# NTSB investigations: Cessna 421C, 1990

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 LAX90LA259](https://openairdocs.org/ntsb/LAX90LA259.md): Cessna 421C · Lancaster, CA · Accident · No injuries · Limited investigation · Final report · Jul 18, 1990 · N6089X · Substantial damage
  > The accident was eroded ignition spark plug electrodes and maintenance personnel neglecting to adjust spark plug electrodes and maintenance personnel neglecting to adjust spark plug gap. The rough terrain in which the aircraft landed was a factor in the…
- [NTSB DEN90FA085](https://openairdocs.org/ntsb/DEN90FA085.md): Cessna 421-C · Boulder, CO · Accident · 2 fatal · Field investigation · Final report · Apr 1, 1990 · N2655V · Destroyed
  > A loss of airplane control as a result control interference by the passenger following a struggle between the pilot and the passenger.

## 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") = 1990
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('2076016', '2076017'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=2076016&year=1990

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