# Fatal NTSB investigations: Lycoming T-53 series 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 ANC22FA047](https://openairdocs.org/ntsb/ANC22FA047.md): Bell UH1B · Clear, AK · Accident · 1 fatal · Class 3 · Field · Final report · Jun 27, 2022 · N9970F · Destroyed > A loss of control for reasons that could not be determined based on the available information. - [NTSB WPR20LA211](https://openairdocs.org/ntsb/WPR20LA211.md): Bell UH1H · Payson, AZ · Accident · 1 fatal · Class 3 · Limited · Final report · Jul 7, 2020 · N623PB · Destroyed > A flight control malfunction due to either a hydraulic hardover or a flight control stiffness event, which resulted in a loss of control. - [NTSB ERA20FA027](https://openairdocs.org/ntsb/ERA20FA027.md): Grumman OV-1 · Stuart, FL · Accident · 1 fatal · Class 3 · Field · Final report · Nov 1, 2019 · N10VD · Destroyed > The pilot’s improper recovery from a low-altitude aerobatic maneuver, which resulted in descent into terrain. - [NTSB WPR10FA295](https://openairdocs.org/ntsb/WPR10FA295.md): Kaman Aerospace K-1200 · Donnelly, ID · Accident · 1 fatal · Field investigation · Final report · Jun 16, 2010 · N134WC · Substantial damage > The collision of two counter-rotating main rotor blades for undetermined reasons, which resulted in a loss of control. - [NTSB LAX07TA227](https://openairdocs.org/ntsb/LAX07TA227.md): Bell 205 A1++ · Happy Camp, CA · Accident · 1 fatal · Final report · Jul 23, 2007 · N205BR · Destroyed > the pilot's failure to maintain clearance with the trees during a long-line operation. Contributing factors were the Forest Service's inadequate communication between crews, failure to properly assess the safety of the intended drop zone, reduced visibility… - [NTSB SEA06LA162](https://openairdocs.org/ntsb/SEA06LA162.md): Kaman HH-43F · Metaline Falls, WA · Accident · 1 fatal · Limited investigation · Final report · Aug 18, 2006 · N559D · Destroyed > The failure of the left-hand cross-shaft input internal spline while the helicopter was in a hover, which resulted in the loss of gear box timing, in-flight blade contact and separation, and the subsequent loss of control and impact with a log deck. - [NTSB SEA01LA046](https://openairdocs.org/ntsb/SEA01LA046.md): Western International UH-1H · Darby, MT · Accident · 1 fatal · Limited investigation · Final report · Feb 7, 2001 · N205GL · Substantial damage > Inflight loss of a tail rotor pitch change link-to-blade grip attach bolt, resulting partial loss of tail rotor control, and subsequent entanglement of the helicopter's external load cable with a tree during emergency descent. Factors included the pilot's… - [NTSB LAX98GA127](https://openairdocs.org/ntsb/LAX98GA127.md): Bell 205A-1 · Los Angeles, CA · Accident · 4 fatal · Final report · Mar 23, 1998 · N90230 · Destroyed > An excessive bending load applied to the tail rotor blade assembly of an undetermined origin which produced a fatigue crack, the separation of the assembly, and a forced landing. Factors were the lack of suitable terrain to perform a forced landing, the… - [NTSB SEA97FA196](https://openairdocs.org/ntsb/SEA97FA196.md): Southern Aero UH-1B · Skykomish, WA · Accident · 1 fatal · Field investigation · Final report · Aug 27, 1997 · N896W · Substantial damage > A fatigue fracture in the main rotor mast, which resulted in an in flight separation of the main rotor from the helicopter. Contributing to the accident was insufficient Federal Aviation Administration airworthiness standards and requirements for the aircraft. - [NTSB ANC93FA056](https://openairdocs.org/ntsb/ANC93FA056.md): Bell 204B · Copper Harbor, AK · Accident · 1 fatal · Field investigation · Final report · May 2, 1993 · N204AQ · Destroyed > Fatigue failure of the tail rotor gearbox, and improper helicopter operations being conducted by the operator resulting in repetitive at and over maximum loads. Factors in the accident were: material defect of the tail rotor gear box (inadequate quality… - [NTSB ANC91LA058](https://openairdocs.org/ntsb/ANC91LA058.md): Bell UH-1B · Dog Fish Bay, AK · Accident · 1 fatal · Limited investigation · Final report · May 21, 1991 · N87966 · Destroyed > The pilot's exceeding the gross weight of the aircraft and inadequate supervision by company management. Contributing to the accident was the high vegetation. - [NTSB ATL90FA100](https://openairdocs.org/ntsb/ATL90FA100.md): Bell 205A-1 · Moncks Corner, SC · Accident · 1 fatal · Field investigation · Final report · Apr 20, 1990 · N67HJ · Destroyed > The in-flight separation of the main rotor because of the failure of a pillow block bolt, and the failure of the operator/repair station to follow the overhaul procedures. - [NTSB FTW85FA310](https://openairdocs.org/ntsb/FTW85FA310.md): Bell UH-1B · Saint James, LA · Accident · 1 fatal · Field investigation · Final report · Aug 8, 1985 · N1385W · Destroyed > Acft was at a 150' hover preparing to pick up a log when it experienced a power loss. Witnesses stated that they heard a loud 'bang' and the pilot radioed 'get out of the way'. Acft autorotated thru 60' to 80' trees with very low rotor RPM and impacted with… - [NTSB LAX85FA115](https://openairdocs.org/ntsb/LAX85FA115.md): Bell 205A-1 · Newhall, CA · Accident · 1 fatal · Field investigation · Final report · Jan 18, 1985 · N830V · Destroyed > This helicopter collided with hilly terrain while circling at a low altitude. It was following another helicopter in a clockwise circular pattern at the time, and being filmed for the t.v. series 'air wolf'. One witness observed the helicopter decending in… - [NTSB MIA84FA166](https://openairdocs.org/ntsb/MIA84FA166.md): Bell UH-1B · Clermont, FL · Accident · 1 fatal · Field investigation · Final report · May 10, 1984 · N2252A · No damage > The plt was not aware that two ground attendants were riding the cable during a logging operation when there was an accidental cable release & the attendants fell to the ground. Examination of the acfts hook did not reveal a system failure or malfunction.… - [NTSB DEN80FA060](https://openairdocs.org/ntsb/DEN80FA060.md): Bell UH-1B · Provo, UT · Accident · 1 fatal · Closed · Sep 2, 1980 · N99478 · Substantial damage - [NTSB FTW80FA100](https://openairdocs.org/ntsb/FTW80FA100.md): Bell 205A-1 · Houma, LA · Accident · 13 fatal · Closed · Aug 6, 1980 · N95AL · Destroyed - [NTSB FTW76AF087](https://openairdocs.org/ntsb/FTW76AF087.md): Bell 205-A1 · Gulf Of Mexico (Gulf of Mexico) · Accident · 12 fatal · Closed · Apr 23, 1976 · N8167J · Destroyed ## 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."highestInjuryLevel" = 'Fatal' AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41552', '41549', '41587')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=41552&fatal=1 --- 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.