# NTSB investigations, 2020: Flight control sys malf/fail

NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports.

## Latest cases

- [NTSB DCA21WA033](https://openairdocs.org/ntsb/DCA21WA033.md): Boeing 737 · Capetown, South Africa · Incident · Class 5 · Foreign · Nov 22, 2020 · ZS-OAF · No damage
- [NTSB WPR21LA039](https://openairdocs.org/ntsb/WPR21LA039.md): Agusta A109 · Los Angeles, CA · Accident · Serious injuries · Class 3 · Limited · Final report · Nov 6, 2020 · N109EX · Substantial damage
  > The loss of tail rotor control due to the separation of the tail rotor duplex bearing ring nut from the thrust sleeve, which resulted in the loss of helicopter control.
- [NTSB DCA20WA151](https://openairdocs.org/ntsb/DCA20WA151.md): Bombardier CL600 2D24 · Gallivare, Sweden · Incident · No injuries · Class 5 · Foreign · Sep 10, 2020 · EC-ACD · Minor damage
- [NTSB WPR20LA301](https://openairdocs.org/ntsb/WPR20LA301.md): Lake LA4 · Rawlins, WY · Accident · 1 fatal · Class 3 · Limited · Final report · Aug 25, 2020 · N93AB · Substantial damage
  > The pilot’s decision to depart despite a known mechanical trim malfunction and with a high-density altitude and the airplane at or above its maximum gross weight.
- [NTSB CEN20WA434](https://openairdocs.org/ntsb/CEN20WA434.md): Raytheon Hawker · Le Bourget, France · Incident · Class 5 · Foreign · Aug 21, 2020 · F-HREX · No damage
- [NTSB ERA20CA246](https://openairdocs.org/ntsb/ERA20CA246.md): Piper PA22 · Cortland, NY · Accident · Minor injuries · Class 4 · Data collection · Final report · Jul 13, 2020 · N2716P · Substantial damage
  > The mechanic’s incorrect rigging of the aileron control cables, which resulted in a reversal of aileron control inputs applied by the pilot during the takeoff. Also causal was the mechanic’s inadequate post-maintenance inspection and the pilot's inadequate…
- [NTSB CEN20LA259](https://openairdocs.org/ntsb/CEN20LA259.md): Sopwith Type 9400 · Van Alstyne, TX · Accident · Minor injuries · Class 3 · Limited · Final report · Jul 3, 2020 · N5539 · Substantial damage
  > An inflight loss of aileron control due to movement of a control connector.
- [NTSB ERA20CA232](https://openairdocs.org/ntsb/ERA20CA232.md): Ayres S2R · Perry, GA · Accident · No injuries · Class 4 · Data collection · Final report · Jun 27, 2020 · N4032L · Substantial damage
  > The reported malfunction of the aileron flight control system during takeoff for reasons that could not be determined.
- [NTSB CEN20LA173](https://openairdocs.org/ntsb/CEN20LA173.md): Titan Titan Tornado S · Haskell, OK · Accident · Serious injuries · Class 3 · Limited · Final report · May 9, 2020 · N318WH · Substantial damage
  > The student pilot/builder’s addition of winglets to the stabilator, which resulted in flutter and overstress failure of the stabilator control horn.
- [NTSB ENG20LA031](https://openairdocs.org/ntsb/ENG20LA031.md): Airbus Helicopters AS350 · Clewiston, FL · Incident · No injuries · Class 3 · Limited · Final report · May 3, 2020 · N1WT · No damage
  > Seizure of the hydraulic pump pulley bearing due to its improper installation by the manufacturer, leading to a failure of the hydraulic pump belt and the resultant partial loss of hydraulic assistance to the pedals.
- [NTSB ERA20CA168](https://openairdocs.org/ntsb/ERA20CA168.md): Dayton-Wright DH-4 · Bowling Green, KY · Accident · No injuries · Class 4 · Data collection · Final report · May 2, 2020 · N32517 · Substantial damage
  > A primary control (aileron) system anomaly that progressively worsened during a test flight that resulted in a loss of control. The reason for the anomaly was not determined due to impact damage.
- [NTSB WPR20LA135](https://openairdocs.org/ntsb/WPR20LA135.md): Piper PA-23-250 · Hemet, CA · Accident · 1 fatal · Class 3 · Limited · Final report · Apr 30, 2020 · N6521Y · Substantial damage
  > Maintenance personnel’s failure to properly inspect and replace damaged aileron control cables, which resulted in fatigue separation of the aileron control cable and loss of control of the aircraft.
- [NTSB DCA20LA100](https://openairdocs.org/ntsb/DCA20LA100.md): Sikorsky S61 · Camp Dwyer, Afghanistan · Accident · Serious injuries · Class 3 · Limited · Final report · Apr 20, 2020 · N908CH · Substantial damage
  > Fatigue cracking of the auxiliary servo cylinder’s pedal damper check valve housing and its bolts, which caused the sudden and uncommanded movement of the helicopter’s left pedal and a subsequent left yaw that continued until ground impact. Contributing to…
- [NTSB WPR20WA317](https://openairdocs.org/ntsb/WPR20WA317.md): Robinson R44 · Mareeba Aerodrome, Australia · Accident · No injuries · Class 5 · Foreign · Apr 3, 2020 · VH-RJN · No damage
- [NTSB ANC20FA024](https://openairdocs.org/ntsb/ANC20FA024.md): Cessna 305 · Mokuleia, HI · Accident · 2 fatal · Class 3 · Field · Final report · Feb 22, 2020 · N65070 · Substantial damage
  > A separation of the left rudder cable due to inadequate maintenance, which resulted in an in-flight loss of control and impact with terrain.
- [NTSB DCA20WA074](https://openairdocs.org/ntsb/DCA20WA074.md): Boeing 757 · San Jose, Costa Rica · Incident · No injuries · Foreign investigation · Feb 9, 2020 · N200UU · No damage
  > The Consejo Technico de Aviacion Civil (CTAC)of Costa Rica notified the NTSB of an incident involving a Boeing 757-2B7, which occurred on February 9, 2020. The NTSB has appointed a U.S. Accredited Representative to assist under the provisions of ICAO Annex 13…
- [NTSB ENG20WA034](https://openairdocs.org/ntsb/ENG20WA034.md): Bombardier CL600 2C10 · Lyon Saint Exupéry Airport, France · Incident · No injuries · Foreign investigation · Jan 23, 2020 · F-GRZL · No damage
  > The BEA of France has notified the NTSB of an incident involving a Bombardier CL600-2C10 airplane that occurred on January 23, 2020. The NTSB has appointed a U.S. Accredited Representative to assist the BEA of France's investigation under the provisions of…

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
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 year(c."eventDate") = 2020
  AND c."mKey" IN (SELECT s.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s."tier2Number" = '333' AND s.case_mkey IN (SELECT case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' WHERE "isDefiningEvent"))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/333/sequence?year=2020

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