# NTSB investigations: Helio H-391B, WA

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 SEA92LA191](https://openairdocs.org/ntsb/SEA92LA191.md): Helio H-391B · Edmonds, WA · Accident · No injuries · Limited investigation · Final report · Aug 26, 1992 · N4431U · Destroyed
  > The partial loss of engine power when an exhaust valve seized in the open position and the water where the pilot was forced to land, which resulted in an acft nose over on touchdown.
- [NTSB SEA82FYE30](https://openairdocs.org/ntsb/SEA82FYE30.md): Helio H-391B · Bellingham, WA · Accident · No injuries · Closed · May 29, 1981 · N316HW · Substantial damage
- [NTSB SEA66A0014](https://openairdocs.org/ntsb/SEA66A0014.md): Helio Acft H-391B · Mead, WA · Accident · 1 fatal · Closed · Aug 19, 1965 · N4132D · Destroyed

## 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" = 'WA' 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 ('4300106'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=4300106&state=WA

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