NTSB investigations: Cessna 421B, MI

7 cases on aircraft the registry lists as Cessna 421B. 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

19742026

NTSB investigations: Cessna 421B, MI per year, 1974–2026: 7 cases
1974	1
1979	1
1980	2
1983	1
1995	2

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" = 'MI' AND c."eventCountry" = 'USA' AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('2076014')) 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\" = 'MI' AND c.\"eventCountry\" = 'USA'
    AND c.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('2076014'))
  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" = 'MI' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('2076014'))
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 CHI96LA028Accident · No injuriesLimited investigationFinal reportCessna 421 · Romeo, MIthe failure of the pilot to maintain sufficient airspeed during landing, causing the inadvertent stall. A factor was the icing conditions.Nov 12, 1995 · N1588G · Substantial damage NTSB CHI95FA328Accident · 1 fatalField investigationFinal reportCessna 421B · Coldwater, MIfailure of the pilot to maintain adequate airspeed, while maneuvering (turning) at low altitude, which resulted in an inadvertent stall and collision with the terrain. Factors relating to the accident were: the adverse weather conditions, and the lack of…Sep 21, 1995 · N14A · Destroyed NTSB CHI84LA064Accident · No injuriesLimited investigationFinal reportCessna 421 · Harbor Springs, MIThe plt stated that an overboost occurred on the right eng during the takeoff roll. He pulled off power on both engs but the acft slid off the rwy into a snowbank.Dec 17, 1983 · N7557Q · Substantial damage NTSB CHI81DAMS2Accident · 5 fatalClosedCessna 421B · Muskegon, MIDec 29, 1980 · N9394A · Destroyed NTSB CHI81FEC06Accident · Minor injuriesClosedCessna 421B · Detroit, MINov 26, 1980 · N200SM · Destroyed NTSB CHI79FEM16Accident · No injuriesClosedCessna 421B · Cadillac, MIFeb 28, 1979 · N699DT · Substantial damage NTSB CHI74FEC30Accident · No injuriesClosedCessna 421B · Flint, MIFeb 12, 1974 · N5998M · Substantial damage