# NTSB investigations: Bell UH-1H, WA

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 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 WPR16LA142](https://openairdocs.org/ntsb/WPR16LA142.md): Bell UH 1H · Mt. Adams, WA · Accident · No injuries · Limited investigation · Final report · Jul 17, 2016 · N790RJ · Substantial damage
  > The pilot’s failure to maintain yaw control as he slowed the helicopter during a landing approach, which resulted in the loss of helicopter control due to the loss of tail rotor effectiveness.
- [NTSB WPR15LA219](https://openairdocs.org/ntsb/WPR15LA219.md): Garlick UH1H · Walla Walla, WA · Accident · Minor injuries · Limited investigation · Final report · Jul 21, 2015 · N121PT · Destroyed
  > The helicopter’s reduction in aerodynamic lift while operating in variable wind conditions for reasons that could not be determined because postaccident examination did not reveal any evidence of preimpact mechanical malfunctions or failures that would have…
- [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 SEA99LA020](https://openairdocs.org/ntsb/SEA99LA020.md): Garlick UH-1H · Darrington, WA · Accident · Serious injuries · Limited investigation · Final report · Dec 14, 1998 · N94NW · Substantial damage
  > The total separation of the vertical fin (stabilizer), as the result of fatigue cracks which initiated in the fourth rivet hole above where the fin extends from the tailboom.
- [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 SEA92TL#03](https://openairdocs.org/ntsb/SEA92TL%2303.md): Bell 206L-3 · Kent, WA · Accident · No injuries · Class 3 · Final report · Oct 24, 1991 · N911KP · 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."eventStateOrRegion" = 'WA' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('1181407'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=1181407&state=WA

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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.