# NTSB investigations: Allison 250-C20 series, 1999 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 LAX00LA047](https://openairdocs.org/ntsb/LAX00LA047.md): Boeing 369E · Taft, CA · Accident · No injuries · Limited investigation · Final report · Nov 30, 1999 · N5238C · Substantial damage > The fatigue failure of a second stage compressor vane due to erosion, which resulted in a catastrophic engine failure. An inadequate inspection of the compressor section by company maintenance personnel during the last 300-hour inspection was also causal in… - [NTSB SEA00FA021](https://openairdocs.org/ntsb/SEA00FA021.md): Bell 206L-3 · Seattle, WA · Accident · Minor injuries · Field investigation · Final report · Nov 17, 1999 · N206AC · 2 aircraft · Substantial damage > Adequate separation and lookout not maintained by the pilots of both aircraft. - [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 LAX00GA025](https://openairdocs.org/ntsb/LAX00GA025.md): McDonnell Douglas 500N · San Jose, CA · Accident · 2 fatal · Final report · Oct 25, 1999 · N904PD · Destroyed > The pilot's in-flight loss of control due to the failure and separation of the forward thruster control cable telescoping sleeve ball swivel fitting, which resulted in a stuck thruster and the entry into an uncontrollable yaw/spin. Also causal was the… - [NTSB LAX00LA016](https://openairdocs.org/ntsb/LAX00LA016.md): Bell 206-B3 · Soda Springs, CA · Accident · Minor injuries · Limited investigation · Final report · Oct 18, 1999 · N2296N · Substantial damage > The failure of the pilot-in-command to maintain landing skid clearance during hover taxi, which resulted in a dynamic rollover. - [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 LAX99LA237](https://openairdocs.org/ntsb/LAX99LA237.md): Hiller UH-12ET · Williams, CA · Accident · No injuries · Limited investigation · Final report · Jun 30, 1999 · N7173F · Substantial damage > The pilot's inadequate preflight planning and verification that fuel was available for the intended flight. A factor was the fuel quantity false indication. - [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 LAX99LA253](https://openairdocs.org/ntsb/LAX99LA253.md): Hughes 369HS · Pacific Ocean (Pacific Ocean) · Accident · Minor injuries · Limited investigation · Final report · Jun 7, 1999 · N4278M · Destroyed > The removal of the tail rotor blade abrasion strips by the use of an unapproved method by the maintenance personnel which resulted in the imbalance of the tail rotor blade assembly and subsequent separation of the 90-degree gear box; the pilot/mechanic's… - [NTSB MIA99FA158](https://openairdocs.org/ntsb/MIA99FA158.md): Hughes 369E · Intercession, FL · Accident · 1 fatal · Field investigation · Final report · May 20, 1999 · N144CM · Substantial damage > The pilot's improper fuel management that resulted in fuel exhaustion and a total loss of engine power. - [NTSB LAX99FA136](https://openairdocs.org/ntsb/LAX99FA136.md): Bell 206B · Grand Canyon, AZ · Accident · 1 fatal · Field investigation · Final report · Apr 1, 1999 · N992UC · Destroyed > The failure of the flight crew to properly preflight the helicopter and to detect and remove accumulated snow from the engine inlets and plenum chamber. Factors in the accident were the clouded plenum chamber inspection window and the failure of preceding… - [NTSB MIA99LA111](https://openairdocs.org/ntsb/MIA99LA111.md): Fairchild Hiller FH-1100 · Zephyrhills, FL · Accident · No injuries · Limited investigation · Final report · Mar 24, 1999 · N4412C · Substantial damage > The student pilot's improper use of flight controls (cyclic and collective) during a takeoff to a hover. This resulted in the helicopter encountering dynamic rollover and rolling over on its right side. - [NTSB LAX99LA116](https://openairdocs.org/ntsb/LAX99LA116.md): Bell 206B · Delhi, CA · Accident · Minor injuries · Limited investigation · Final report · Mar 10, 1999 · N901CA · Substantial damage > The pilot's failure to maintain clearance while landing in proximity to high vegetation, which resulted in the inadvertent contact of the spray boom to the trees. - [NTSB SEA99FA037](https://openairdocs.org/ntsb/SEA99FA037.md): Hiller UH-12E · Yellow Pine, ID · Accident · No injuries · Field investigation · Final report · Feb 28, 1999 · N2239 · Substantial damage > Altitude deviation during aerial taxi for undetermined reasons. - [NTSB FTW99LA076](https://openairdocs.org/ntsb/FTW99LA076.md): Bell 206-B3 · Sabine Pass, TX · Accident · Minor injuries · Limited investigation · Final report · Feb 6, 1999 · N907CA · Substantial damage > The pilot's inadvertent flight into instrument meteorological conditions and subsequent spatial disorientation. Factors were the dark night conditions, the fog, and the pilot's failure to obtain a weather briefing prior to the flight. - [NTSB DEN99TA031](https://openairdocs.org/ntsb/DEN99TA031.md): Hughes 369D · Woodruff, UT · Accident · No injuries · Final report · Jan 4, 1999 · N5013P · Substantial damage > A partial loss of engine power due to erosion in the compressor assembly module. Factors were a missing rotating labyrinth seal, the installation of which had not been performed by unknown maintenance personnel. ## 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") = 1999 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=1999 --- 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.