# NTSB investigations, MT: Loss of visual reference

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 WPR25LA194](https://openairdocs.org/ntsb/WPR25LA194.md): Bellanca 7GCBC · Helena, MT · Accident · No injuries · Class 4 · Limited · Final report · Jun 30, 2025 · N50476 · Substantial damage
  > The pilot’s failure to maintain directional control of the airplane during landing.
- [NTSB GAA17CA225](https://openairdocs.org/ntsb/GAA17CA225.md): Weatherly 620B · Lewistown, MT · Accident · No injuries · Data collection · Final report · Apr 10, 2017 · N9004M · Substantial damage
  > The pilot’s failure to maintain altitude during low-altitude maneuvers in flat light conditions.
- [NTSB WPR15FA247](https://openairdocs.org/ntsb/WPR15FA247.md): Cessna 172P · Townsend, MT · Accident · 2 fatal · Field investigation · Final report · Aug 20, 2015 · N62731 · Substantial damage
  > The non-instrument-rated pilot's decision to conduct a cross-country flight over a mountain range in dark night conditions with limited night flight experience, which resulted in a collision with mountainous terrain.
- [NTSB WPR14FA231](https://openairdocs.org/ntsb/WPR14FA231.md): Grumman G 21A · Sula, MT · Accident · 1 fatal · Field investigation · Final report · Jun 17, 2014 · N888GG · Destroyed
  > The pilot's decision to continue flight into deteriorating weather conditions in an airplane not maintained for instrument flight, which resulted in a loss of control due to spatial disorientation.
- [NTSB WPR10FA273](https://openairdocs.org/ntsb/WPR10FA273.md): Piper PA-34-220T · Lincoln, MT · Accident · 2 fatal · Field investigation · Final report · May 30, 2010 · N44MC · Substantial damage
  > The pilot’s decision to continue flight into an area of low ceilings and low visibility and his failure to maintain sufficient clearance from mountainous terrain.

## 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" = 'MT' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT s.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s."tier2Number" = '402' AND s.case_mkey IN (SELECT case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' WHERE "isDefiningEvent"))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/402/sequence?state=MT

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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.