# NTSB investigations: Bell UH-1H: Loss of control in flight

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 CEN22FA317](https://openairdocs.org/ntsb/CEN22FA317.md): Bell UH-1H · Chapelle, NM · Accident · 4 fatal · Class 3 · Field · Final report · Jul 17, 2022 · N911SZ · Destroyed
  > The total loss of engine power due to the fatigue failure of the starter-generator input (zerol) gear which failed due to poor maintenance. Contributing to the accident was the unsuccessful autorotation complicated by the setting sun and high density altitude.
- [NTSB WPR20LA280](https://openairdocs.org/ntsb/WPR20LA280.md): Arrow-Falcon Exporters UH-1H · Coalinga, CA · Accident · 1 fatal · Class 3 · Limited · Final report · Aug 19, 2020 · N711GH · Destroyed
  > The pilot’s inability to maintain control of the helicopter due to a hydraulic system failure for reasons that could not be fully determined due to the thermal destruction from the postimpact fire.
- [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 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 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…

## 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.aircraft_model_code IN ('1181407')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s.case_mkey = x.case_mkey AND s.aircrafts_position = x.position AND s."tier2Number" = '240' AND s.case_mkey IN (SELECT case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' WHERE "isDefiningEvent")))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/240/sequence?model=1181407

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