NTSB investigations, WY
365 cases where the phase of flight was Enroute.
Cases per year
| 1964 | 5 |
|---|---|
| 1965 | 4 |
| 1966 | 6 |
| 1967 | 10 |
| 1968 | 10 |
| 1969 | 12 |
| 1970 | 13 |
| 1971 | 5 |
| 1972 | 8 |
| 1973 | 15 |
| 1974 | 7 |
| 1975 | 10 |
| 1976 | 9 |
| 1977 | 11 |
| 1978 | 11 |
| 1979 | 6 |
| 1980 | 11 |
| 1981 | 11 |
| 1982 | 12 |
| 1983 | 11 |
| 1984 | 10 |
| 1985 | 5 |
| 1986 | 9 |
| 1987 | 4 |
| 1988 | 6 |
| 1989 | 5 |
| 1990 | 8 |
| 1991 | 7 |
| 1992 | 8 |
| 1993 | 4 |
| 1994 | 8 |
| 1995 | 2 |
| 1996 | 4 |
| 1997 | 2 |
| 1998 | 7 |
| 1999 | 5 |
| 2000 | 7 |
| 2001 | 5 |
| 2002 | 1 |
| 2003 | 4 |
| 2004 | 6 |
| 2005 | 4 |
| 2007 | 4 |
| 2008 | 4 |
| 2009 | 2 |
| 2010 | 3 |
| 2011 | 6 |
| 2012 | 8 |
| 2013 | 2 |
| 2014 | 3 |
| 2015 | 2 |
| 2017 | 1 |
| 2018 | 3 |
| 2019 | 2 |
| 2020 | 1 |
| 2021 | 1 |
| 2022 | 4 |
| 2023 | 3 |
| 2024 | 1 |
| 2025 | 5 |
| 2026 | 2 |
Where
Latest cases
Query with SQL
duckdb -csv -c "WITH phase_names(main, name) AS (VALUES (100, 'Prior to flight'), (150, 'Standing'), (200, 'Pushback/towing'), (250, 'Taxi'), (300, 'Takeoff'), (350, 'Initial climb'), (400, 'Enroute'), (450, 'Maneuvering'), (500, 'Approach'), (550, 'Landing'), (600, 'Emergency descent'), (650, 'Uncontrolled descent'), (700, 'Post-impact'), (750, 'After landing'), (800, 'Other'), (990, 'Unknown')),
crosswalk(code, main, name) AS (VALUES (500, 150, 'Standing'), (501, 150, 'Standing - pre-flight'), (502, 150, 'Standing - starting engine(s)'), (503, 150, 'Standing - engine(s) operating'), (504, 150, 'Standing - engine(s) not operating'), (505, 150, 'Standing - idling rotors'), (510, 250, 'Taxi'), (511, 200, 'Taxi - pushback/tow'), (512, 250, 'Taxi - to takeoff'), (513, 250, 'Taxi - from landing'), (514, 250, 'Taxi - aerial'), (520, 300, 'Takeoff'), (521, 300, 'Takeoff - roll/run'), (522, 350, 'Takeoff - initial climb'), (523, 300, 'Takeoff - aborted'), (530, 400, 'Climb'), (531, 400, 'Climb - to cruise'), (540, 400, 'Cruise'), (541, 400, 'Cruise - normal'), (542, 400, 'Maneuvering - holding (IFR)'), (550, 400, 'Descent'), (551, 400, 'Descent - normal'), (552, 600, 'Descent - emergency'), (553, 650, 'Descent - uncontrolled'), (560, 500, 'Approach'), (561, 500, 'Approach - VFR pattern - downwind'), (562, 500, 'Approach - VFR pattern - base turn'), (563, 500, 'Approach - VFR pattern - base leg/base to final'), (564, 500, 'Approach - VFR pattern - final approach'), (565, 500, 'Go-around (VFR)'), (566, 500, 'Approach - IAF to FAF/outer marker (IFR)'), (567, 500, 'Approach - FAF/outer marker to threshold (IFR)'), (568, 500, 'Circling (IFR)'), (569, 500, 'Missed approach (IFR)'), (570, 550, 'Landing'), (571, 550, 'Landing - flare/touchdown'), (572, 550, 'Landing - roll'), (573, 550, 'Landing - aborted'), (574, 550, 'Emergency landing'), (575, 550, 'Emergency landing after takeoff'), (576, 600, 'Emergency descent/landing'), (580, 450, 'Maneuvering'), (581, 450, 'Maneuvering - aerial application'), (582, 450, 'Maneuvering - turn to reverse direction'), (583, 450, 'Maneuvering - turn to landing area (emergency)'), (590, 450, 'Hover'), (591, 450, 'Hover - in ground effect'), (592, 450, 'Hover - out of ground effect'), (600, 800, 'Other'), (610, 990, 'Unknown')),
current_codes AS (
SELECT e.case_mkey, TRY_CAST(e.\"tier1Number\" AS INTEGER) AS code,
row_number() OVER (PARTITION BY e.case_mkey ORDER BY coalesce(e.\"isDefiningEvent\", false) DESC, e.position) AS n
FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e
WHERE e.aircrafts_position = 1 AND e.\"tier1Number\" GLOB '[1-9][0-9]*'
AND (e.\"isDefiningEvent\" OR e.case_mkey IN (SELECT \"mKey\" FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' WHERE \"isPre1982\"))
),
phases AS (
SELECT case_mkey, 'current' AS scheme, code, CASE WHEN code >= 990 THEN 990 ELSE code // 50 * 50 END AS main
FROM current_codes WHERE n = 1
UNION ALL
SELECT o.case_mkey, 'older', o.\"phaseOfFlightCode\", w.main
FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o JOIN crosswalk w ON w.code = o.\"phaseOfFlightCode\"
WHERE o.aircrafts_position = 1 AND o.\"occurrenceNumber\" = 1 AND o.case_mkey NOT IN (SELECT case_mkey FROM current_codes)
),
case_phases AS (
SELECT p.*, c.\"eventDate\", c.\"highestInjuryLevel\" = 'Fatal' AS fatal, a.aircraft_model_code
FROM phases p JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c.\"mKey\" = p.case_mkey
LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = p.case_mkey AND a.position = 1
WHERE c.\"eventDate\" >= DATE '1962-01-01' AND p.main IN (SELECT main FROM phase_names)
)
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\" = 'WY' AND c.\"eventCountry\" = 'USA'
AND c.\"mKey\" IN (SELECT case_mkey FROM case_phases WHERE main = 400)
ORDER BY c.\"eventDate\" DESC, c.\"ntsbNumber\" DESC"Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.
WITH phase_names(main, name) AS (VALUES (100, 'Prior to flight'), (150, 'Standing'), (200, 'Pushback/towing'), (250, 'Taxi'), (300, 'Takeoff'), (350, 'Initial climb'), (400, 'Enroute'), (450, 'Maneuvering'), (500, 'Approach'), (550, 'Landing'), (600, 'Emergency descent'), (650, 'Uncontrolled descent'), (700, 'Post-impact'), (750, 'After landing'), (800, 'Other'), (990, 'Unknown')),
crosswalk(code, main, name) AS (VALUES (500, 150, 'Standing'), (501, 150, 'Standing - pre-flight'), (502, 150, 'Standing - starting engine(s)'), (503, 150, 'Standing - engine(s) operating'), (504, 150, 'Standing - engine(s) not operating'), (505, 150, 'Standing - idling rotors'), (510, 250, 'Taxi'), (511, 200, 'Taxi - pushback/tow'), (512, 250, 'Taxi - to takeoff'), (513, 250, 'Taxi - from landing'), (514, 250, 'Taxi - aerial'), (520, 300, 'Takeoff'), (521, 300, 'Takeoff - roll/run'), (522, 350, 'Takeoff - initial climb'), (523, 300, 'Takeoff - aborted'), (530, 400, 'Climb'), (531, 400, 'Climb - to cruise'), (540, 400, 'Cruise'), (541, 400, 'Cruise - normal'), (542, 400, 'Maneuvering - holding (IFR)'), (550, 400, 'Descent'), (551, 400, 'Descent - normal'), (552, 600, 'Descent - emergency'), (553, 650, 'Descent - uncontrolled'), (560, 500, 'Approach'), (561, 500, 'Approach - VFR pattern - downwind'), (562, 500, 'Approach - VFR pattern - base turn'), (563, 500, 'Approach - VFR pattern - base leg/base to final'), (564, 500, 'Approach - VFR pattern - final approach'), (565, 500, 'Go-around (VFR)'), (566, 500, 'Approach - IAF to FAF/outer marker (IFR)'), (567, 500, 'Approach - FAF/outer marker to threshold (IFR)'), (568, 500, 'Circling (IFR)'), (569, 500, 'Missed approach (IFR)'), (570, 550, 'Landing'), (571, 550, 'Landing - flare/touchdown'), (572, 550, 'Landing - roll'), (573, 550, 'Landing - aborted'), (574, 550, 'Emergency landing'), (575, 550, 'Emergency landing after takeoff'), (576, 600, 'Emergency descent/landing'), (580, 450, 'Maneuvering'), (581, 450, 'Maneuvering - aerial application'), (582, 450, 'Maneuvering - turn to reverse direction'), (583, 450, 'Maneuvering - turn to landing area (emergency)'), (590, 450, 'Hover'), (591, 450, 'Hover - in ground effect'), (592, 450, 'Hover - out of ground effect'), (600, 800, 'Other'), (610, 990, 'Unknown')),
current_codes AS (
SELECT e.case_mkey, TRY_CAST(e."tier1Number" AS INTEGER) AS code,
row_number() OVER (PARTITION BY e.case_mkey ORDER BY coalesce(e."isDefiningEvent", false) DESC, e.position) AS n
FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e
WHERE e.aircrafts_position = 1 AND e."tier1Number" GLOB '[1-9][0-9]*'
AND (e."isDefiningEvent" OR e.case_mkey IN (SELECT "mKey" FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' WHERE "isPre1982"))
),
phases AS (
SELECT case_mkey, 'current' AS scheme, code, CASE WHEN code >= 990 THEN 990 ELSE code // 50 * 50 END AS main
FROM current_codes WHERE n = 1
UNION ALL
SELECT o.case_mkey, 'older', o."phaseOfFlightCode", w.main
FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o JOIN crosswalk w ON w.code = o."phaseOfFlightCode"
WHERE o.aircrafts_position = 1 AND o."occurrenceNumber" = 1 AND o.case_mkey NOT IN (SELECT case_mkey FROM current_codes)
),
case_phases AS (
SELECT p.*, c."eventDate", c."highestInjuryLevel" = 'Fatal' AS fatal, a.aircraft_model_code
FROM phases p JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c."mKey" = p.case_mkey
LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = p.case_mkey AND a.position = 1
WHERE c."eventDate" >= DATE '1962-01-01' AND p.main IN (SELECT main FROM phase_names)
)
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" = 'WY' AND c."eventCountry" = 'USA'
AND c."mKey" IN (SELECT case_mkey FROM case_phases WHERE main = 400)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESCRun it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.
NTSB WPR26LA209Accident · No injuriesClass 3 · LimitedPreliminary reportCirrus Design SR22T · Casper, WYOn June 1, 2026, about 1340 mountain daylight time, a Cirrus Design Corp SR22T, N324WY, was substantially damaged when it was involved in an accident near Casper, Wyoming. The pilot was not injured. The airplane was operated as a Title 14 Code of Federal…NTSB WPR26LA083Accident · No injuriesClass 4 · LimitedFinal reportRobinson R44 · Parkman, WYThe pilots’ failure to maintain separation while conducting air work in a common operational area. Contributing to the accident was the pilots’ divided attention associated with the mission activity and unreliable radio communications.NTSB WPR26LA048Accident · Serious injuriesClass 4 · LimitedFinal reportAviat A1 · Evanston, WYThe airplane’s encounter with downdrafts in mountainous terrain, which resulted in a collision with terrain. Contributing to the accident was the pilot’s decision to continue the flight through mountainous terrain in marginal weather conditions.NTSB ANC25LA116Accident · No injuriesClass 4 · LimitedFinal reportSocata TBM 700 · Alpine, WYThe pilot’s inadequate preflight inspection and fuel planning, which resulted in a total loss of engine power due to fuel exhaustion and a subsequent off airport landing.NTSB ANC25FA098Accident · 1 fatalClass 3 · FieldPreliminary reportPiper PA-28-180 · Wolf, WYOn September 1, 2025 about 1612 mountain daylight time, a Piper PA-28-180 airplane, N8307W, was substantially damaged when it was involved in an accident near Wolf, Wyoming. The pilot and one passenger were seriously injured; one passenger was fatally…NTSB DCA25LA276Accident · Serious injuriesClass 3 · LimitedPreliminary reportAirbus A330 · Creston, WYOn July 30, 2025, at 1723 mountain daylight time, Delta Air Lines flight 56, an Airbus A330-941, encountered severe turbulence while in cruise flight at an altitude of 37,000 ft near Creston, Wyoming. After determining that injuries had occurred, the flight…NTSB WPR25FA079Accident · 1 fatalClass 3 · FieldPreliminary reportPiper PA-24-250 · Rock Springs, WYOn January 14, 2025, about 0622 mountain standard time, a Piper PA-24-250, N6502P, was destroyed when it was involved in an accident near Rock Springs, Wyoming. The pilot was fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations…NTSB WPR24FA291Accident · 1 fatalClass 3 · FieldFinal reportAmerican Champion 8GCBC · Meeteetse, WYThe pilot’s decision to continue the flight over rising terrain at a low altitude in a high-elevation, high-density-altitude environment.NTSB WPR23LA283Accident · Minor injuriesClass 3 · LimitedFinal reportBeech C35 · Rock Springs, WYMaintenance personnel’s failure to properly secure the propeller pitch control rod castellated nut hardware, which resulted in an in-flight failure of the pitch control bearing and subsequent loss of engine RPM and thrust.NTSB WPR23FA188Accident · 2 fatalClass 3 · FieldFinal reportCessna T182T · Albany, WYThe pilot’s decision to conduct flight into an area of icing in an airplane that was prohibited from such conditions, which resulted in exceedance of the airplane’s critical angle of attack, an aerodynamic stall/spin, and the pilot’s spatial disorientation…NTSB WPR23FA137Accident · 1 fatalClass 3 · FieldFinal reportCessna 182S · Alcova, WYThe airplane’s encounter with low level wind shear associated with moderate turbulence, which resulted in a loss of airplane control.NTSB WPR23LA016Accident · No injuriesClass 3 · LimitedFinal reportQuickie Q2 · Laramie, WYThe partial loss of engine power due to the seizure of the No. 1 cylinder exhaust valve in the valve guide.NTSB WPR22LA352Accident · No injuriesClass 3 · LimitedFinal reportJacquneaux Glen R CGS Hawk · Lander, WYA reported severe airframe vibration and subsequent forced landing for reasons that could not be determined because the wreckage was not made available for examination.NTSB WPR22LA334Accident · Serious injuriesClass 3 · LimitedFinal reportBuxbaum Mark Edward Long EZ · Medicine Bow, WYA partial loss of engine power due to the fatigue fracture of the No. 4 exhaust valve head.NTSB WPR22LA253Accident · 2 fatalClass 3 · LimitedFinal reportCessna P210N · Buffalo, WYThe pilot’s decision to continue the visual flight rules flight into localized instrument meteorological conditions, which resulted in an encounter with convective turbulence and a subsequent loss of control and in-flight breakup.NTSB WPR21LA108Accident · No injuriesClass 3 · LimitedFinal reportAbbett Gerry Lancair Evolution · Saratoga, WYA windshield failure during cruise flight due to stress concentrations in the bond area as a result of improper assembly of the windshield.NTSB WPR20CA262Accident · Serious injuriesClass 4 · Data collectionFinal reportHead AX8 88 · Jackson, WYThe balloon pilot’s inability to maintain altitude during un-forecasted weather, which resulted in a hard landing.NTSB CEN19FA305Accident · 1 fatalClass 3 · FieldFinal reportChampion 7GCBC · Carpenter, WYThe pilot’s exceedance of the airplane’s critical angle of attack during the initial climb after takeoff, which resulted in an aerodynamic stall and loss of control at an altitude too low for recovery.NTSB WPR19LA088Accident · No injuriesClass 3 · LimitedFinal reportLancair IV · Laramie, WYAn environmental stress cracking failure of the acrylic windshield, which resulted in a rapid decompression during cruise flight.NTSB CEN18LA373Accident · No injuriesClass 4 · LimitedFinal reportCessna T310 · Laramie, WYThe pilot’s failure to properly adjust the fuel/air mixtures, which resulted in a partial loss of engine power to both engines due to fuel starvation and a subsequent forced landing to a field.NTSB CEN18LA225Accident · No injuriesLimited investigationFinal reportRockwell International 112TC · Cheyenne, WYA loss of engine power for reasons that could not be determined because postaccident examination did not reveal any evidence of preimpact mechanical malfunctions or failures that would have precluded normal operation.NTSB GAA18CA330Accident · No injuriesData collectionFinal reportSorensen Danny S BF9 2 · Evanston, WYThe pilot’s failure to fuel the biplane’s main fuel tank before the flight and his inadequate preflight inspection, during which he did not verify the fuel quantity, which resulted in fuel exhaustionNTSB CEN17LA356Accident · No injuriesLimited investigationFinal reportCessna R182 · Worland, WYThe pilot's decision to operate an airplane with unreliable fuel gauges and the worn fuel cap seal that allowed fuel to siphon from the left wing fuel tank, which ultimately resulted in a total loss of engine power due to fuel exhaustion.NTSB CEN15LA407Accident · Serious injuriesLimited investigationFinal reportAlon A2 · Laramie, WYThe pilot’s failure to use carburetor heat in cruise flight while operating in an area conducive to serious carburetor icing, which resulted in a loss of engine power and an off-airport landing. Contributing to the accident was the pilot's decision to…NTSB CEN15FA307Accident · 4 fatalField investigationFinal reportCessna T310R · Cody, WYThe pilot's loss of airplane control following the loss of power in the left engine; the reason for the loss of power could not be determined during postaccident engine examination.NTSB WPR14FA188Accident · 2 fatalField investigationFinal reportMooney M20C · Cody, WYThe non-instrument rated pilots’ decision to continue flight into known instrument meteorological conditions over mountainous terrain, which resulted in controlled flight into terrain.NTSB WPR14LA240Accident · No injuriesLimited investigationFinal reportCessna T207A · Rock Springs, WYMaintenance personnel’s application of insufficient torque to the engine cylinder through bolts during replacement of the No. 1 cylinder, which resulted in the displacement of the No. 2 main bearing, the bearing shifting, and a catastrophic engine failure.NTSB DCA14LA060Accident · Serious injuriesLimited investigationFinal reportBoeing 737 · Kaycee, WYan encounter with severe mountain wave turbulence during cruise flight.NTSB WPR13CA381Accident · Minor injuriesData collectionFinal reportCessna 172E · Meeteetse, WYThe student pilot's inadequate preflight planning and failure to maintain clearance from rising terrain, which resulted in controlled flight into terrain. Contributing to the accident was the pilot's lack of situational awareness.NTSB WPR13FA138Accident · 1 fatalField investigationFinal reportCessna 172M · Saratoga, WYThe pilot’s decision to attempt flight into approaching adverse weather, which led to his low-level flight, encounter with mountain obscuration and moderate turbulence, and his subsequent loss of airplane control. Contributing to the severity of the pilot’s…NTSB WPR13FA053Accident · 1 fatalField investigationFinal reportCessna 182D · Bondurant, WYThe noninstrument-rated pilot’s failure to maintain clearance from terrain while maneuvering around weather.NTSB WPR13IA059Incident · No injuriesIncident investigationFinal reportBell 407 · Riverton, WYThe pilot’s failure to maintain sufficient altitude to clear power lines while maneuvering at low altitude. Contributing to the accident was the pilot’s failure to follow company operating specifications for minimum altitude.NTSB WPR13FA008Accident · 4 fatalField investigationFinal reportPiper PA-32R-301T · Laramie Peak, WYThe noninstrument-rated pilot’s continued visual flight into instrument meteorological conditions, which resulted in his failure to maintain sufficient clearance from rising terrain.NTSB WPR12LA392Accident · No injuriesLimited investigationFinal reportCessna 210 · Kemmerer, WYThe total loss of engine power due to fuel exhaustion. Contributing to the accident was the incorrect installation of the fuel bladder tanks.NTSB WPR12LA341Accident · No injuriesLimited investigationFinal reportFairchild Hiller FH-1100 · Cody, WYThe failure of a tail rotor driveshaft coupling due to fatigue.NTSB WPR12LA309Accident · No injuriesLimited investigationFinal reportBeech A36 · Rock Springs, WYThe total loss of engine power due to fuel starvation because of the incorrectly installed fuel cap. Contributing to the accident was the pilot’s decision to continue the flight using fuel from the left fuel tank after she observed fuel streaming from the…NTSB WPR12LA256Accident · No injuriesLimited investigationFinal reportAyres S2R-G6 · Riverton, WYAn engine overspeed shortly after takeoff for reasons that could not be determined because postaccident examination revealed no mechanical malfunctions or failures that would have precluded normal operation.NTSB WPR12LA161Accident · Minor injuriesLimited investigationFinal reportPiper PA-28-181 · Casper, WYA total loss of engine power during cruise flight due to a failed piston pin plug, which resulted in engine oil contamination and subsequent oil starvation. Contributing to the loss of power was the failure of maintenance personnel to identify contaminants…NTSB WPR11FA381Accident · 2 fatalField investigationFinal reportBeech A36 · Lander, WYThe pilot’s failure to maintain clearance from mountainous terrain.NTSB WPR11CA399Accident · No injuriesData collectionFinal reportRichmond Jim R CCK-1865 · Dubois, WYThe pilot's failure to maintain clearance from a wire during cruise flight.NTSB WPR11CA327Accident · Minor injuriesData collectionFinal reportCessna 150J · Wheatland, WYThe pilot's inadequate fuel consumption calculations, which resulted in a loss of engine power due to fuel exhaustion. Contributing to the accident was the pilot's decision to continue flight with known equipment deficiencies.NTSB WPR11LA233Accident · Serious injuriesLimited investigationFinal reportPalmer RV6A · Cody, WYThe pilot’s failure to maintain sufficient altitude to avoid rising terrain. Contributing to the accident was the pilot’s visual illusion and disorientation due to the flat light conditions.NTSB WPR11FA228Accident · 2 fatalField investigationFinal reportBellanca 17-30A · Rock Springs, WYThe pilot’s decision to continue flight into an area of known adverse weather, which resulted in an accumulation of structural ice that led to a loss of control and in-flight breakup. Also causal was the pilot’s inadequate preflight weather planning.NTSB WPR11FA188Accident · 1 fatalField investigationFinal reportAviat A-1C-180 · Laramie, WYThe pilot’s failure to maintain airplane control and to recover from an aerodynamic stall, which resulted in a spin.NTSB WPR11FA082Accident · 3 fatalField investigationFinal reportAero Commander 114B · Lander, WYThe non-instrument-rated pilot's decision to continue visual flight in instrument or marginal visual meteorological conditions in mountainous terrain, which resulted in controlled flight into terrain. Contributing to the accident was the pilot's lack of…NTSB WPR11LA038Accident · No injuriesLimited investigationFinal reportCessna T210N · Baggs, WYThe failure of a connecting rod cap retaining bolt during cruise flight, which resulted in a loss of engine power.NTSB WPR11FA032Accident · 4 fatalField investigationFinal reportMooney M20J · Lander, WYThe pilot's decision to depart into known adverse weather conditions over mountainous terrain, which required operation near the limits of the airplane's performance capability and which resulted in a loss of airplane control and subsequent ground impact.…NTSB WPR09CA348Accident · Serious injuriesData collectionFinal reportCessna 172M · Thermopolis, WYThe instructor pilot's failure to ensure that his dual student maintained clearance from the terrain during a dark night visual flight rules descent.NTSB WPR09CA193Accident · Minor injuriesData collectionFinal reportPiper PA-28-140 · Dubois, WYThe pilot's encounter with a windshear/downdraft that exceeded the climb performance capabilities of the airplane.NTSB WPR09CA051Accident · No injuriesData collectionFinal reportBeech B60 · Rock River, WYThe pilot's failure to maintain clearance from a power line due to the lack of forward visibility because of an ice-covered windshield. Contributing to the accident was the flight's encounter with icing weather conditions.