# NTSB investigations: Allison 250 SER 250HP: Airframe/component/system failure/malfunction 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 MIA06LA123](https://openairdocs.org/ntsb/MIA06LA123.md): Bell 206B · Pompano Beach, FL · Accident · Minor injuries · Limited investigation · Final report · Jul 17, 2006 · N515AA · Substantial damage > The pilot's improper landing flare during a precautionary landing. A factor in the accident was the unusual noise as a result of an improper repaired air conditioner compressor system. - [NTSB CHI00FA266](https://openairdocs.org/ntsb/CHI00FA266.md): Fairchild Hiller FH-1100 · Valparaiso, IN · Accident · 1 fatal · Field investigation · Final report · Aug 19, 2000 · N250AD · Destroyed > The in-flight fracture of the main rotor mast and the separation of the main rotor. Factors to the accident were the corroded main rotor mast that resulted in fatigue. - [NTSB IAD00LA002](https://openairdocs.org/ntsb/IAD00LA002.md): Loral GZ-22 · Mogadore, OH · Accident · Minor injuries · Limited investigation · Final report · Oct 28, 1999 · N4A · Substantial damage > The failure of the flight control system manufacturer to meet design (hardness) specifications that resulted in stripped splines. - [NTSB FTW98LA260](https://openairdocs.org/ntsb/FTW98LA260.md): Bell 206B · Corpus Christi, TX · Accident · No injuries · Limited investigation · Final report · Jun 7, 1998 · N16814 · Substantial damage > The failure of the tail rotor drive shaft due to the separation of a bolt at one of the drive shaft disc couplings for an undetermined reason, which resulted in the pilot's inability to maintain directional control during landing. - [NTSB FTW97LA326](https://openairdocs.org/ntsb/FTW97LA326.md): Bell 206B · Oak Grove, LA · Accident · No injuries · Limited investigation · Final report · Aug 23, 1997 · N7929J · Substantial damage > The disconnect of the #5 tail rotor drive segment due to the debonding of the joint between the shaft tube and the flange fitting. Factors were the improper bead blasting of the tail rotor drive segment by an unknown maintenance personnel, and the lack of… - [NTSB LAX94LA387](https://openairdocs.org/ntsb/LAX94LA387.md): Hughes 369D · Pacific Ocean (Pacific Ocean) · Accident · Serious injuries · Limited investigation · Final report · Sep 24, 1994 · N58400 · Destroyed > failure of the helicopter's main rotor pitch change link (control rod). The helicopter was not recovered and the Safety Board was unable to determine the pitch change link's failure mode. - [NTSB LAX93LA104](https://openairdocs.org/ntsb/LAX93LA104.md): Fairchild Hiller FH-1100 · Volcano Natl Pk, HI · Accident · 4 fatal · Limited investigation · Final report · Jan 25, 1993 · N427FH · Destroyed > A loss of tail rotor control for an undetermined reason(s). A factor which contributed to the accident was the pilot's choice of a hover altitude/position inadequate to reach a shoreline in the event of an emergency. A factor which contributed to the severity… - [NTSB CHI92LA017](https://openairdocs.org/ntsb/CHI92LA017.md): Mcdonnell Douglas MD369D · Beech Grove, IN · Accident · No injuries · Limited investigation · Final report · Oct 23, 1991 · N88SE · Substantial damage > Improper installation of the flight control linkage during maintenance. Complacency and inadequate inspection of the helicopter by maintenance personnel and the pilot are factors in the accident. - [NTSB FTW91LA023](https://openairdocs.org/ntsb/FTW91LA023.md): Bell 206L-1 · W.Cameron 266 · Accident · No injuries · Limited investigation · Final report · Dec 9, 1990 · N5753B · Destroyed > Failure of the helicopter's aft landing gear crosstube assembly due to fatigue. - [NTSB LAX87LA199](https://openairdocs.org/ntsb/LAX87LA199.md): Hughes 369D · Tamunings · Accident · 2 fatal · Limited investigation · Final report · Apr 29, 1987 · N10995 · Destroyed > A Hughes 369D, operated off of a fishing vessel, went out of control and crashed in the pacific ocean, nr guam. The accident was witnessed by the ship's captain. His statement indicated one of the main rotor blades separated in flt while the helo was orbiting… - [NTSB SEA85LA017](https://openairdocs.org/ntsb/SEA85LA017.md): Hughes 369D · Humptulips, WA · Accident · Minor injuries · Limited investigation · Final report · Nov 13, 1984 · N1096L · Destroyed > When the hoisting cable on the helicopter failed, the hook end rebounded into the rotor system. The rotor system failed from the structural damage imposed and the acft went into an uncontroled descent impacting the ground on the left skid. - [NTSB FTW82FRJ17](https://openairdocs.org/ntsb/FTW82FRJ17.md): Bell 206B · Jamestown, LA · Accident · Serious injuries · Final report · Aug 27, 1982 · N5754P · Destroyed > The pilot was conducting aerial burning operations over a wooded area when he heard a loud bang from the engine area of the helicopter. At that time, the helicopter was approximately 20 ft above the tallest tree in the area with the aerial torch burning. 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 c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03002', '03003') 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" = 130)) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=03002&occurrence=130 --- 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.