# NTSB investigations: Lycoming T53-L-13

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 CEN23FA340](https://openairdocs.org/ntsb/CEN23FA340.md): Richards Heavylift Helo UH-1H · Oakdale, IL · Accident · 1 fatal · Class 3 · Field · Final report · Jul 31, 2023 · N567VF · Substantial damage
  > An in-flight loss of control for undetermined reasons.
- [NTSB WPR22FA098](https://openairdocs.org/ntsb/WPR22FA098.md): Bell UH-1H · Coalinga, CA · Accident · 1 fatal · Class 3 · Field · Final report · Feb 17, 2022 · N72297 · Substantial damage
  > The pilot’s loss of situational awareness for reasons that could not be determined given the available evidence, which led to controlled flight into terrain. Contributing to the accident was the pilot’s decision to operate the helicopter while ill and…
- [NTSB CEN21LA212](https://openairdocs.org/ntsb/CEN21LA212.md): Richards Heavylift Helo UH-1H · Norris City, IL · Accident · No injuries · Class 4 · Limited · Final report · May 10, 2021 · N567VF · Substantial damage
  > The pilot’s improper positioning of the helicopter on the landing pad, and his failure to monitor and control the helicopter as fuel and chemical product were loaded, which led to the helicopter tipping and sliding off the landing pad, and subsequently…
- [NTSB GAA21WA103](https://openairdocs.org/ntsb/GAA21WA103.md): Precision Helicopters UH-1H · Rayón, Mexico · Accident · No injuries · Class 5 · Foreign · May 2, 2021 · N1206G · Substantial damage
- [NTSB GAA19CA344](https://openairdocs.org/ntsb/GAA19CA344.md): Bell UH 1H · Bethel, AK · Accident · No injuries · Data collection · Final report · Jun 6, 2019 · N4085L · Substantial damage
  > The pilot's improper fuel planning, which resulted in fuel exhaustion and a total loss of engine power, and his improper landing flare during a forced autorotation, which resulted in a hard landing. Contributing to the accident were the inoperative fuel…
- [NTSB WPR18LA206](https://openairdocs.org/ntsb/WPR18LA206.md): Bell UH 1H · Oakdale, CA · Accident · Minor injuries · Class 3 · Limited · Final report · Jul 24, 2018 · N107CH · Substantial damage
  > The pilot's loss of control during a precautionary landing following an abnormal noise in-flight, the source of which could not be determined.
- [NTSB WPR18LA147](https://openairdocs.org/ntsb/WPR18LA147.md): Bell UH 1H · Olympia, WA · Accident · Serious injuries · Class 3 · Limited · Final report · May 25, 2018 · N111DR · Substantial damage
  > A loss of tail rotor thrust due to the improper installation of the tail rotor assembly by maintenance personnel resulted in the pilot’s inability to maintain control of the helicopter as he began transition into forward flight from a hover, which resulted in…
- [NTSB WPR18LA004](https://openairdocs.org/ntsb/WPR18LA004.md): Western International Avia UH 1H · Arbuckle, CA · Accident · No injuries · Class 3 · Limited · Final report · Oct 13, 2017 · N247PV · Substantial damage
  > A collective control malfunction for reasons that could not be determined.
- [NTSB WPR15LA178](https://openairdocs.org/ntsb/WPR15LA178.md): Garlick Helicopters UH 1H · Cove, OR · Accident · No injuries · Limited investigation · Final report · May 31, 2015 · N462CC · Substantial damage
  > The failure of the engine-to-transmission drive shaft coupling assembly due to a fatigue fracture of one of its attachment bolts, which resulted in a loss of power to the main rotor.
- [NTSB WPR15LA109](https://openairdocs.org/ntsb/WPR15LA109.md): Bell/Garlick UH 1H · Shelton, WA · Accident · No injuries · Limited investigation · Final report · Feb 19, 2015 · N166DR · Substantial damage
  > The fatigue failure of the engine-to-transmission driveshaft adapter attachment bolt due to the application of inadequate torque on the bolt during assembly.
- [NTSB WPR13FA417](https://openairdocs.org/ntsb/WPR13FA417.md): Bell UH-1V · Cordes Lakes, AZ · Accident · 2 fatal · Field investigation · Final report · Sep 21, 2013 · N22490 · Destroyed
  > The pilot's improper maintenance on the helicopter’s main rotor blade pitch control system, which resulted in an in-flight loss of main rotor blade pitch control, mast bumping, and mast failure.
- [NTSB CEN13FA415](https://openairdocs.org/ntsb/CEN13FA415.md): Bell UH-1H · Dove Creek, CO · Accident · 1 fatal · Field investigation · Final report · Jul 16, 2013 · N775AR · Substantial damage
  > Pilot-induced oscillations caused by the loss of hydraulic assist of the flight controls due to an excessive loss of hydraulic fluid during a critical phase of flight, which resulted in ground impact. Contributing to the accident was an inadequate analysis of…
- [NTSB WPR13FA006](https://openairdocs.org/ntsb/WPR13FA006.md): Garlick Helicopters UH-1H · Shady Cove, OR · Accident · Minor injuries · Field investigation · Final report · Oct 7, 2012 · N1577 · Substantial damage
  > The separation of the tail rotor gearbox and tail rotor assembly as a result of fatigue to the tail rotor gearbox input quill assembly attachment studs.
- [NTSB WPR12LA039](https://openairdocs.org/ntsb/WPR12LA039.md): Williams Helicopter UH-1H · Grand Canyon, AZ · Accident · Serious injuries · Limited investigation · Final report · Nov 15, 2011 · N502AW · Substantial damage
  > The loss of main rotor power due to a main rotor transmission failure from a lack of lubrication.
- [NTSB SEA06WA085](https://openairdocs.org/ntsb/SEA06WA085.md): Garlick UH-1H · Sarawak, Malaysia · Accident · No injuries · Foreign investigation · Apr 25, 2006 · N126AC · Substantial damage
- [NTSB DFW05WA254](https://openairdocs.org/ntsb/DFW05WA254.md): Bell UH-1H · Pisa Flores, Mexico · Accident · 1 fatal · Foreign investigation · Sep 26, 2005 · N3140U · Destroyed
- [NTSB LAX03LA160](https://openairdocs.org/ntsb/LAX03LA160.md): Bell UH-1H · Kahoolawe, HI · Accident · 1 fatal · Limited investigation · Final report · May 22, 2003 · N3280U · Destroyed
  > The pilot's failure to remove the external load cable before the repositioning flight, which resulted in the cable striking the tail rotor in cruise flight.
- [NTSB SEA02FA108](https://openairdocs.org/ntsb/SEA02FA108.md): Garlick UH-1H · Clark Fork, ID · Accident · 1 fatal · Field investigation · Final report · Jun 21, 2002 · N114DR · Substantial damage
  > A failure of unknown origin in the tail rotor drive assembly. Factors include mountainous terrain unsuitable for an emergency landing.
- [NTSB SEA01LA121](https://openairdocs.org/ntsb/SEA01LA121.md): Kaman HH-43B · Mullan, ID · Accident · Minor injuries · Limited investigation · Final report · Jun 26, 2001 · N556D · Substantial damage
  > The development of multiple fatigue cracks which ultimately resulted in the fracture of the 1st stage gas producer turbine rotor sealing disc. Factors contributing to the accident were mountainous/hilly and unsuitable terrain conditions.
- [NTSB DEN01LA077](https://openairdocs.org/ntsb/DEN01LA077.md): Bell UH-1H · Zuni, NM · Accident · No injuries · Limited investigation · Final report · Mar 25, 2001 · N56CF · Substantial damage
  > a hard landing due to the pilot's failure to maintain aircraft control during autorotation/flare. A factor was the total loss of engine power due to mechanical failure.
- [NTSB DEN99LA160](https://openairdocs.org/ntsb/DEN99LA160.md): Bell UH-1H · Silverton, CO · Accident · Minor injuries · Limited investigation · Final report · Sep 6, 1999 · N4085L · Substantial damage
  > The total loss of engine power for undetermined reasons. A factor was the lack of suitable terrain for a forced landing.
- [NTSB SEA97LA025](https://openairdocs.org/ntsb/SEA97LA025.md): Garlick TH-1L · Leavenworth, WA · Accident · 1 fatal · Limited investigation · Final report · Nov 5, 1996 · N465JR · Destroyed
  > Fatigue failure of the vertical stabilizer spar cap and subsequent loss of the rotorcraft's vertical stabilizer. Factors include inadequate inspection or trouble-shooting of the aircraft tail cone and vertical stabilizer at and after the time sheet-metal…
- [NTSB SEA96FA076](https://openairdocs.org/ntsb/SEA96FA076.md): Bell UH-1H · Rainier, WA · Accident · No injuries · Field investigation · Final report · Apr 4, 1996 · N6166R · Substantial damage
  > failure of the forward power shaft (number 21) bearing. A factor relating to the accident was: the lack of suitable, unobstructed terrain for an emergency landing.
- [NTSB LAX95LA030](https://openairdocs.org/ntsb/LAX95LA030.md): Bell UH-1E · Willits, CA · Accident · Minor injuries · Limited investigation · Final report · Nov 1, 1994 · N5088J · Substantial damage
  > that the pilot misjudged the distance between the helicopter and the trees.
- [NTSB LAX94LA132](https://openairdocs.org/ntsb/LAX94LA132.md): Bell TH-1L · Etna, CA · Accident · Minor injuries · Limited investigation · Final report · Feb 23, 1994 · N204AP · Substantial damage
  > The faituge of the gear tooth which caused the failure of the 42-degree gear box.
- [NTSB BFO90DOA01](https://openairdocs.org/ntsb/BFO90DOA01.md): Bell TH-1L · Galax, VA · Accident · Minor injuries · Final report · Aug 1, 1990 · N152RR · Substantial damage
  > The lost of engine power because of a compressor stall.
- [NTSB SEA89FA111](https://openairdocs.org/ntsb/SEA89FA111.md): Oregon Helicopters UH-1L · Baring, WA · Accident · Serious injuries · Field investigation · Final report · Jun 14, 1989 · N157LC · Destroyed
  > Fatigue failure of the tail rotor 42 degree gear box due to pilot induced overstress. Navy data and FAA type certificate limitations were not adhered to.
- [NTSB MIA89LA081](https://openairdocs.org/ntsb/MIA89LA081.md): Bell TH-1L · Greenville, FL · Accident · No injuries · Limited investigation · Final report · Feb 8, 1989 · N204AP · Substantial damage
  > Installation of the improper sprag clutch assembly by the owners maintenance personnel resulting in failure of the sprag clutch and the loss of transmission drive.
- [NTSB ATL88FA213](https://openairdocs.org/ntsb/ATL88FA213.md): Bell TH-1L · Walterboro, SC · Accident · Serious injuries · Field investigation · Final report · Jul 12, 1988 · N465JR · Substantial damage
  > The military surplus helicopter experienced a 42 degree gear box failure while lifting a load of logs. The helicopter subsequently landed hard as the plt was attempting to autorotate to a ldg. Metallurgical examination of the gearbox revealed that a gear…

## 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 ('41551'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41551

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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.