# NTSB investigations: Lycoming HIO-360 series, CO 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 CEN25LA003](https://openairdocs.org/ntsb/CEN25LA003.md): Schweizer 269C · Montrose, CO · Accident · Minor injuries · Class 3 · Limited · Final report · Oct 3, 2024 · N656RB · Substantial damage > A loss of engine power during a demonstrated autorotation due to an improperly adjusted air-fuel mixture or idle setting. Contributing to the accident was the pilot’s failure to perform the required idle check during previous flights in higher elevation areas. - [NTSB CEN12LA343](https://openairdocs.org/ntsb/CEN12LA343.md): Schweizer 269C · Denver, CO · Accident · No injuries · Limited investigation · Final report · Jun 2, 2012 · N2196F · Substantial damage > The inadequately overhauled landing gear dampers that allowed initiation of a ground resonance event from which the pilot was unable to recover. Contributing to the accident was the overhaul facility's failure to identify the overcharged dampers and a lack of… - [NTSB DEN05FA080](https://openairdocs.org/ntsb/DEN05FA080.md): Schweizer 269C · Pueblo, CO · Accident · Serious injuries · Field investigation · Final report · Jun 15, 2005 · N311CP · Destroyed > the flight instructor's failure to maintain control of the helicopter during the attempted autorotation after the loss of engine power for reasons undetermined. Contributing factors include the flight instructor's improper preflight planning, the high density… - [NTSB DEN05CA079](https://openairdocs.org/ntsb/DEN05CA079.md): Schweizer 269C · Pueblo, CO · Accident · No injuries · Data collection · Final report · May 19, 2005 · N958CP · Substantial damage > the student pilot's failure to maintain control of the helicopter during the landing. Contributing to the accident was the flight instructor's inadequate supervision of the student pilot. - [NTSB DEN05LA068](https://openairdocs.org/ntsb/DEN05LA068.md): Enstrom F-28C · Morrison, CO · Accident · No injuries · Limited investigation · Final report · Apr 13, 2005 · N5690K · Substantial damage > the pilot's failure to maintain rotor RPM during the approach which resulted in a landing short of the helipad. - [NTSB DEN04CA092](https://openairdocs.org/ntsb/DEN04CA092.md): Schweizer 269C · Englewood, CO · Accident · No injuries · Data collection · Final report · Jun 13, 2004 · N2062N · Substantial damage > the settling with power situation encountered by the pilot. Contributing to the accident was the high density altitude. - [NTSB DEN03FA090](https://openairdocs.org/ntsb/DEN03FA090.md): Hughes 269C · Watkins, CO · Accident · 1 fatal · Field investigation · Final report · May 28, 2003 · N9643F · Destroyed > failure of both pilots to initiate a timely recovery from a practice autorotation. A contributing factor was the instructor's inadequate supervision of the pilot receiving instruction. - [NTSB DEN03LA018](https://openairdocs.org/ntsb/DEN03LA018.md): Enstrom F-28C · Morrison, CO · Accident · Minor injuries · Limited investigation · Final report · Nov 23, 2002 · N552CS · Substantial damage > the pilot not maintaining clearance from the telephone lines during landing. Factors contributing to the accident were the pilot not being able to see the telephone lines, the low altitude, and the dark night. - [NTSB DEN02LA098](https://openairdocs.org/ntsb/DEN02LA098.md): Schweizer 269C · Broomfield, CO · Accident · No injuries · Limited investigation · Final report · Aug 20, 2002 · N7508L · Substantial damage > maintenance personnel's failure to secure the landing skid oleo strut bolt during the last 50-hour inspection, causing the left rear skid to collapse and the tail rotor to strike the ground. - [NTSB FTW02LA104](https://openairdocs.org/ntsb/FTW02LA104.md): Hughes 269A-1 · Fort Collins, CO · Accident · No injuries · Limited investigation · Final report · Mar 27, 2002 · N8942F · Substantial damage > the flight instructor's failure to maintain control of the helicopter while hovering. Contributing factors were the tailwind and gusty wind conditions. - [NTSB DEN00LA083](https://openairdocs.org/ntsb/DEN00LA083.md): Hughes 269C · Loveland, CO · Accident · No injuries · Limited investigation · Final report · May 3, 2000 · N1098B · Substantial damage > The pilot misjudged the run on landing during a full autorotation. Factors were a total loss of power for unknown reasons and soft terrain. - [NTSB FTW98LA129](https://openairdocs.org/ntsb/FTW98LA129.md): Enstrom F-28C-2 · Broomfield, CO · Accident · No injuries · Limited investigation · Final report · Feb 15, 1998 · N5693M · Substantial damage > water contamination in the fuel, which resulted in loss of engine power and a forced (autorotative) landing. Factors relating to the accident were: darkness; and a high obstruction in the emergency landing area. - [NTSB DEN93LA070](https://openairdocs.org/ntsb/DEN93LA070.md): Enstrom F-28C · Boulder, CO · Accident · No injuries · Limited investigation · Final report · Jun 27, 1993 · N625H · Substantial damage > A failure by the pilot flying to adequately compensate for wind conditions which led to a loss of tail rotor control. A factor was: inadequate supervision by the pilot in command. - [NTSB DEN92LA001](https://openairdocs.org/ntsb/DEN92LA001.md): Enstrom F-28C · Evergreen, CO · Accident · No injuries · Limited investigation · Final report · Oct 2, 1991 · N552H · Substantial damage > In flight encounter with a sudden downdraft. A factor was: the pilot's lack of total experience in aircraft type. ## 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" = 'CO' 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 ('41524')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=41524&state=CO --- 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.