# NTSB investigations, MT: Airframe/component/system failure/malfunction 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 LAX07CA288](https://openairdocs.org/ntsb/LAX07CA288.md): Bellanca 7GCBC · Laurel, MT · Accident · No injuries · Data collection · Final report · Sep 30, 2007 · N41695 · Substantial damage > Corrosion and fatigue-induced failure of the landing gear structure. - [NTSB SEA07LA133](https://openairdocs.org/ntsb/SEA07LA133.md): Beech B-99 · Billings, MT · Accident · No injuries · Limited investigation · Final report · May 19, 2007 · N950AA · Substantial damage > The total failure of the nose landing gear actuator and the subsequent nose gear collapse during landing. - [NTSB SEA07LA002](https://openairdocs.org/ntsb/SEA07LA002.md): Cessna 340A · Kalispell, MT · Accident · No injuries · Limited investigation · Final report · Oct 2, 2006 · N1920E · Substantial damage > The fracture of the adjusting bellcrank in overstress due to binding in a linkage forward of the bell crank. - [NTSB SEA06CA094](https://openairdocs.org/ntsb/SEA06CA094.md): Harold Vander Avid Flyer · Miles City, MT · Accident · No injuries · Data collection · Final report · May 14, 2006 · N157VM · Substantial damage > Failure of the engine to propeller reduction gearbox for undetermined reasons. High vegetation was a factor. - [NTSB SEA06CA088](https://openairdocs.org/ntsb/SEA06CA088.md): Potts MA-5 · Kalispell, MT · Accident · Minor injuries · Data collection · Final report · Apr 27, 2006 · N413AC · Substantial damage > Separation of the left main landing gear during the landing roll for an undetermined reason, which resulted in the airplane nosing down. - [NTSB SEA05FA124](https://openairdocs.org/ntsb/SEA05FA124.md): Cessna 320E · Missoula, MT · Accident · Serious injuries · Field investigation · Final report · Jun 21, 2005 · N3438Q · Destroyed > Terrain clearance was not possible as a result of a right engine failure. Factors contributing to the accident included the rising terrain, foreign material being ingested into the engine's turbocharger, which obstructed the turbocharger's impeller, the… - [NTSB SEA05LA084](https://openairdocs.org/ntsb/SEA05LA084.md): Cessna T210N · Kalispell, MT · Accident · Minor injuries · Limited investigation · Final report · Apr 20, 2005 · N2AK · Destroyed > An airborne fire which was fueled by leaking hydraulic fluid (the ignition source for the fire was undetermined) from the landing gear hydraulic system located under the cockpit instrument panel due to inadequate maintenance from other maintenance personnel.… - [NTSB SEA04LA117](https://openairdocs.org/ntsb/SEA04LA117.md): Cessna 185F · Bozeman, MT · Accident · No injuries · Limited investigation · Final report · Jun 24, 2004 · N4585F · Substantial damage > The failure of the right main gear brake disk attach flange during the landing roll, due to fatigue cracks emanating from numerous corrosion pits present on the surface of the disk, leading to the right brake becoming totally inoperative, and resulting in a… - [NTSB SEA02LA182](https://openairdocs.org/ntsb/SEA02LA182.md): Cessna 172RG · Billings, MT · Accident · No injuries · Limited investigation · Final report · Sep 26, 2002 · N6525R · Substantial damage > The failure of the landing gear actuator during landing as a result of fatigue. - [NTSB SEA02LA130](https://openairdocs.org/ntsb/SEA02LA130.md): Thurmond Moni · Laurel, MT · Accident · No injuries · Limited investigation · Final report · Jul 12, 2002 · N9104S · Substantial damage > Undertorqued mounting bolts which resulted in fatigue to the wooden propeller blade and subsequent in flight separation of one of the blades while in cruise flight. An improper installation of the propeller assembly and soft terrain encountered during the… - [NTSB SEA02LA074](https://openairdocs.org/ntsb/SEA02LA074.md): Stinson 108-2 · Helena, MT · Accident · No injuries · Limited investigation · Final report · Apr 20, 2002 · N959D · Substantial damage > Fracture of the left main wheel assembly during the takeoff roll. Factors include the use of a wheel assembly not approved for the accident airplane, and the use of an oversized tire. - [NTSB SEA02FA064](https://openairdocs.org/ntsb/SEA02FA064.md): Cessna 182E · Red Lodge, MT · Accident · No injuries · Field investigation · Final report · Apr 6, 2002 · N3184Y · Substantial damage > Long term fatigue of the nose landing gear strut fork initiated by side loading which resulted in the separation of the fork from the strut and the consequent collapse of the nose gear. A contributing factor was the ditch the aircraft traversed during the… - [NTSB SEA01LA046](https://openairdocs.org/ntsb/SEA01LA046.md): Western International UH-1H · Darby, MT · Accident · 1 fatal · Limited investigation · Final report · Feb 7, 2001 · N205GL · Substantial damage > Inflight loss of a tail rotor pitch change link-to-blade grip attach bolt, resulting partial loss of tail rotor control, and subsequent entanglement of the helicopter's external load cable with a tree during emergency descent. Factors included the pilot's… - [NTSB SEA00LA128](https://openairdocs.org/ntsb/SEA00LA128.md): Keith Kinden Rebel · Libby, MT · Accident · No injuries · Limited investigation · Final report · Jul 10, 2000 · N6317Y · Substantial damage > An improper installation of a rudder control cable Nicopress sleeve by the owner/builder. The rudder control cable disconnection and the slipped cable from the sleeve were factors. - [NTSB SEA00LA032](https://openairdocs.org/ntsb/SEA00LA032.md): Cessna 140 · Helena, MT · Accident · No injuries · Limited investigation · Final report · Dec 15, 1999 · N2739N · Substantial damage > Separation of the left main landing gear. Factors include inadequate preflight inspection by the pilot, and inadequate inspection at the time of annual inspection by maintenance personnel. - [NTSB SEA99LA103](https://openairdocs.org/ntsb/SEA99LA103.md): Piper PA-22 · Billings, MT · Accident · No injuries · Limited investigation · Final report · Jul 1, 1999 · N3513A · Substantial damage > The separation of the left main landing gear shock strut for undetermined reasons. - [NTSB SEA98LA166](https://openairdocs.org/ntsb/SEA98LA166.md): Cessna 175 · Missoula, MT · Accident · No injuries · Limited investigation · Final report · Aug 15, 1998 · N8512X · Substantial damage > A complete loss of crankcase oil due to a missing oil filler tube followed by the failure of a connecting rod. Factors include encountering a small pine tree during the landing roll. - [NTSB SEA98LA146](https://openairdocs.org/ntsb/SEA98LA146.md): Garlick UH-1H · Libby, MT · Accident · Serious injuries · Limited investigation · Final report · Jul 24, 1998 · N83NW · Substantial damage > A failure of the external load cable, which became entangled in the tail rotor. - [NTSB SEA98FA089](https://openairdocs.org/ntsb/SEA98FA089.md): Mooney M20A · Canyon Creek, MT · Accident · 1 fatal · Field investigation · Final report · Jun 7, 1998 · N1048B · Destroyed > The design stress limits of the aircraft was exceeded. The pilot's inadequate preflight planning/preparation, lack of an instrument rating, poor weather evaluation and low ceilings and mountain obscuration were factors. - [NTSB SEA98LA073](https://openairdocs.org/ntsb/SEA98LA073.md): Aero Commander 500-A · Billings, MT · Accident · No injuries · Limited investigation · Final report · May 9, 1998 · N9382R · Substantial damage > Failure of the main landing gear strut outer-body to inner-body needle bearing from the lack of lubrication and the development of corrosion. An inadequate manufacturer's inspection program was a factor. - [NTSB SEA96LA219](https://openairdocs.org/ntsb/SEA96LA219.md): Kaman HH-43 B/F · Troy, MT · Accident · Minor injuries · Limited investigation · Final report · Sep 23, 1996 · N4069R · Substantial damage > failure of the freewheeling sprag unit bearings for undetermined reasons. - [NTSB SEA96IA104](https://openairdocs.org/ntsb/SEA96IA104.md): Dornier 328 · Billings, MT · Incident · No injuries · Incident investigation · Final report · May 29, 1996 · N336PH · No damage > paint overspray on the elevator trim actuator push rods, which damaged the actuator quad rings during normal operation and allowed water to enter the actuators; and the resultant freezing of the actuators. Factors relating to the incident included the… - [NTSB SEA94LA128](https://openairdocs.org/ntsb/SEA94LA128.md): Bell 204B · Libby, MT · Accident · Serious injuries · Limited investigation · Final report · May 27, 1994 · N911SW · Substantial damage > The fatigue fracture of the 42 degree gear box input pinion. Factors include unsuitable, mountainous/hilly terrain. - [NTSB SEA92LA029](https://openairdocs.org/ntsb/SEA92LA029.md): Aerospatiale AS355F1 · Billings, MT · Accident · No injuries · Limited investigation · Final report · Oct 29, 1991 · N101UC · Substantial damage > The unlatching and subsequent opening inflight of the left-rear engine cowl door. A factor contributing to the accident was the failure of company maintenance personnel to execute the manufacturer's service bulletin. - [NTSB SEA90IA161](https://openairdocs.org/ntsb/SEA90IA161.md): Boeing 727-224 · Belgrade, MT · Incident · No injuries · Incident investigation · Final report · Aug 12, 1990 · N69735 · Minor damage > The malfunction of the starter control valve. - [NTSB DEN89LA163](https://openairdocs.org/ntsb/DEN89LA163.md): Cessna A188B · Fort Benton, MT · Accident · No injuries · Limited investigation · Final report · Jun 15, 1989 · N4971Q · Substantial damage > Failure of the tailwheel assembly attaching bolts. - [NTSB DEN87IA032](https://openairdocs.org/ntsb/DEN87IA032.md): Swearingen SA226TC · Billings, MT · Incident · No injuries · Incident investigation · Final report · Dec 20, 1986 · N124AV · Minor damage > N124AV was operating as big sky airlines flt 3857, scheduled service from helena to Billings. The flt proceeded uneventfully until the apch into Billings. The flt crew stated after the incident that when the landing gear was extended, the left main gear… - [NTSB DEN87FA018](https://openairdocs.org/ntsb/DEN87FA018.md): Bell 206L-3 · Billings, MT · Accident · Serious injuries · Field investigation · Final report · Nov 7, 1986 · N3889S · Destroyed > While on takeoff from a hospital roof top helipad on an emergency medical service flt, a synchronized elevator cover blew off and struck the tail rotor. This resulted in an inflight separation of one tail rotor blade and a loss of anti-torque control. The plt… - [NTSB DEN84LA224](https://openairdocs.org/ntsb/DEN84LA224.md): Grumman G-164A · Richey, MT · Accident · No injuries · Limited investigation · Final report · Jul 15, 1984 · N6589 · Destroyed > The plt had finished spraying & was proceeding to the glendive arpt. He said that eng or prop began a sudden severe vibration which required the eng to be shut down. An emegency landing was made. The plt stated that the left wing impacted a hill which spun… - [NTSB DEN83LA121](https://openairdocs.org/ntsb/DEN83LA121.md): Piper PA-22-150 · Ennis, MT · Accident · Minor injuries · Limited investigation · Final report · May 27, 1983 · N9975D · Substantial damage > During a night flight, oil began spreading over the windshield & heavy smoke came in the cockpit through the cabin heater. The plt opened the cabin windows, reduced power & turned back toward the arpt. The oil pressure dropped to 5 PSI & the plt descended to… - [NTSB DEN83LA046](https://openairdocs.org/ntsb/DEN83LA046.md): Bell 47G-3B-2 (Soloy) · Great Falls, MT · Accident · No injuries · Limited investigation · Final report · Jan 6, 1983 · N7039J · Destroyed > While maneuvering at low altitude in search of animals, the pilot experienced a severe vibration through the flight controls. The helicopter began an uncontrolled descent and attempts to stop the descent by using the collective were unsuccessful. The… - [NTSB DEN83LA035](https://openairdocs.org/ntsb/DEN83LA035.md): Piper PA-28R-200 · Cut Bank, MT · Accident · No injuries · Limited investigation · Final report · Dec 17, 1982 · CGKBJ · Substantial damage > The aircraft experienced a total electrical failure while enroute. On arrival, the pilot selected gear down, however it would not lower. He misidentified the operation of the emergency gear down switch and pushed it up instead of down. The pilot stated that… ## 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 o.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o."occurrenceNumber" = 1 AND o."occurrenceCode" = 130) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?occurrence=130&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.