NTSB investigations: Allison 250-C20 series, AL

8 cases on aircraft whose registry engine model is Allison 250-C20 series. Aircraft are matched to the registry by N-number and event date, checked against the reported serial number, make and model, so older matches can be wrong.

Defining event

Finding

Phase of flight

Aircraft model

Cases per year

19882026

NTSB investigations: Allison 250-C20 series, AL per year, 1988–2026: 8 cases
1988	1
2007	1
2008	1
2014	3
2015	1
2021	1

Where

Open the map

Latest cases

Query with 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 c."eventStateOrRegion" = 'AL' AND c."eventCountry" = 'USA' AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03020')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC

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.\"eventStateOrRegion\" = 'AL' AND c.\"eventCountry\" = 'USA'
    AND c.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03020'))
  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.

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."eventStateOrRegion" = 'AL' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03020'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC

Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.

NTSB ERA21LA269Accident · 1 fatalClass 3 · LimitedFinal reportGarlick Helicopters OH-58A+ · Alpine, ALThe pilot’s failure to maintain clearance from powerlines during a low-level aerial application flight, resulting in main rotor blade impact with a fiber-optic cable, a loss of control, and the helicopter’s subsequent impact with terrain.Jun 25, 2021 · N372NS · Substantial damage NTSB ERA16LA015Accident · No injuriesLimited investigationFinal reportBell 206L 3 · Dickinson, ALThe improper installation by company maintenance personnel of the securing hardware of a tail rotor driveshaft section, which resulted in that section of tail rotor driveshaft disconnecting and a complete loss of tail rotor thrust.Oct 15, 2015 · N206CJ · Substantial damage NTSB ERA15CA055Accident · No injuriesData collectionFinal reportMcdonnell Douglas Helicopter MD500 · Decatur, ALAn undetermined pilot's failure to maintain clearance from an electrical transmission tower resulting in substantial damage to a main rotor blade. Postaccident investigation could not determine which of two pilots was flying the helicopter at the time the…Nov 18, 2014 · N8371F · Substantial damage NTSB ERA15CA018Accident · No injuriesData collectionFinal reportBell 206B · Prattville, ALThe pilot's improper fuel planning, which resulted in a total loss of engine power due to fuel exhaustion.Oct 16, 2014 · N59541 · Substantial damage NTSB ERA14FA396Accident · 2 fatalField investigationFinal reportMcdonnell Douglas Helicopter 369E · Northport, ALAn inadvertent collision with a utility wire for reasons that could not be determined from recorded data and examination of the helicopter and accident site.Aug 19, 2014 · N444RS · Substantial damage NTSB NYC08CA309Accident · No injuriesData collectionFinal reportBell 206B · Eutaw, ALThe pilot's inadequate preflight inspection.Sep 9, 2008 · N206WA · Substantial damage NTSB MIA07FA098Accident · 1 fatalField investigationFinal reportHughes 369A · Moulton, ALThe separation of a main rotor blade from its tension torsion bar for an undetermined reason.May 13, 2007 · N468WE · Destroyed NTSB ATL89FA051Accident · No injuriesField investigationFinal reportBell 206B · Pinson, ALTwo FAA inspectors were conducting currency training when the helicopter landed hard during a practice power recovery autorotation. The pilot had delayed in applying power and collective pitch. Upon contact with the ground, all engine instruments indicated…Dec 2, 1988 · N3TV · Substantial damage