# 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. Page 2 of 2 · 79 cases ## Cases, newest first - [NTSB BFO94LA159](https://openairdocs.org/ntsb/BFO94LA159.md): Bell UH-1B · Carrabasset, ME · Accident · No injuries · Limited investigation · Final report · Aug 31, 1994 · N204JB · Substantial damage > Fracture failure of the tail rotor drive intermediate gearbox. - [NTSB ATL94LA035](https://openairdocs.org/ntsb/ATL94LA035.md): Kaman HH-43B/F · Mobile, AL · Accident · No injuries · Limited investigation · Final report · Dec 29, 1993 · N5197W · Substantial damage > An inadequate major repair by company maintenance personnel who failed to install the cotter pin which secured the retaining nut of the right main rotor hub teeter pin. - [NTSB SEA93LA207](https://openairdocs.org/ntsb/SEA93LA207.md): Bell UH-1B · Pierce, ID · Accident · No injuries · Limited investigation · Final report · Sep 23, 1993 · N3979C · Substantial damage > Separation of the 90 degree gearbox after fatigue failure of the gearbox attach bolts. Factors include hilly/mountainous terrain. - [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 ATL93LA075](https://openairdocs.org/ntsb/ATL93LA075.md): Bell UH1F · Gatlinburg, TN · Accident · Minor injuries · Limited investigation · Final report · Apr 16, 1993 · N4040P · Substantial damage > The loss of engine power for unknown reasons. - [NTSB LAX92T#A16](https://openairdocs.org/ntsb/LAX92T%23A16.md): Bell 204B · Big Sur, CA · Accident · No injuries · Class 3 · Final report · Aug 12, 1992 · N204CR · Substantial damage - [NTSB SEA92T#A04](https://openairdocs.org/ntsb/SEA92T%23A04.md): Bell 205A-1 · Arco, ID · Accident · No injuries · Class 3 · Final report · Aug 3, 1992 · N66HJ · Substantial damage - [NTSB BFO91DOA01](https://openairdocs.org/ntsb/BFO91DOA01.md): Bell UH-1B · Iaeger, WV · Accident · Minor injuries · Final report · Jul 1, 1991 · N91348 · Substantial damage > The loss of engine power for undetermined reasons, while operating over unsuitable terrain. - [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 SEA90TL#03](https://openairdocs.org/ntsb/SEA90TL%2303.md): Bell UH-1B · Yakima, WA · Accident · No injuries · Class 3 · Final report · Jun 21, 1990 · N99634 · Substantial damage - [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 LAX90DUJ05](https://openairdocs.org/ntsb/LAX90DUJ05.md): Bell UH-1E · Mesa, AZ · Accident · No injuries · Final report · Nov 4, 1989 · N138US · Destroyed > The inflight separation of the tail rotor due to improper maintenance procedures and the installation of incorrect attachment hardware on the tail rotor blade pitch change linkages. - [NTSB ATL89FA130](https://openairdocs.org/ntsb/ATL89FA130.md): Bell UH-1E · Aiken, SC · Accident · Serious injuries · Field investigation · Final report · Apr 17, 1989 · N118HS · Substantial damage > Improper installation of a tail rotor pitch change crosshead retention bolt by the company mechanic, which resulted in loosening of the bolt and eventual failure of the tail rotor assembly/blade and subsequent loss of control. Trees at the crash site… - [NTSB DEN87LA199](https://openairdocs.org/ntsb/DEN87LA199.md): Bell 204B · Dubois, WY · Accident · Serious injuries · Limited investigation · Final report · Jul 29, 1987 · N4580Y · Substantial damage > The commercial plt was performing external sling loads in support of seismic operations. The plt reported that the engine failed during a load release and the plt executed an autorotation. This resulted in a hard landing in heavy timber on sloping terrain.… - [NTSB ATL87LA121](https://openairdocs.org/ntsb/ATL87LA121.md): Bell UH-1B · Bay Minette, AL · Accident · No injuries · Limited investigation · Final report · Apr 21, 1987 · N88987 · Destroyed > During a logging operation, the helicopter experienced a complete engine failure shortly after attempting a pickup. The pilot entered an autorotative glide. The helicopter impacted the water and sank. The wreckage examination disclosed that the compressor… - [NTSB LAX86DVA06](https://openairdocs.org/ntsb/LAX86DVA06.md): Bell UH-1B · Chowchilla, CA · Accident · Minor injuries · Final report · Apr 16, 1986 · N910PD · Destroyed > While returning from a spraying operation the plt observed that the main transmission oil pressure gage indicated zero. The plt reported that the engine master caution did not illuminate and that the oil temperature gage was normal. The plt stated that he… - [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 FTW85FA188](https://openairdocs.org/ntsb/FTW85FA188.md): Bell UH-1B · Boutte, LA · Accident · Serious injuries · Field investigation · Final report · Apr 15, 1985 · N2252A · Destroyed > The plt had stabilized acft in a 125' hover, prior to picking up a load, when the eng spooled down and acft entered talltrees with low rotor RPM and pitched nose down as it descended thru the trees. Ground witnesses heard 2 loud 'bangs' prior to the acft… - [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 LAX85LA105](https://openairdocs.org/ntsb/LAX85LA105.md): Bell 204 · Snelling, CA · Accident · No injuries · Limited investigation · Final report · Jan 11, 1985 · N99021 · Substantial damage > Plt vacated the acft with engine at idle & with the blades turning to refuel. The landing platform mounted on the 'nurse' truck was slippery from an oil & copper mixture used in the spraying operation. The helicopter started to slide & the plt reboarded just… - [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 LAX83LA022](https://openairdocs.org/ntsb/LAX83LA022.md): Bell UH-1B · Delano, CA · Accident · Minor injuries · Limited investigation · Final report · Oct 28, 1982 · N15FC · Destroyed > The pilot was making a helicopter spray run and decended into trees on th irst pass after reloading. He got a low RPM light in a reduced power situation. No malfunctions were found. The pilot had made 34 similiar operations during this schedule. - [NTSB LAX82DA264](https://openairdocs.org/ntsb/LAX82DA264.md): Bell 204 · Delano, CA · Accident · No injuries · Final report · Jul 18, 1982 · N910PD · Destroyed > The acft was spraying for mediterranean fruit flies with another acft. Entering a "scissors" or opposite direction pattern with the second helicopter spraying in the opposite direction, the plt had to slow down in order to begin his swath at the completion of… - [NTSB DEN80FA060](https://openairdocs.org/ntsb/DEN80FA060.md): Bell UH-1B · Provo, UT · Accident · 1 fatal · Closed · Sep 2, 1980 · N99478 · Substantial damage - [NTSB DEN80FTA21](https://openairdocs.org/ntsb/DEN80FTA21.md): Bell UH-1B · Red Lodge, MT · Accident · No injuries · Closed · Sep 1, 1980 · N911CD · 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 SEA78FYE05](https://openairdocs.org/ntsb/SEA78FYE05.md): Bell 205A-1 · Castle Rock, WA · Accident · Minor injuries · Closed · Jan 13, 1978 · N67HJ · 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 - [NTSB MIA75DKG49](https://openairdocs.org/ntsb/MIA75DKG49.md): Bell 205A1 · Homerville, GA · Accident · Minor injuries · Closed · Nov 29, 1974 · N59441 · Substantial damage ## 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 ('41552', '41549', '41587')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=41552&page=2 --- 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.