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Propeller feather/reversing

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NTSB finding · Aircraft › Aircraft propeller/rotor › Propeller system

All 26 cases23 in the probable cause
Cases
26
In the probable cause
23 (88%)
Fatal cases
13
NTSB code
01046123

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\", '01046123') 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\", '01046123'))
  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\", '01046123') 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 · 26

NTSB ERA24LA223Accident · No injuriesClass 3 · LimitedFinal reportBeechcraft TC-12B · Lehigh Acres, FLThe asymmetric reverse thrust during the landing roll for reasons that could not be determined, resulting in the flightcrew’s inability to maintain directional control and a subsequent runway excursion.May 20, 2024 · N762MC · Substantial damageNTSB ERA23FA274Accident · 3 fatalClass 3 · FieldFinal reportPiper PA-30 · Claxton, GAThe flight crew’s improper fuel management, which resulted in the airplane’s right engine being starved of fuel and its subsequent total loss of power.Jun 25, 2023 · N7240Y · Substantial damageNTSB ERA22LA237Accident · Minor injuriesClass 3 · LimitedFinal reportDiamond DA42 · Lehighton, PAThe flight instructor’s inadequate supervision of the flight and his failure to secure the right engine following an unsuccessful engine restart attempt, which resulted in the airplane’s inability to maintain altitude and a subsequent off-airport landing.May 9, 2022 · N988JA · Substantial damageNTSB WPR22LA114Accident · Serious injuriesClass 3 · LimitedFinal reportCessna 208B · Oceanside, CAThe pilot’s intentional inflight operation of the propeller in beta, which led to an aerodynamic lock, his inability to restore forward thrust, and subsequent collision with terrain.Feb 24, 2022 · N10JA · Substantial damageNTSB CEN22LA085Accident · No injuriesClass 3 · LimitedFinal reportBeech A100 · West Helena, ARThe malfunction of the propeller autofeather system after takeoff for undetermined reasons, which resulted in both propellers going into feather and a hard landing.Dec 28, 2021 · N93GT · Substantial damageNTSB ERA20CA296Accident · No injuriesClass 4 · Data collectionFinal reportBeech 55 · Nashville, TNThe pilot's inadvertent feathering of the propellers during the landing flare, which resulted in a hard landing. A factor in the accident was the instructor's failure to fully monitor the pilot's manipulation of the levers in the airplane's non-standard…Aug 24, 2020 · N8629M · Substantial damageNTSB ERA20LA202Accident · 2 fatalClass 3 · LimitedFinal reportPiper PA23 · San Juan, PRThe pilot’s intentional operation of the airplane with known deficiencies of the left engine and subsequent in-flight loss of control after takeoff. Contributing to the loss of engine power was internal contamination of the left servo fuel injector.…Jun 2, 2020 · N14181 · Substantial damageNTSB ERA20CA112Accident · Minor injuriesClass 4 · Data collectionFinal reportBeech 58 · Augusta, GAThe pilot's failure to land and stop the airplane within the available runway, which resulted in a runway overrun. Contributing to the outcome was the pilot's inadvertent feathering of both propellers during approach to landing.Feb 23, 2020 · N60SH · Substantial damageNTSB ANC19LA046Accident · No injuriesClass 3 · LimitedFinal reportCessna 208B · Lahaina, HIThe pilots’ failure to maintain a proper approach speed and their decision to continue the approach for landing, which resulted in the airplane landing long and a subsequent runway overrun.Aug 18, 2019 · N879MA · Substantial damageNTSB CEN19LA056Accident · 2 fatalLimited investigationFinal reportDouglas DC3C · Kidron, OHThe loss of airplane control after an engine flameout and auto-feather system interruption during the takeoff climb, which resulted in an impact with terrain.Jan 21, 2019 · N467KS · Substantial damage
See all 26 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\", '01046123'))
  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.