# NTSB investigations: Allison 250-C20 series: In flight collision with terrain/water 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 SEA06TA071](https://openairdocs.org/ntsb/SEA06TA071.md): Bell 206B · Sprague, WA · Accident · No injuries · Final report · Apr 7, 2006 · N96NW · Substantial damage > The pilot's failure to maintain clearance from mountainous terrain while maneuvering. Mountainous terrain was a factor. - [NTSB SEA05CA200](https://openairdocs.org/ntsb/SEA05CA200.md): McDonnell Douglas 369E · Medford, OR · Accident · Minor injuries · Data collection · Final report · Sep 24, 2005 · N5207C · Substantial damage > In-flight collision with terrain during a precautionary landing. Factors include instrument meteorological conditions and pilot disorientation. - [NTSB MIA05LA088](https://openairdocs.org/ntsb/MIA05LA088.md): Schweizer 269D · Atlantic Ocean (Atlantic Ocean) · Accident · 1 fatal · Limited investigation · Final report · Mar 29, 2005 · N4767 · Destroyed > An inflight collision with the ocean for undetermined reasons. - [NTSB DFW05TA056](https://openairdocs.org/ntsb/DFW05TA056.md): Schweizer 269D · San Antonio, TX · Accident · Minor injuries · Final report · Jan 18, 2005 · N296RL · Substantial damage > The inadequate supervision and delayed remedial action by the flight instructor, which resulted in an inadvertent dynamic rollover. - [NTSB FTW04TA237](https://openairdocs.org/ntsb/FTW04TA237.md): Bell OH-58C · Beaumont, TX · Accident · 1 fatal · Final report · Sep 16, 2004 · N9273T · Destroyed > **This probable cause was modified on 2/22/2016. Please see the public docket for this accident for additional details.** The pilot's failure to maintain a safe altitude, resulting in collision with the water. A factor was the dark night. - [NTSB CHI04LA017](https://openairdocs.org/ntsb/CHI04LA017.md): Hughes 369HS · Evansville, MN · Accident · Minor injuries · Limited investigation · Final report · Oct 21, 2003 · N49TJ · Substantial damage > The pilot's misjudgment of clearance from the surface of the lake during the aerial application pass. The low altitude operation, glassy water, and his visual perception were contributing factors. - [NTSB FTW02LA143](https://openairdocs.org/ntsb/FTW02LA143.md): Bell 206B · Rosenberg, TX · Accident · Serious injuries · Limited investigation · Final report · May 12, 2002 · N717NH · Substantial damage > The pilot's failure to maintain terrain clearance. - [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 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 CHI00FA020](https://openairdocs.org/ntsb/CHI00FA020.md): Bell 206B · Cottage Grove, MN · Accident · 2 fatal · Field investigation · Final report · Nov 1, 1999 · N565KS · Destroyed > Undetermined. - [NTSB LAX99LA292](https://openairdocs.org/ntsb/LAX99LA292.md): Hughes 369HS · Pohnpei (Pacific Ocean) · Accident · 2 fatal · Limited investigation · Final report · Sep 1, 1999 · N42054 · Destroyed > An in-flight collision with the water for undetermined reasons. - [NTSB NYC99LA147](https://openairdocs.org/ntsb/NYC99LA147.md): Bell 206B-III · Tinicum, PA · Accident · Minor injuries · Limited investigation · Final report · Jun 17, 1999 · N94WF · Substantial damage > The pilot's failure to maintain a proper altitude above the water. - [NTSB CHI97LA008](https://openairdocs.org/ntsb/CHI97LA008.md): Hughes 369E · Hesston, KS · Accident · No injuries · Limited investigation · Final report · Oct 15, 1996 · N504AP · Substantial damage > the pilot selected unsuitable terrain for landing. The factors involved were: an inoperative landing light, dusk light conditions, and the terrain condition. - [NTSB LAX95FA339](https://openairdocs.org/ntsb/LAX95FA339.md): Bell 206L-1 · Irvine, CA · Accident · 1 fatal · Field investigation · Final report · Sep 20, 1995 · N700TH · Destroyed > the pilot's intentional VFR flight into IMC conditions and failure to maintain an adequate terrain clearance altitude, and the local controller's improper use of ATC procedure/technique. Factors in the accident were the helicopter's low fuel state and lack of… - [NTSB LAX93LA249](https://openairdocs.org/ntsb/LAX93LA249.md): Hughes 369D · Kahului, HI · Accident · No injuries · Limited investigation · Final report · Jun 11, 1993 · N1113L · Substantial damage > The failure of the pilot to maintain adequate ground obstruction clearance while engaged in a cattle herding operation. - [NTSB LAX87LA310](https://openairdocs.org/ntsb/LAX87LA310.md): Bell 206B · Kailua-Kona, HI · Accident · Minor injuries · Limited investigation · Final report · Aug 23, 1987 · N2777R · Substantial damage > As the helicopter was climbing over rising terrain at 300' to 400' AGL, the plt noted altimeter & airspeed indcns of 8700' & 60 mph. After climbing an adnl 2 min to aprx 10,000' (12,000' density alt), he noticed the rotor RPM was bleeding off. He made a 180… - [NTSB ANC82DA062](https://openairdocs.org/ntsb/ANC82DA062.md): Hughes 369D · Near Bornite, AK · Accident · 1 fatal · Final report · Jul 28, 1982 · N820Y · Destroyed > Two workers were transported to a mine drilling site where the helicopter was landed on a man-made heli-pad. The heli-pad was an area about 50 ft long and 12 ft wide that had been cut into the side of a rocky hill. After off-loading the workers, the pilot… ## 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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03020') AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 230)) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=03020&occurrence=230 --- 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.