# NTSB investigations, MT: Not determined, general

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 WPR22LA313](https://openairdocs.org/ntsb/WPR22LA313.md): Piper PA-30 · St Ignatius, MT · Accident · Minor injuries · Class 3 · Limited · Final report · Aug 23, 2022 · N4009Y · Substantial damage
  > A partial loss of power during takeoff for undetermined reasons.
- [NTSB WPR21LA032](https://openairdocs.org/ntsb/WPR21LA032.md): Cessna 172 · Billings, MT · Accident · 1 fatal · Class 3 · Limited · Final report · Oct 31, 2020 · N124TW · Substantial damage
  > The pilot’s failure to maintain the proper descent glide path while on final approach for reasons that could not be determined from available evidence.
- [NTSB WPR20LA128](https://openairdocs.org/ntsb/WPR20LA128.md): Piper PA31T · Billings, MT · Accident · 1 fatal · Class 3 · Limited · Final report · Apr 20, 2020 · N926K · Destroyed
  > The degraded airplane performance after takeoff for reasons that could not be determined from available evidence.
- [NTSB WPR20LA068](https://openairdocs.org/ntsb/WPR20LA068.md): Cessna 172Q · Big Timber, MT · Accident · No injuries · Class 3 · Limited · Final report · Jan 17, 2020 · N96145 · Substantial damage
  > A loss of engine power during climbout for undetermined reasons.
- [NTSB WPR19LA134](https://openairdocs.org/ntsb/WPR19LA134.md): Cessna A185 · Kalispell, MT · Accident · No injuries · Class 3 · Limited · Final report · May 4, 2019 · N185FT · Substantial damage
  > The loss of directional control during landing for reasons that could not be determined based on available evidence.
- [NTSB WPR17LA046](https://openairdocs.org/ntsb/WPR17LA046.md): Softex Invest V-24L · Paradise, MT · Accident · Serious injuries · Limited investigation · Final report · Jan 3, 2017 · N710XP · Substantial damage
  > A partial loss of power during cruise flight for reasons that could not be determined because postaccident examination of the engines did not reveal evidence of any preimpact mechanical malfunctions or failures that would have precluded normal operation.
- [NTSB WPR16FA182](https://openairdocs.org/ntsb/WPR16FA182.md): Beech 95 B55 (T42A) · Broadus, MT · Accident · 3 fatal · Field investigation · Final report · Sep 17, 2016 · N413D · Substantial damage
  > The airplane's departure from cruise flight for reasons that could not be determined based on the available information.
- [NTSB WPR16FA170](https://openairdocs.org/ntsb/WPR16FA170.md): Cessna 182 · Clinton, MT · Accident · 2 fatal · Field investigation · Final report · Aug 28, 2016 · N9936T · Destroyed
  > The sudden right turn on approach to landing for reasons that could not be determined because postaccident examination did not reveal any anomalies that would have precluded normal operation.
- [NTSB WPR16LA171](https://openairdocs.org/ntsb/WPR16LA171.md): Cessna 310R · Schafer Meadows, MT · Accident · No injuries · Class 3 · Limited · Final report · Jun 26, 2016 · N455TB · Substantial damage
  > A loss of directional control while landing, which resulted in a runway excursion and landing gear collapse for reasons that could not be determined.
- [NTSB WPR15LA191](https://openairdocs.org/ntsb/WPR15LA191.md): Cessna 180A · Polson, MT · Accident · No injuries · Limited investigation · Final report · Jun 19, 2015 · N9699B · Substantial damage
  > A total loss of engine power during approach for reasons that could not be determined because postaccident examination revealed no anomalies that would have precluded normal operation.
- [NTSB WPR15LA087](https://openairdocs.org/ntsb/WPR15LA087.md): Piper PA 28-140 · Helena, MT · Accident · Minor injuries · Limited investigation · Final report · Jan 20, 2015 · N4666R · Substantial damage
  > Loss of engine power after takeoff for reasons that could not be determined because postaccident examination did not reveal any evidence of an anomaly that would have precluded normal operation.
- [NTSB WPR14LA232](https://openairdocs.org/ntsb/WPR14LA232.md): Cessna 150F · Ronan, MT · Accident · Minor injuries · Limited investigation · Final report · Jun 6, 2014 · N3376B · Substantial damage
  > A loss of engine power for reasons that could not be determined due to insufficient evidence.
- [NTSB WPR12LA263](https://openairdocs.org/ntsb/WPR12LA263.md): Cessna A185F · Winnett, MT · Accident · No injuries · Limited investigation · Final report · Jun 13, 2012 · CG-ZVF · Substantial damage
  > A momentary loss of engine power, which led to an emergency descent at night during which the airplane collided with a wire. The reason for the loss of engine power could not be determined because postaccident examination and operation did not reveal any…
- [NTSB WPR12LA111](https://openairdocs.org/ntsb/WPR12LA111.md): Enstrom F28 · Kalispell, MT · Accident · No injuries · Limited investigation · Final report · Feb 20, 2012 · N51727 · Substantial damage
  > A total loss of engine power for reasons that could not be determined because postaccident examination did not reveal any anomalies that would have precluded normal operation.
- [NTSB WPR11LA272](https://openairdocs.org/ntsb/WPR11LA272.md): Air Tractor AT-301 · Hogeland, MT · Accident · 1 fatal · Limited investigation · Final report · Jun 21, 2011 · N3661B · Substantial damage
  > Collision with the ground while maneuvering at low altitude for reasons that could not be determined because postaccident examination did not reveal any anomalies that would have precluded normal operation.
- [NTSB WPR10LA476](https://openairdocs.org/ntsb/WPR10LA476.md): Cessna 310R · Great Falls, MT · Accident · No injuries · Limited investigation · Final report · Sep 28, 2010 · N455TB · Substantial damage
  > The uncommanded retraction of the right main landing gear during taxi due to the failure of the landing gear extension system to move the right main gear upper side link into the locked position for undetermined reasons.
- [NTSB CEN10LA496](https://openairdocs.org/ntsb/CEN10LA496.md): Cessna 182T · Mosby, MT · Accident · No injuries · Limited investigation · Final report · Aug 18, 2010 · N1142U · Substantial damage
  > A partial loss of engine power for undetermined reasons during an en route climb.
- [NTSB WPR10LA343](https://openairdocs.org/ntsb/WPR10LA343.md): Ercoupe 415 · Whitehall, MT · Accident · No injuries · Limited investigation · Final report · Jul 9, 2010 · N87349 · Substantial damage
  > A loss of engine power for undetermined reasons.
- [NTSB WPR09LA179](https://openairdocs.org/ntsb/WPR09LA179.md): Cessna 182 · Kalispell, MT · Accident · No injuries · Limited investigation · Final report · Apr 4, 2009 · N6433A · Substantial damage
  > A partial loss of engine power during a go-around for undetermined reasons. Contributing to the accident was a fatigue failure of the right main landing gear spring.
- [NTSB SEA08FA135](https://openairdocs.org/ntsb/SEA08FA135.md): Beech 1900C · Billings, MT · Accident · 1 fatal · Field investigation · Final report · May 23, 2008 · N195GA · Destroyed
  > The pilot's failure to maintain aircraft control during the initial climb for undetermined reasons.

## 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 f.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_findings.parquet' f WHERE starts_with(f."findingCode", '05000000'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-findings/05000000/cases?state=MT

---
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.