# NTSB investigations: Lycoming TVO-435-GIA: 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 ERA26LA100](https://openairdocs.org/ntsb/ERA26LA100.md): Bell 47G-3B · Floral City, FL · Accident · No injuries · Class 4 · Limited · Final report · Jan 29, 2026 · N347BH · Destroyed
  > The student pilot’s loss of helicopter control during landing.
- [NTSB CEN18LA306](https://openairdocs.org/ntsb/CEN18LA306.md): Bell 47G 3B · Custer, SD · Accident · Minor injuries · Class 3 · Limited · Final report · Aug 2, 2018 · N347BH · Substantial damage
  > The pilot’s mismanagement of rotor RPM and subsequent forced landing on uneven terrain which led to a dynamic rollover.
- [NTSB GAA17CA436](https://openairdocs.org/ntsb/GAA17CA436.md): Bell 47G 3B · Toterville, IA · Accident · No injuries · Data collection · Final report · Jul 24, 2017 · N47AH · Substantial damage
  > The pilot’s failure to maintain rotor rpm while maneuvering at low altitude with low airspeed and a tailwind.
- [NTSB WPR16LA069](https://openairdocs.org/ntsb/WPR16LA069.md): Bell 47G 3B 1 · Carson City, NV · Accident · Minor injuries · Limited investigation · Final report · Feb 13, 2016 · N1181W · Substantial damage
  > The pilot's failure to maintain sufficient main rotor rpm, which resulted in a loss of helicopter control and a dynamic rollover.
- [NTSB GAA16CA055](https://openairdocs.org/ntsb/GAA16CA055.md): Bell 47G · Searchlight, NV · Accident · No injuries · Data collection · Final report · Oct 18, 2015 · N73224 · Substantial damage
  > The pilot's failure to maintain adequate clearance from a tree during hover flight.
- [NTSB CEN13FA357](https://openairdocs.org/ntsb/CEN13FA357.md): Bell 47G-3B-1 · Maplewood, MN · Accident · 1 fatal · Field investigation · Final report · Jun 19, 2013 · N5024N · Destroyed
  > The loss of helicopter control for reasons that could not be determined because an examination of the helicopter and its systems revealed no malfunctions or failures that would have precluded normal operation.
- [NTSB CHI08CA192](https://openairdocs.org/ntsb/CHI08CA192.md): Bell 47G-3B · Port Edwards, WI · Accident · Minor injuries · Data collection · Final report · Jul 11, 2008 · N73995 · Substantial damage
  > The pilot failed to maintain control of the helicopter when he inadvertently flared the helicopter and the rotor rpm decayed as a result of sustaining bee stings during an aerial application flight. Contributing to the accidnet included the bees and the low…

## 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 ('41526')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e WHERE e.case_mkey = x.case_mkey AND e.aircrafts_position = x.position AND e."isDefiningEvent" AND e."tier2Number" = '240'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/240/cases?engine=41526

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