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NTSB finding · Aircraft › Aircraft systems › Landing gear system

All 48 cases41 in the probable cause
Cases
48
In the probable cause
41 (85%)
Fatal cases
3
NTSB code
01023246

NTSB has coded findings and defining events since 2008. Earlier cases used its older occurrence and cause codes, so they aren’t counted here.

When and where

In green, cases where NTSB made it part of the probable cause; in gray, a factor or other finding. Findings are coded with the final report, often a year or more after the event, so the latest years are incomplete.

Cases per year

2008In the probable causeFactor only2026

Where

Open the map
Query with SQL
duckdb -csv -c "SELECT year(c.\"eventDate\") AS year, count(DISTINCT f.case_mkey) AS cases,
    count(DISTINCT f.case_mkey) FILTER (WHERE f.\"inProbableCause\") AS in_probable_cause
  FROM 'https://openairdocs.org/data/latest/ntsb_findings.parquet' f JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c.\"mKey\" = f.case_mkey
  WHERE starts_with(f.\"findingCode\", '01023246') AND c.\"eventDate\" >= DATE '2000-01-01'
  GROUP BY 1
  ORDER BY 1"

Prints the counts as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

In the same cases

Defining events
Aircraft models

Aircraft matched to the registry by N-number and date.

Other findings
Query with SQL
duckdb -csv -c "WITH matched AS (SELECT DISTINCT case_mkey, aircrafts_position FROM 'https://openairdocs.org/data/latest/ntsb_findings.parquet' WHERE starts_with(\"findingCode\", '01023246'))
  SELECT * FROM (
  SELECT 'Defining event' AS kind, e.\"tier2Number\" AS code, max(e.\"eventTier2Name\") AS name, count(DISTINCT f.case_mkey) AS cases
  FROM matched f JOIN 'https://openairdocs.org/data/latest/ntsb_events.parquet' e ON e.case_mkey = f.case_mkey AND e.aircrafts_position = f.aircrafts_position AND e.\"isDefiningEvent\"
  WHERE e.\"tier2Number\" <> ''
  GROUP BY ALL
  UNION ALL
  SELECT 'Aircraft model', a.aircraft_model_code, any_value(concat_ws(' ', m.manufacturer, m.model)), count(DISTINCT f.case_mkey)
  FROM matched f JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = f.case_mkey AND a.position = f.aircrafts_position
  LEFT JOIN 'https://openairdocs.org/data/latest/faa_aircraft_model.parquet' m ON m.code = a.aircraft_model_code
  WHERE a.aircraft_model_code IS NOT NULL
  GROUP BY ALL
  UNION ALL
  SELECT 'Other finding', left(g.\"findingCode\", 8), max(g.\"tier4Name\"), count(DISTINCT g.case_mkey)
  FROM 'https://openairdocs.org/data/latest/ntsb_findings.parquet' g
  WHERE g.case_mkey IN (SELECT case_mkey FROM matched) AND NOT starts_with(g.\"findingCode\", '01023246') AND g.\"findingCode\" GLOB '[0-9][0-9]*'
  GROUP BY ALL
  )
  QUALIFY row_number() OVER (PARTITION BY kind ORDER BY cases DESC) <= 10
  ORDER BY kind, cases DESC"

Prints the counts as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

Newest cases · 48

NTSB ERA25LA285Accident · No injuriesClass 4 · LimitedFinal reportCessna TU206 · Ellsworth, METhe pilot’s decision to operate the airplane with a known deficiency of the floats, which resulted in an accumulation of water in the forward compartments of the floats, a forward center of gravity, and subsequent nose over during a water landing.Aug 1, 2025 · N9493Z · Substantial damageNTSB DCA25LA275Accident · No injuriesClass 4 · LimitedFinal reportBoeing 737-8 · Denver, COThe failure of the airplane’s left main landing gear tires and wheels during the takeoff roll due to the thermal relief plugs melting and releasing tire pressure, which resulted in abnormal airplane handling characteristics and led the flight crew to reject…Jul 26, 2025 · N306SW · Substantial damageNTSB WPR24LA303Accident · No injuriesClass 4 · LimitedFinal reportCessna T206H · Big Bend-Gold Bar, WAThe pilot’s improper flare, which resulted in a hard landing.Aug 30, 2024 · N379ME · Substantial damageNTSB CEN24LA330Accident · No injuriesClass 4 · LimitedFinal reportEsqual VM1 · Oshkosh, WIThe pilot’s premature rotation during takeoff which resulted in the airplane settling back to the runway and the subsequent separation of the left wheel.Aug 27, 2024 · N151GH · Substantial damageNTSB ERA23LA179Accident · No injuriesClass 3 · LimitedFinal reportPiper PA-18AS-125 · Lakeland, FLThe pilot’s failure to ensure that the landing gear was properly configured for a water landing.Mar 22, 2023 · N1907A · Substantial damageNTSB ANC23FA001Accident · 1 fatalClass 3 · FieldFinal reportCessna A185F · Fairbanks, AKThe improperly maintained floats, which allowed water to fill the front compartments and resulted in the airplane nosing over during taxi. Contributing to the fatal injury of the pilot was the improperly secured cargo, which prevented the pilot from egressing…Oct 6, 2022 · N217C · No damageNTSB ANC22LA080Accident · 1 fatalClass 3 · LimitedFinal reportCessna 180A · Skwentna, AKThe failure of the landing gear float due to inadequate maintenance of the floats and corrosion.Sep 25, 2022 · N9728B · Substantial damageNTSB CEN22LA114Accident · No injuriesClass 4 · LimitedFinal reportAeronca 7AC · Cook, MNThe pilot’s failure to ensure the snow-covered takeoff area was safe, which resulted in a collision with ice and subsequent landing gear damage.Jan 29, 2022 · N2923E · Substantial damageNTSB ERA21LA246Accident · No injuriesClass 3 · LimitedFinal reportHonda HA-420 · Kennesaw, GAThe mechanic’s improper installation of the left main wheel assembly.Jun 4, 2021 · N10XN · Substantial damageNTSB ANC21LA022Accident · No injuriesClass 3 · LimitedFinal reportCessna A185F · Skwentna, AKInstallation of improper hardware on the ski check cable. Contributing to the accident was the inadequate inspection of the ski yokes, which resulted in the subsequent failure of the right main landing gear ski yoke and collapse of the right main landing gear…Mar 5, 2021 · N1848R · Substantial damage
See all 48 cases
Query with SQL
duckdb -csv -c "SELECT c.\"ntsbNumber\", c.\"eventDate\", c.\"eventType\", c.\"eventCity\", c.\"eventStateOrRegion\", a.n_number, a.\"aircraftMake\", a.\"aircraftModel\", c.\"highestInjuryLevel\", c.\"totalFatal\", c.\"completionStatus\", c.report_url
  FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c.\"mKey\" AND a.position = 1
  WHERE c.\"mKey\" IN (SELECT f.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_findings.parquet' f WHERE starts_with(f.\"findingCode\", '01023246'))
  ORDER BY c.\"eventDate\" DESC, c.\"ntsbNumber\" DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.