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Trailing edge flaps

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NTSB finding · Aircraft › Aircraft structures › Wing structure

All 33 cases28 in the probable cause
Cases
33
In the probable cause
28 (85%)
Fatal cases
8
NTSB code
01035753

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\", '01035753') 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\", '01035753'))
  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\", '01035753') 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 · 33

NTSB CEN23LA335Accident · No injuriesClass 4 · LimitedFinal reportPiper PA-25-235 · Tyler, MNThe pilot’s improper flap position during takeoff, which resulted in degraded climb performance and a collision with terrain.Jul 28, 2023 · N7094Z · Substantial damageNTSB ERA23LA271Accident · Minor injuriesClass 4 · LimitedFinal reportCessna 172 · Seymore, TNThe flight instructor’s failure to properly configure the wing flaps for a soft-field takeoff on a short runway, which resulted in a runway overrun and collision with trees.Jun 18, 2023 · N12395 · Substantial damageNTSB ERA22LA116Accident · No injuriesClass 4 · LimitedFinal reportDehavilland DHC-2 · Gilbert, SCThe pilot’s improper flap setting, which resulted in a collision with trees during a takeoff attempt from a short grass field.Feb 5, 2022 · N1454Z · Substantial damageNTSB CEN21FA199Accident · 1 fatalClass 3 · FieldFinal reportCirrus Design SR22 · Port Aransas, TXThe pilot’s failure to maintain adequate airspeed during the go-around, which resulted in the airplane exceeding its critical angle of attack and a subsequent aerodynamic stall.Apr 24, 2021 · N587CD · DestroyedNTSB GAA19CA029Accident · No injuriesData collectionFinal reportCapital Holdings 226 CCX-2000 · Dahlonga, GAThe pilot's improper landing flare, which resulted in a bounced landing and his subsequent failure to maintain directional control. Also causal to the accident was the pilot’s failure to retract the flaps during the aborted landing, which resulted in the…Oct 18, 2018 · N468LM · Substantial damageNTSB GAA18CA575Accident · Serious injuriesData collectionFinal reportPiper PA28 · Spokane, WAThe pilot’s improper retraction of the flaps during a go-around, which resulted in the airplane’s failure to climb and its subsequent collision with trees.Sep 29, 2018 · N40825 · Substantial damageNTSB GAA18CA287Accident · No injuriesData collectionFinal reportMaule M 7 · Burnet, TXThe pilot’s failure to maintain directional control during landing in gusting wind conditions and with an incorrect flap configuration.May 19, 2018 · N427LS · Substantial damageNTSB ERA17LA141Accident · No injuriesLimited investigationFinal reportCessna R182 · Mooresville, NCThe pilot's failure to properly configure the airplane's flaps for takeoff, which resulted in a longer ground roll and subsequent runway excursion.Mar 29, 2017 · N2383C · Substantial damageNTSB ERA16LA322Accident · No injuriesLimited investigationFinal reportAero Vodochody L 39 · Norfolk, VAAn uncommanded flap retraction for reasons that could not be determined, as a postaccident examination of the flap system did not reveal evidence of any preaccident anomalies.Sep 23, 2016 · N139AJ · Substantial damageNTSB CEN16LA342Accident · No injuriesLimited investigationFinal reportFairchild M 62A-3 · Madison, OHThe pilot's failure to follow the Before Takeoff checklist and his improper use of flaps during takeoff, which degraded the airplane's climb performance and resulted in a collision with trees.Aug 30, 2016 · N47164 · Substantial damage
See all 33 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\", '01035753'))
  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.