NTSB investigations: Cessna 421B

6 cases on aircraft the registry lists as Cessna 421B, where the first occurrence was “Loss of control - on ground/water”. 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

19822026

NTSB investigations: Cessna 421B per year, 1982–2026: 6 cases
1982	1
1983	1
1984	1
1990	1
1993	1
2004	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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('2076014') AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 260)) 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.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('2076014')
      AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o.\"occurrenceNumber\" = 1 AND o.\"occurrenceCode\" = 260))
  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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('2076014')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 260))
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 SEA04LA108Accident · No injuriesLimited investigationFinal reportCessna 421B · Bend, OROn ground encounter with terrain during the takeoff roll as a result of the left side brake not operating. Inadequate maintenance inspection, overload of the nose landing gear and soft terrain were factors.Jun 16, 2004 · N332CC · Substantial damage NTSB FTW93LA254Accident · Serious injuriesLimited investigationFinal reportCessna 421B · Oak Grove, LADirectional control not maintained by the pilot for undetermined reasons. Factors were a fence and trees.Sep 6, 1993 · N747BW · Substantial damage NTSB MIA90LA186Accident · No injuriesLimited investigationFinal reportCessna 421B · Pompano Beach, FLThe failure of the pilot to initiate a go-around due to being high on final approach and as a result, failure to attain the correct point of touchdown and his excessive application of brakes which resulted in failure of the right main tire and loss of…Sep 22, 1990 · N41JT · Substantial damage NTSB FTW84FA296Accident · No injuriesField investigationFinal reportCessna 421B · El Paso, TXFirst evidence of landing gear tire marks were found aprx 4,000 ft down the rwy, right of centerline and continued until the acft rolled off the right side of the rwy. All 3 landing gear collapsed in the soft dirt and gravel. According to the plt, when the…Jun 30, 1984 · N554 · Substantial damage 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 DEN82DA030Accident · No injuriesFinal reportCessna 421B · Spanish Fork, UTThe aircraft tookoff from an airport with slush on the runway, about 10 minutes later, the pilot landed at another airport. The runway at the destination airport was covered with dry snow. During touchdown, the aircraft veered left and hit a snowbank beside…Feb 10, 1982 · N5439J · Substantial damage