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Empennage structure, general

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NTSB finding · Aircraft › Aircraft structures › Empennage structure

All 14 cases9 in the probable cause
Cases
14
In the probable cause
9 (64%)
Fatal cases
7
NTSB code
01035500

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\", '01035500') 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\", '01035500'))
  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\", '01035500') 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 · 14

NTSB ERA23FA045Accident · 2 fatalClass 3 · FieldFinal reportBearhawk Patrol · Hanover Township, PAThe pilot’s decision to unlatch his seatbelt during flight, which allowed him to exit the airplane and impact the tail, resulting in a loss of control and impact with terrain.Oct 29, 2022 · N964RS · Substantial damageNTSB DCA20LA107Accident · No injuriesClass 3 · LimitedFinal reportBoeing 737 · Victorville, CAImproper installation of dorsal fin attach bolts which caused the dorsal fin to separate during flight, substantially damaging the left horizontal stabilizer.May 19, 2020 · N820TJ · Substantial damageNTSB GAA16CA308Accident · No injuriesData collectionFinal reportCessna 208 · Fort Dodge, IAThe flight crew's failure to install the tail stand prior to passenger boarding, which resulted in a tail strike.Jun 5, 2016 · N750Z · Substantial damageNTSB CEN15FA268Accident · 1 fatalField investigationFinal reportPiper PA 32 · Cuba, MOThe pilot's continued flight into thunderstorm activity, which resulted in his loss of airplane control, the exceedance of the airplane's design limits, and its subsequent in-flight breakup. Contributing to the accident was the pilot's reliance on onboard…Jun 14, 2015 · N2966X · DestroyedNTSB ERA13CA195Accident · No injuriesData collectionFinal reportPhoenix Air U15 · Foscoe, NCThe motorized glider’s encounter with clear air turbulence, which resulted in substantial damage to the empennage.Apr 6, 2013 · N94DK · Substantial damageNTSB WPR13FA086Accident · 2 fatalField investigationFinal reportBeech V35A · Woody, CAAn in-flight encounter with icing conditions during descent, which resulted in the airplane exceeding its critical angle-of-attack and experiencing an aerodynamic stall followed by an in-flight breakup.Jan 7, 2013 · N35SD · DestroyedNTSB CEN13FA073Accident · 1 fatalField investigationFinal reportCessna 421C · Wells, TXThe pilot’s decision to continue the flight into an area of extreme weather, which led to the in-flight encounter with a thunderstorm and structural failure of the wings and tail.Nov 27, 2012 · N67SR · Substantial damageNTSB CEN12LA531Accident · No injuriesLimited investigationFinal reportRistine Avid Mark IV · Poplar Grove, ILThe failure of the lower right side longeron tail-spring support area during landing due to excessive corrosion.Aug 9, 2012 · N1328L · Substantial damageNTSB WPR12MA034Accident · 5 fatalMajor investigationFinal reportEurocopter EC 130 B4 · Pukoo, HIThe pilot's failure to maintain clearance from mountainous terrain while operating in marginal weather conditions, which resulted in the impact of the horizontal stabilizer and lower forward portion of the fenestron with ground and/or vegetation and led to…Nov 10, 2011 · N11QV · Substantial damageNTSB ERA12FA018Accident · 1 fatalField investigationFinal reportBerger Michael A Waiex · Washington, GAThe in-flight failure of the aircraft’s Y-tail attachment structure during maneuvering flight due to overload. Contributing to the accident was, the kit manufacturer’s use of 14 CFR Part 23, Appendix A design guidelines intended for a conventional tail…Oct 22, 2011 · N75654 · Substantial damage
See all 14 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\", '01035500'))
  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.