# NTSB investigations: Allison 250-C20 series, 2001 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 DEN02GA016](https://openairdocs.org/ntsb/DEN02GA016.md): Hughes 369E · Park City, UT · Accident · 3 fatal · Final report · Dec 27, 2001 · N280SP · Destroyed > the pilot's inadequate visual lookout, resulting in an inflight collision with powerlines. Contributing factors were the fog and the powerlines. - [NTSB ATL02TA021](https://openairdocs.org/ntsb/ATL02TA021.md): Bell 206 · Awendaw, SC · Accident · No injuries · Final report · Dec 21, 2001 · N206HE · Substantial damage > The pilot's failure to maintain clearance from the bambi bucket suspension assembly during dip operation. - [NTSB DEN02LA013](https://openairdocs.org/ntsb/DEN02LA013.md): Bell 206B · Bryce, UT · Accident · Serious injuries · Limited investigation · Final report · Dec 1, 2001 · N911KH · Substantial damage > loss of engine power for reasons undetermined. Contributing factors were the low airspeed and altitude at which to perform an autorotation. - [NTSB SEA02FA008](https://openairdocs.org/ntsb/SEA02FA008.md): Bell 206L · Anchorage, AK · Accident · 3 fatal · Field investigation · Final report · Oct 18, 2001 · N400EH · Substantial damage > The pilot's failure to maintain clearance from the surface of an open body of water while intentionally attempting to maintain a very low altitude while in cruise flight. Factors include falling snow, low ceilings, whiteout/greyout conditions, and flat/glassy… - [NTSB LAX01FA306](https://openairdocs.org/ntsb/LAX01FA306.md): Bell 206B · Hilo, HI · Accident · Minor injuries · Field investigation · Final report · Sep 30, 2001 · N206KS · Destroyed > The failure of the mechanic to secure the No. 8 bearing thrust nut during maintenance work, which resulted in the total failure of the first stage turbine wheel shaft. Also causal was his misjudgment of his height during the flare resulting in a hard landing.… - [NTSB CHI01LA327](https://openairdocs.org/ntsb/CHI01LA327.md): Bell 206B-III · Park Rapids, MN · Accident · Minor injuries · Limited investigation · Final report · Sep 27, 2001 · N56MC · Substantial damage > The pilot not maintaining altitude/clearance when he maneuvered above the glassy lake. A factor to the accident was the glassy lake condition. - [NTSB LAX01LA305](https://openairdocs.org/ntsb/LAX01LA305.md): Hughes 369D · Carlsbad, CA · Accident · No injuries · Limited investigation · Final report · Sep 23, 2001 · N268ST · Substantial damage > A hard landing due to the dual student's failure to maintain main rotor speed, his improper landing flare, and the flight control interference by the flight instructor. - [NTSB MIA01TA194](https://openairdocs.org/ntsb/MIA01TA194.md): Bell 206B-III · Jacksonville, FL · Accident · Minor injuries · Final report · Jul 25, 2001 · N313JP · Destroyed > the pilot's failure to recognize and correct for unanticipated right yaw/loss of tail rotor effectiveness (LTE) during an approach to hover at a low altitude, which resulted in a loss of control and the helicopter descending and colliding with a house and the… - [NTSB LAX01IA262](https://openairdocs.org/ntsb/LAX01IA262.md): Mdhi 520N · Los Angeles, CA · Incident · No injuries · Incident investigation · Final report · Jul 25, 2001 · N953SD · Minor damage > the excitation of the first bending mode natural frequency of the aft tube assembly that is installed through the rotating NOTAR fan drive system. Contributing factors to the incident included the operator's maintenance practice of hand-sanding the pitch… - [NTSB NYC01LA179](https://openairdocs.org/ntsb/NYC01LA179.md): McDonnell Douglas 369E · Niagara Falls, NY · Accident · No injuries · Limited investigation · Final report · Jul 19, 2001 · N577DB · Substantial damage > The right skid getting snagged on the helicopter-dolly resulting in dynamic rollover. - [NTSB SEA01LA082](https://openairdocs.org/ntsb/SEA01LA082.md): Schweizer 269D · Nampa, ID · Accident · No injuries · Limited investigation · Final report · May 3, 2001 · N2061D · Substantial damage > the pilot's inadequate compensation for strong, gusty, shifting winds while hovering in ground effect. Factors include a sudden directional change and increase in velocity of the gusty wind conditions. - [NTSB IAD01TA051](https://openairdocs.org/ntsb/IAD01TA051.md): Hughes 369D · Taylorsville, KY · Accident · Minor injuries · Final report · Apr 29, 2001 · N50AP · Substantial damage > the flight instructor's inadequate aircraft control during a practice autorotation which resulted in a hard landing. - [NTSB CHI01LA119](https://openairdocs.org/ntsb/CHI01LA119.md): Hughes 369D · Du Quoin, IL · Accident · Minor injuries · Limited investigation · Final report · Apr 18, 2001 · N713HT · Destroyed > loss of engine power for undetermined reasons, the pilot operating the helicopter outside of the height-velocity curve, and the pilot's failure to maintain control of the helicopter during the emergency landing. Factors relating to the accident were the… ## 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") = 2001 AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03020')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=03020&year=2001 --- 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.