NTSB investigations: Allison 250 SER 400HP, 1975

7 cases on aircraft whose registry engine model is Allison 250 SER 400HP. 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

19692026

NTSB investigations: Allison 250 SER 400HP, 1975 per year, 1969–2026: 231 cases
1969	2
1972	3
1973	1
1974	1
1975	7
1976	7
1977	9
1978	8
1979	10
1980	16
1981	6
1982	7
1983	5
1984	3
1985	8
1986	5
1987	8
1988	3
1989	7
1990	7
1991	5
1992	2
1993	5
1994	3
1995	5
1996	7
1997	7
1998	4
1999	4
2000	3
2001	5
2002	2
2003	6
2004	5
2005	4
2006	1
2007	4
2008	2
2009	2
2010	4
2011	4
2013	2
2015	5
2016	4
2018	1
2019	1
2022	4
2023	3
2024	2
2025	1
2026	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 year(c."eventDate") = 1975 AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03013', '03012')) 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 year(c.\"eventDate\") = 1975
    AND c.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03013', '03012'))
  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 year(c."eventDate") = 1975
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03013', '03012'))
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 SEA76FTA09Accident · No injuriesClosedBell 206B · Miles City, MTDec 14, 1975 · N59495 · Substantial damage NTSB OAK76FVG27Accident · No injuriesClosedBell 206B · Alder Springs, CAOct 4, 1975 · N59549 · Substantial damage NTSB LAX76AL015Accident · Minor injuriesClosedBell 206B · Van Nuys, CAAug 26, 1975 · N59560 · Substantial damage NTSB ANC76AA011Accident · Minor injuriesClosedHughes 369HS · Deadhorse, AKJul 21, 1975 · N717ST · Substantial damage NTSB SEA7LFYE02Accident · Minor injuriesClosedHughes 369HS · Elma, WAJul 2, 1975 · N82AL · Substantial damage NTSB ANC75AA070Accident · No injuriesClosedBell 206B · Allison Lake, AKMar 25, 1975 · N58012 · Substantial damage NTSB LAX75DUJ55Accident · No injuriesClosedBell 206B · Glendale, AZJan 14, 1975 · N59383 · Substantial damage