# NTSB investigations: Lycoming TI0-540 series, MT 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 WPR25LA301](https://openairdocs.org/ntsb/WPR25LA301.md): Piper PA-24-260 · West Yellowstone, MT · Accident · No injuries · Class 3 · Limited · Preliminary report · Jun 29, 2025 · N9366P · Substantial damage > On June 29, 2025, at 1033 mountain daylight time, a Piper PA-24-260, N9366P, was substantially damaged when it was involved in an accident near West Yellowstone, Montana. The pilot was not injured. The airplane was operated as a Title 14 Code of Federal… - [NTSB WPR16LA073](https://openairdocs.org/ntsb/WPR16LA073.md): Cessna T206H · Billings, MT · Accident · Minor injuries · Limited investigation · Final report · Feb 8, 2016 · N562H · Substantial damage > The pilot’s failure to attain a proper flare during landing in gusting wind conditions and low-level wind shear, which resulted in a hard landing and a subsequent loss of directional control. - [NTSB WPR14LA220](https://openairdocs.org/ntsb/WPR14LA220.md): Aero Commander Callair A 9B · Gardiner, MT · Accident · Serious injuries · Limited investigation · Final report · Jun 2, 2014 · N7292V · Substantial damage > The pilot’s inadequate preflight planning and his subsequent takeoff with the airplane over its allowable gross weight in high density altitude conditions, which degraded the airplane’s climb performance and led to a subsequent forced landing. - [NTSB SEA05LA032](https://openairdocs.org/ntsb/SEA05LA032.md): Aerostar 601 · Hamilton, MT · Accident · No injuries · Limited investigation · Final report · Dec 30, 2004 · N601DF · Destroyed > A partial loss of engine power due to the lack of lubrication and subsequent failure of the left engine's right turbocharger for undetermined reasons, and subsequent forced landing after takeoff. A factor was the unsuitable terrain for the forced landing. - [NTSB SEA98FA101](https://openairdocs.org/ntsb/SEA98FA101.md): Piper PA-46-350P · Bigfork, MT · Accident · 2 fatal · Field investigation · Final report · Apr 11, 1998 · N9247W · Destroyed > The pilot's failure to maintain terrain clearance for undetermined reasons. Contributing factors were the mountainous terrain, trees, dark night conditions, clouds and pilot fatigue. - [NTSB DEN88LA197](https://openairdocs.org/ntsb/DEN88LA197.md): Piper PA-24-260C · Hamilton, MT · Accident · Serious injuries · Limited investigation · Final report · Sep 2, 1988 · N9436P · Substantial damage > The private plt was descending to the destination arpt at the conclusion of a 3.5 hr x-country flight. The plt said he selected the right main fuel tank and flew until the 'fuel was low to the point of exhaustion.' During a right turn, with the gear extended,… - [NTSB DEN87LA067](https://openairdocs.org/ntsb/DEN87LA067.md): Piper PA-31-350 · Missoula, MT · Accident · No injuries · Limited investigation · Final report · Mar 19, 1987 · N3529W · 2 aircraft · Minor damage > The plt of the Piper navajo was taxiing to the active rwy for an IFR departure, directed his attention to the departure procedure chart in the cockpit, and collided with the tail of a swearingen acft holding short of the rwy awaiting takeoff clearance. - [NTSB DEN84FA121](https://openairdocs.org/ntsb/DEN84FA121.md): Aero Commander 500-B · Miles City, MT · Accident · Serious injuries · Field investigation · Final report · Mar 31, 1984 · N743W · Destroyed > The plt said that when he called on the radio prior to the approach for an altimeter setting the reply was '30.11 or 30.12, something like that.' The acft altimeter was found after the accident set at 30.22 inches of mercury. The visibility was described as 1… - [NTSB DEN81FTA12](https://openairdocs.org/ntsb/DEN81FTA12.md): Aero Comdr A-9B · Park City, MT · Accident · 1 fatal · Closed · Jul 31, 1981 · N7781V · Destroyed - [NTSB DEN81DTI07](https://openairdocs.org/ntsb/DEN81DTI07.md): Aero Comdr A9B · Townsend, MT · Accident · No injuries · Closed · May 9, 1981 · N7949V · Substantial damage - [NTSB SEA79FTA04](https://openairdocs.org/ntsb/SEA79FTA04.md): Piper PA-24 · Billings, MT · Accident · No injuries · Closed · Dec 2, 1978 · N8758P · Substantial damage - [NTSB SEA76FTA18](https://openairdocs.org/ntsb/SEA76FTA18.md): Piper PA-24 · Ekalaka, MT · Accident · No injuries · Closed · Oct 18, 1975 · N11CG · Substantial damage - [NTSB SEA76FTA04](https://openairdocs.org/ntsb/SEA76FTA04.md): Piper PA-24 · Lewiston, MT · Accident · No injuries · Closed · Aug 28, 1975 · N8881P · Substantial damage - [NTSB SEA70DDG15](https://openairdocs.org/ntsb/SEA70DDG15.md): Piper PA-32 · Three Forks, MT · Accident · No injuries · Closed · Jun 30, 1970 · N4193W · Substantial damage - [NTSB SEA70FDG07](https://openairdocs.org/ntsb/SEA70FDG07.md): Piper PA-24 · Wisdom, MT · Accident · No injuries · Closed · May 7, 1970 · N9057P · Substantial damage - [NTSB SEA69D0174](https://openairdocs.org/ntsb/SEA69D0174.md): Aero Comdr 500-B · Belgrade, MT · Accident · No injuries · Closed · Jan 8, 1969 · N4918 · Substantial damage - [NTSB SEA68F0208](https://openairdocs.org/ntsb/SEA68F0208.md): Piper PA-24 · Pryor, MT · Accident · No injuries · Closed · Oct 27, 1967 · N8551P · Substantial damage ## 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 x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41533')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=41533&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.