# NTSB investigations, 1990, WY 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 ANC91FA017](https://openairdocs.org/ntsb/ANC91FA017.md): Piper PA-31-350 · Evanston, WY · Accident · 1 fatal · Field investigation · Final report · Dec 18, 1990 · N4082H · Destroyed > The pilot's premature descent. Contributing to the accident was the pilot's fatigue and poor weather. - [NTSB SEA91LA012](https://openairdocs.org/ntsb/SEA91LA012.md): Christen Industries A-1 · Afton, WY · Accident · No injuries · Limited investigation · Final report · Nov 4, 1990 · N9609G · Substantial damage > An improper maintenance modification to disable the carburetor heat control by unknown personnel. - [NTSB SEA91LA009](https://openairdocs.org/ntsb/SEA91LA009.md): Cessna T210N · Laramie, WY · Accident · No injuries · Limited investigation · Final report · Oct 28, 1990 · N4981C · Substantial damage > The pilot did not properly set the mixture control. - [NTSB SEA91LA007](https://openairdocs.org/ntsb/SEA91LA007.md): Cessna 414A · Jackson, WY · Accident · No injuries · Limited investigation · Final report · Oct 17, 1990 · N26853 · Destroyed > The pilot's inadequate preflight preparation of the aircraft, his failure to remove snow and ice from the aircraft before takeoff, and his delay in attempting to abort the takeoff. - [NTSB SEA91LA006](https://openairdocs.org/ntsb/SEA91LA006.md): Mooney M20F · Casper, WY · Accident · No injuries · Limited investigation · Final report · Oct 13, 1990 · N9732M · Substantial damage > The loss of engine power due to fatigue fracture of the number 2 cylinder connecting rod. Factors related to the accident were: rough and uneven terrain at the accident site and the lack of suitable terrain for forced landing. - [NTSB SEA90LA188](https://openairdocs.org/ntsb/SEA90LA188.md): Piper PA34-200T · Jackson, WY · Accident · No injuries · Limited investigation · Final report · Sep 13, 1990 · N3981F · Substantial damage > The pilot misjudged the landing flare and landed hard. - [NTSB SEA90LA178](https://openairdocs.org/ntsb/SEA90LA178.md): Cessna 170A · Elk Mountain, WY · Accident · Serious injuries · Limited investigation · Final report · Sep 10, 1990 · N9157A · Substantial damage > The pilot's failure to maintain flying speed while at an altitude that did not provide adequate terrain clearance for a safe stall recovery. - [NTSB SEA90LA174](https://openairdocs.org/ntsb/SEA90LA174.md): Piper PA-32-300RT · Glenrock, WY · Accident · No injuries · Limited investigation · Final report · Sep 6, 1990 · N21434 · Substantial damage > Fuel exhaustion resulting from the pilot's inadequate preflight planning/preparation. Unsuitable terrain was a factor related to the accident. - [NTSB SEA90LA175](https://openairdocs.org/ntsb/SEA90LA175.md): Mooney M-20E · Cheyenne, WY · Accident · No injuries · Limited investigation · Final report · Sep 5, 1990 · N9067V · Substantial damage > Pilot's failure to extend the landing gear prior to landing after having been distracted by traffic. A mitigating factor in this accident was the fact that the gear warning horn did not function. - [NTSB DEN90FA172](https://openairdocs.org/ntsb/DEN90FA172.md): Aerospatiale SA316B · Meeteetse, WY · Accident · Serious injuries · Field investigation · Final report · Aug 20, 1990 · N83776 · Destroyed > A main rotor head blade dampener failure. A factor in the accident was the subsequent failure of a blade restraining cable. - [NTSB SEA90LA152](https://openairdocs.org/ntsb/SEA90LA152.md): Boson Starduster TOO · Pinedale, WY · Accident · No injuries · Limited investigation · Final report · Aug 1, 1990 · N18YB · Substantial damage > The loss of engine power due to failure of the ignition coil, and the lack of suitable terrain for a forced landing. Failure of the ignition coil resulting in a total loss of engine power. The lack of suitable terrain was a factor related to the accident. - [NTSB DEN90LA168](https://openairdocs.org/ntsb/DEN90LA168.md): Gulfstream G-II · Cheyenne, WY · Accident · Serious injuries · Limited investigation · Final report · Jul 28, 1990 · N405MM · No damage > An unforeseen encounter with clear air turbulence. - [NTSB SEA90LA147](https://openairdocs.org/ntsb/SEA90LA147.md): Lake LA-250 · Rawlins, WY · Accident · Minor injuries · Limited investigation · Final report · Jul 27, 1990 · N14004 · Substantial damage > Pilot's improper planning/decision, and his misjudgement of the aircraft's climb capability in conditions of high density altitude and unanticipated atmospheric conditions. The high density altitude and rising terrain were related factors. - [NTSB SEA90FA146](https://openairdocs.org/ntsb/SEA90FA146.md): Wheeler Technology FT-210 · Linch, WY · Accident · 3 fatal · Field investigation · Final report · Jul 25, 1990 · N210EX · Destroyed > Failure of the pilot to maintain control of the aircraft and/or correct the stall/spin. - [NTSB DEN90LA164](https://openairdocs.org/ntsb/DEN90LA164.md): Mooney M20F · Torrington, WY · Accident · No injuries · Limited investigation · Final report · Jul 14, 1990 · N6456Q · Substantial damage > A partial loss of power due to a failed exhaust valve. A factor was the lack of suitable terrain for the forced landing. - [NTSB DEN90LA141](https://openairdocs.org/ntsb/DEN90LA141.md): Beech 23 · Wheatland, WY · Accident · No injuries · Limited investigation · Final report · Jun 24, 1990 · N2310J · Substantial damage > Permature liftoff. - [NTSB DEN90LA123](https://openairdocs.org/ntsb/DEN90LA123.md): Piper PA-18-150 · Douglas, WY · Accident · No injuries · Limited investigation · Final report · Jun 4, 1990 · N4720A · Substantial damage > The accident to be improper installation of aileron control system by maintenance personnel, and failure to perform an aircraft preflight by the pilot in command. - [NTSB DEN90IA072](https://openairdocs.org/ntsb/DEN90IA072.md): Cessna 208A · Wright, WY · Incident · No injuries · Incident investigation · Final report · Mar 6, 1990 · N812FE · No damage > The incident was engine failure due to gas producer turbine disc blade failure caused by stress rupture. ## 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 year(c."eventDate") = 1990 AND c."eventStateOrRegion" = 'WY' AND c."eventCountry" = 'USA' ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?state=WY&year=1990 --- 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.