# NTSB investigations: Helio H-391B, MI

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 CEN25LA325](https://openairdocs.org/ntsb/CEN25LA325.md): Helio H-391B · Monroe, MI · Accident · No injuries · Class 4 · Limited · Final report · Aug 18, 2025 · N4431U · Substantial damage
  > The pilot’s failure to maintain directional control during the landing roll with a crosswind.
- [NTSB CHI90LA031](https://openairdocs.org/ntsb/CHI90LA031.md): Helio H-391B · Plainwell, MI · Accident · No injuries · Limited investigation · Final report · Nov 20, 1989 · N8750R · Substantial damage
  > Failure of the crosswind landing gear system to engage on the left main gear due to improper rigging adjustment by maintenance personnel. Factors related to the accident were: unfavorable wind conditions (gusts and quartering crosswind) and soft terrain in…
- [NTSB CHI83LA248](https://openairdocs.org/ntsb/CHI83LA248.md): Helio H-391B · Croton, MI · Accident · No injuries · Limited investigation · Final report · Jun 5, 1983 · N4119D · Substantial damage
  > The acft collided with wires on an approach to a lake.

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

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

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