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Land gear sys wiring

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NTSB finding · Aircraft › Aircraft systems › Landing gear system

All 9 cases
Cases
9
In the probable cause
9 (100%)
Fatal cases
1
NTSB code
01023297

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\", '01023297') 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\", '01023297'))
  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\", '01023297') 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 · 9

NTSB WPR25LA122Accident · No injuriesClass 3 · LimitedFinal reportBeech C90A · Helena, MTThe failure of the left main landing gear to fully extend and lock as a result of broken downlock switch wires and the failure of the pilots to complete the manual gear extension checklist.Mar 16, 2025 · N513JM · Substantial damageNTSB ERA24LA376Accident · No injuriesClass 4 · LimitedFinal reportBeech 58 · Raleigh, NCDamage to the landing gear selector switch wire bundle which resulted in an inadvertent retraction of the landing gear during the takeoff roll.Sep 8, 2024 · N6037M · Substantial damageNTSB DCA24FA002Accident · No injuriesClass 2 · FieldFinal reportBoeing 757-236 · Chattanooga, TNThe failure of the alternate gear extension system, which prevented the landing gear from being lowered. The cause of the system failure was a broken wire, due to tensile overload, between the alternate gear extend switch and the alternate extension power…Oct 5, 2023 · N977FD · Substantial damageNTSB DCA20MA002Accident · 1 fatalClass 1 · MajorFinal reportSaab 2000 · Unalaska, AKThe landing gear manufacturer’s incorrect wiring of the wheel speed transducer harnesses on the left main landing gear during overhaul. The incorrect wiring caused the antiskid system not to function as intended, resulting in the failure of the left outboard…Oct 18, 2019 · N686PA · Substantial damageNTSB CEN17LA150Accident · No injuriesLimited investigationFinal reportPiper PA 28R-201 · Pontiac, MIMaintenance personnel’s improper securing of an unused instrument lamp socket during recent maintenance, which resulted in an electrical short of the landing gear controls and stopped the landing gear while it was transitioning to the down position and led to…Apr 9, 2017 · N36458 · Substantial damageNTSB CEN16LA374Accident · No injuriesLimited investigationFinal reportPiper PA-28R-201 · Bowling Green, OHThe pilots’ failure to complete the Emergency Landing Gear Extension checklist and maintenance personnel’s failure to correctly repair spliced wires on the left main landing gear down limit switch, which prevented the pilots from knowing whether the gear was…Sep 13, 2016 · N786BG · Substantial damageNTSB ERA10LA103Accident · No injuriesLimited investigationFinal reportFairchild SA227 · Somerset, KYDamaged wiring in the nosewheel steering harness, which resulted in a loss of control during landing. Contributing to the accident was the pilots' improper touchdown point.Jan 2, 2010 · N227ML · Substantial damageNTSB WPR09LA372Accident · No injuriesLimited investigationFinal reportPiper PA-30 · Walla Walla, WAA tripped landing gear motor circuit breaker, which prevented the gear from fully locking in the down position, and subsequent collapse during landing. Contributing to the accident was the disabled landing gear warning horn.Jul 22, 2009 · N7504Y · Substantial damageNTSB CEN09CA307Accident · No injuriesData collectionFinal reportBeech C35 · Englewood, COThe collapse of the landing gear due to the mechanic's failure to properly wire the landing gear squat switch.May 19, 2009 · N1945D · Substantial damage
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\", '01023297'))
  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.