# NTSB investigations, SD: Midair collision

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 CHI91LA270](https://openairdocs.org/ntsb/CHI91LA270.md): Cessna 150L · Watertown, SD · Accident · Minor injuries · Limited investigation · Final report · Aug 24, 1991 · N16098 · 2 aircraft · Substantial damage
  > Attempted formation flying with N4535E by the pilot of N16098. Factors associated with the collision were: nonperformance of preflight planning, and failure to follow procedures and directives by the pilot of N16098.
- [NTSB DEN90DTK01](https://openairdocs.org/ntsb/DEN90DTK01.md): Piper PA-36-375 · Woonsocket, SD · Accident · 1 fatal · Final report · May 8, 1990 · N3634E · 2 aircraft · Destroyed
  > Failure of the pilot of N3634E to follow the briefed plan of operation, and failure of both pilots to see-and-avoid each other (inadequate visual lookout).

## 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 c."eventStateOrRegion" = 'SD' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT o.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o."occurrenceNumber" = 1 AND o."occurrenceCode" = 270)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?occurrence=270&state=SD

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OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.