# NTSB investigations: Robinson Helicopter R44 II: Loss of lift

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 CEN19LA162](https://openairdocs.org/ntsb/CEN19LA162.md): Robinson R44 · Last Chance, CO · Accident · Minor injuries · Class 3 · Limited · Final report · Jun 8, 2019 · N4504L · Substantial damage
  > The pilot's failure to maintain adequate main rotor rpm while descending with a tailwind during an aerial application maneuver, which resulted in an uncontrolled descent into terrain.
- [NTSB WPR17LA043](https://openairdocs.org/ntsb/WPR17LA043.md): Robinson Helicopter R44 II · Mt. Baldy, CA · Accident · Serious injuries · Limited investigation · Final report · Dec 29, 2016 · N324RS · Substantial damage
  > The pilot's failure to maintain main rotor speed during a low orbiting approach over a confined mountainous area. Contributing to the accident was the pilot's decision to attempt to land in an area that did not allow for a safe exit path under conditions near…
- [NTSB WPR13LA217](https://openairdocs.org/ntsb/WPR13LA217.md): Robinson R44 II · Pomeroy, WA · Accident · No injuries · Limited investigation · Final report · May 2, 2013 · N442RN · Substantial damage
  > The pilot's failure to ensure that the helicopter was properly loaded, which resulted in the helicopter being in excess of its maximum allowable gross weight and led to a loss of main rotor rpm on takeoff. Contributing to the accident were the ground…
- [NTSB CEN12LA359](https://openairdocs.org/ntsb/CEN12LA359.md): Robinson Helicopter R44 II · Santa Teresa, NM · Accident · No injuries · Limited investigation · Final report · Jun 10, 2012 · N744JS · Substantial damage
  > The sudden decrease in headwind during takeoff in a gusty wind and near a passing train, which resulted in a loss of lift and main rotor rpm. Contributing to the accident was the pilot's decision to operate the helicopter near its maximum performance…

## 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 ('7640122', '7640123')
    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" = '500' 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/500/sequence?model=7640122

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