER RETRACTED FOR ROUGH TERRAIN",
          "tickable": true
        },
        {
          "type": "action",
          "id": "forced-11",
          "text": "Seat belts and shoulder harnesses — all occupants confirm tight",
          "response": "TIGHT",
          "tickable": true
        },
        {
          "type": "action",
          "id": "forced-12",
          "text": "Doors — unlatch before touchdown to prevent jamming",
          "response": "UNLATCHED",
          "tickable": true
        }
      ]
    },
    {
      "id": "gear-unsafe",
      "phase": "landing_gear_malfunction",
      "title": "Gear Unsafe / Gear Will Not Indicate Down",
      "criticality": "emergency",
      "items": [
        {
          "type": "action",
          "id": "gear-unsafe-1",
          "text": "Gear handle — confirm in DOWN position",
          "response": "DOWN CONFIRMED",
          "tickable": true
        },
        {
          "type": "action",
          "id": "gear-unsafe-2",
          "text": "Airspeed — confirm within gear operating speed range",
          "response": "WITHIN Vlo PER POH",
          "tickable": true
        },
        {
          "type": "action",
          "id": "gear-unsafe-3",
          "text": "Circuit breakers — check gear-related breakers for tripped condition",
          "response": "BREAKERS CHECKED; RESET IF TRIPPED ONCE",
          "tickable": true
        },
        {
          "type": "action",
          "id": "gear-unsafe-4",
          "text": "Gear handle — recycle: raise then lower again",
          "response": "RECYCLED; INDICATORS CHECKED",
          "tickable": true
        },
        {
          "type": "action",
          "id": "gear-unsafe-5",
          "text": "If still unsafe — fly-by or request tower visual inspection if available",
          "response": "VISUAL CONFIRMATION SOUGHT",
          "tickable": true
        },
        {
          "type": "action",
          "id": "gear-unsafe-6",
          "text": "If gear will not extend normally — proceed to Emergency Gear Extension checklist",
          "response": "EMERGENCY EXTENSION INITIATED",
          "tickable": true
        }
      ]
    },
    {
      "id": "emergency-gear-extension",
      "phase": "landing_gear_malfunction",
      "title": "Emergency Gear Extension",
      "criticality": "emergency",
      "items": [
        {
          "type": "caution",
          "id": "ege-c1",
          "text": "Locate and review the manual gear extension mechanism in the specific aircraft before flight. Mechanism location and procedure vary by aircraft serial and modification status — always verify against the aircraft POH.",
          "tickable": false
        },
        {
          "type": "action",
          "id": "ege-1",
          "text": "Airspeed — reduce to below maximum gear extension speed and maintain",
          "response": "AT OR BELOW Vlo PER POH",
          "tickable": true,
          "memory_item": true
        },
        {
          "type": "action",
          "id": "ege-2",
          "text": "Landing gear handle",
          "response": "DOWN",
          "tickable": true
        },
        {
          "type": "action",
          "id": "ege-3",
          "text": "Gear circuit breaker — check and reset if tripped",
          "response": "CHECKED; RESET IF APPROPRIATE",
          "tickable": true
        },
        {
          "type": "action",
          "id": "ege-4",
          "text": "Emergency gear extension — engage manual override per aircraft POH procedure",
          "response": "OVERRIDE ENGAGED PER POH",
          "tickable": true
        },
        {
          "type": "action",
          "id": "ege-5",
          "text": "Gear position indicators — verify three green after manual extension",
          "response": "THREE GREEN CONFIRMED — OR NOTE ANY UNSAFE INDICATION",
          "tickable": true
        },
        {
          "type": "action",
          "id": "ege-6",
          "text": "If any gear does not show green — do not retract; plan for minimum runway landing; notify ATC",
          "response": "ATC ADVISED; EMERGENCY DECLARED IF NOT ALREADY",
          "tickable": true
        },
        {
          "type": "action",
          "id": "ege-7",
          "text": "After landing — do not taxi; shutdown on runway and await maintenance inspection before any further movement",
          "response": "AIRCRAFT STOPPED ON RUNWAY; MAINTENANCE NOTIFIED",
          "tickable": true
        }
      ]
    }
  ]
}