# Final NTSB investigations: Bell UH-1L

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 FTW98LA405](https://openairdocs.org/ntsb/FTW98LA405.md): Bell UH-1L · Price, UT · Accident · Minor injuries · Limited investigation · Final report · Sep 19, 1998 · N5107J · Substantial damage
  > The pilot's inadvertent loss of tail rotor effectiveness. Factors were the high density altitude flight conditions, the unfavorable wind condition, and the none suitable terrain for an autorotation.
- [NTSB SEA95LA221](https://openairdocs.org/ntsb/SEA95LA221.md): Bell UH-1L · Grace, ID · Accident · Serious injuries · Limited investigation · Final report · Sep 18, 1995 · N70410 · Destroyed
  > the fatigue failure of the centrifugal impeller and the lack of suitable terrain for a forced landing. Factors contributing to the accident were: the lack of required compliance with the FAA Airworthiness Directive by the operator, the insufficiently defined…
- [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 LAX94LA208](https://openairdocs.org/ntsb/LAX94LA208.md): Bell UH-1L · Pleasant Grove, CA · Accident · No injuries · Limited investigation · Final report · May 2, 1994 · N204RW · Destroyed
  > the pilot's failure to see and avoid the power lines due to sun glare from the rising sun at dawn.
- [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 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 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 SEA88LA143](https://openairdocs.org/ntsb/SEA88LA143.md): Bell UH-1E · North Bend, OR · Accident · Minor injuries · Limited investigation · Final report · Aug 4, 1988 · N151LC · Substantial damage
  > Drg a logging opn, the plt noted an apparent transmission malfunction. An autorotative landing was made on unprepared terrain & the helicopter was damaged. An investigation revealed the tail rotor drive input gear in the 42 deg gearbox had failed from…
- [NTSB SEA86FA137](https://openairdocs.org/ntsb/SEA86FA137.md): Bell UH-1L · Wenatchee, WA · Accident · 1 fatal · Field investigation · Final report · May 31, 1986 · N4964N · Destroyed
  > N4964N, a Bell UH-1L, was being operated in logging ops by an experienced, military trained plt who possessed 6000 hrs of flt experience in model. While lifting a sling load gnd crew rptd smoke from the tail rotor area. Plt released sling load & acknowledged…

## 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."completionStatus" = 'Completed'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('1181401'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=1181401&status=final

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