# NTSB investigations: Allison 250 SER 400HP: 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 LAX06IA011](https://openairdocs.org/ntsb/LAX06IA011.md): Hughes 369D · Kahului, HI · Incident · No injuries · Incident investigation · Final report · Oct 14, 2005 · N58267 · Minor damage > The fatigue cracking and failure of the tail rotor control rod during cruise flight, which resulted in a hard landing during the precautionary landing. - [NTSB DEN05TA119](https://openairdocs.org/ntsb/DEN05TA119.md): Hughes 369HS · Albuquerque, NM · Accident · Serious injuries · Final report · Aug 6, 2005 · N500SD · Substantial damage > the bullet(s), which severed the helicopter's left tail rotor pedal. Contributing factors were the severed anti-torque pedal and the unsuitable terrain for landing. - [NTSB DEN01LA012](https://openairdocs.org/ntsb/DEN01LA012.md): Bell 206L-1 · Mesa Verde, CO · Accident · No injuries · Limited investigation · Final report · Oct 30, 2000 · N613 · Substantial damage > The manufacturer's use of improper materials, and inadequate quality control of the tail rotor blades during the manufacturing process, which resulted in fatigue failure of the blade. - [NTSB LAX00LA103](https://openairdocs.org/ntsb/LAX00LA103.md): Hughes 369HS · Pacific Ocean (Pacific Ocean) · Accident · No injuries · Limited investigation · Final report · Feb 14, 2000 · N717ST · Destroyed > An unknown mechanical malfunction that resulted in a precautionary landing at sea and the subsequent sinking of the helicopter by an ocean swell. - [NTSB ANC98TA125](https://openairdocs.org/ntsb/ANC98TA125.md): Bell 206B II · Chickaloon, AK · Accident · No injuries · Final report · Aug 15, 1998 · N70711 · Substantial damage > A fracture of the main rotor drag pin assembly. - [NTSB SEA96LA025](https://openairdocs.org/ntsb/SEA96LA025.md): Hughes 369D · Scotts Mills, OR · Accident · Minor injuries · Limited investigation · Final report · Nov 29, 1995 · N64DB · Substantial damage > The pilot's failure to maintain adequate clearance from the ground. - [NTSB ANC92FA159](https://openairdocs.org/ntsb/ANC92FA159.md): Hughes 369D · Nunavaugaluk Lk, AK · Accident · Serious injuries · Field investigation · Final report · Sep 9, 1992 · N8697F · Substantial damage > The separation of the tail rotor abrasion strip and the subsequent total loss of the tail rotor. Factors contributing to the accident were: insufficient manufacturer's maintenance design changes, inadequate aircraft equipment design by the manufacturer and… - [NTSB LAX91LA172](https://openairdocs.org/ntsb/LAX91LA172.md): Hughes 369C · Papua, Papua New Guinea · Accident · Minor injuries · Limited investigation · Final report · Apr 2, 1991 · N9227F · Destroyed > The loss of control of the helicopter due to a restriction of the cyclic control system. - [NTSB NYC90FA029](https://openairdocs.org/ntsb/NYC90FA029.md): Hughes 369HS · North Adams, MA · Accident · 2 fatal · Field investigation · Final report · Nov 15, 1989 · N9208F · Destroyed > Failure of the pilot-in-command (PIC) to assure proper rotor RPM and proper operation of the flight controls during an approach in gusty wind conditions. A factor related to the accident was: the pic's lack of experience in the type of operation. - [NTSB FTW87FA198](https://openairdocs.org/ntsb/FTW87FA198.md): Bell 206B · Pledger, TX · Accident · No injuries · Field investigation · Final report · Aug 12, 1987 · N33PW · Substantial damage > While cruising at 900' AGL, the plt noted a hvy shudder flwd by a grinding noise, loud 'bang' & a low rotor RPM signal. He made an autorotation to a road, but drg touchdown, the main rotor blades flexed dwn & severed the tail boom. An exam revealed the main… - [NTSB MKC87IA070](https://openairdocs.org/ntsb/MKC87IA070.md): Agusta A109 · Lincoln, NE · Incident · No injuries · Incident investigation · Final report · Mar 30, 1987 · N4GH · Minor damage > The PIC stated that he was ground taxiing the helo to the ramp area at duncan aviation to shutdown for refueling. During the taxi, the PIC heard a loud 'bang' eminating fm the rear of the helo. The PIC lowered collective pitch and no further noise was heard… - [NTSB SEA85LA053](https://openairdocs.org/ntsb/SEA85LA053.md): Hughes 369D · Taholah, WA · Accident · Minor injuries · Limited investigation · Final report · Feb 4, 1985 · N8306F · Destroyed > The acft had lifted off during an external load operation when the plt felt a 'vibration/shudder'. The right skid contacted the ground and the helicopter rolled over during an attempt to maneuver the helicopter away from ground personnel. Inspection revealed… - [NTSB LAX84LA314](https://openairdocs.org/ntsb/LAX84LA314.md): Hughes 369D · Honolulu, HI · Accident · No injuries · Limited investigation · Final report · May 25, 1984 · N211EH · Substantial damage > The helicopter experienced a tail rotor failure shortly after departing the airport on a VFR local sling loading flt. The plt stated that, 'at approx 500 ft asl on climb out experienced sudden, severe vibration. Made a 180 degree turn to return to airport &… - [NTSB FTW82DA323](https://openairdocs.org/ntsb/FTW82DA323.md): Bell 206B · Grand Isle, LA · Accident · Serious injuries · Final report · Aug 8, 1982 · N59504 · Destroyed > The pilot was approaching an offshore platform for landing at about 100 ft AGL when he felt the helicopter shudder. He also heard an engine-out horn and a low-rotor-rpm warning. He turned away from the platform, popped the emergency floats and initiated an… ## 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 ('03013', '03012') 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=03013&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.