# NTSB investigations: Robinson Helicopter R22 ALPHA, AK

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 ANC17LA013](https://openairdocs.org/ntsb/ANC17LA013.md): Robinson Helicopter R22 · Palmer, AK · Accident · Minor injuries · Limited investigation · Final report · Dec 18, 2016 · N121MR · Substantial damage
  > The pilot's failure to maintain main rotor revolutions per minute (RPM) during a pinnacle landing, which resulted in a main rotor stall condition, a loss of control, and a subsequent impact with terrain. A contributing factor was the flight instructor's…
- [NTSB ANC12CA032](https://openairdocs.org/ntsb/ANC12CA032.md): Robinson Helicopter R22 Alpha · Palmer, AK · Accident · No injuries · Data collection · Final report · Apr 21, 2012 · N121MR · Substantial damage
  > The pilot's selection of unsuitable terrain for landing, which resulted in a tailrotor strike.
- [NTSB ANC85LA121](https://openairdocs.org/ntsb/ANC85LA121.md): Robinson R-22A · Summit Lake, AK · Accident · No injuries · Limited investigation · Final report · Jul 7, 1985 · N8530J · Substantial damage
  > Helicopter struck glassy water lake during a low alt turn. Plt/flt instructor said he became disoriented during the turn, after he looked inside the helicopter briefly to check the rotor RPM. Accident occured during a bright night.

## 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" = 'AK' 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 ('7640104'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=7640104&state=AK

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