# NTSB investigations, AK: Dynamic rollover

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 ANC24LA009](https://openairdocs.org/ntsb/ANC24LA009.md): Airbus Helicopters AS350B3 · Palmer, AK · Accident · Minor injuries · Class 4 · Limited · Final report · Dec 26, 2023 · N21FY · Substantial damage
  > The pilot's failure to maintain clearance from snow-covered terrain during the landing approach in flat light conditions.
- [NTSB ANC18CA056](https://openairdocs.org/ntsb/ANC18CA056.md): Eurocopter AS 350 B3 · Kobuk, AK · Accident · Minor injuries · Class 4 · Data collection · Final report · Jul 25, 2018 · N354LA · Substantial damage
  > The pilot's inadvertent dynamic rollover during takeoff.
- [NTSB GAA18CA147](https://openairdocs.org/ntsb/GAA18CA147.md): Robinson Helicopter R44 · Talkeetna, AK · Accident · No injuries · Data collection · Final report · Feb 24, 2018 · N7519G · Substantial damage
  > The pilot’s selection of unsuitable terrain for landing, which resulted in a dynamic rollover.
- [NTSB ANC13CA041](https://openairdocs.org/ntsb/ANC13CA041.md): Bell Helicopter Textron 206L-1 · Anaktuvuk Pass, AK · Accident · No injuries · Data collection · Final report · May 1, 2013 · N1171 · Substantial damage
  > The pilot's failure to maintain lateral control while hovering over an area of snow-covered terrain, in flat light conditions, which resulted in a dynamic rollover.
- [NTSB ANC12CA111](https://openairdocs.org/ntsb/ANC12CA111.md): Robinson Helicopter R22 Beta II · Anchorage, AK · Accident · No injuries · Data collection · Final report · Sep 26, 2012 · N4171J · Substantial damage
  > The flight instructor's inadequate supervision of the student pilot during a hovering autorotation, which resulted in a dynamic rollover.
- [NTSB ANC12FA084](https://openairdocs.org/ntsb/ANC12FA084.md): Mcdonnell Douglas Helicopter 600N · Delta Junction, AK · Accident · 1 fatal · Field investigation · Final report · Aug 8, 2012 · N737TV · Substantial damage
  > The pilot’s failure to clear the left landing gear skid, which resulted in the entanglement of the left landing gear skid with a log, and his subsequent application of collective pitch, which resulted in a dynamic rollover.
- [NTSB ANC12CA025](https://openairdocs.org/ntsb/ANC12CA025.md): Hughes 369 · Trading Bay, AK · Accident · No injuries · Data collection · Final report · Mar 11, 2012 · C-GVEB · Substantial damage
  > The pilot's selection of an unsuitable landing site in flat-light conditions, which resulted in an inadvertent dynamic rollover.
- [NTSB ANC12LA017](https://openairdocs.org/ntsb/ANC12LA017.md): Pzl-Swidnik SW-4 · Fairbanks, AK · Accident · No injuries · Limited investigation · Final report · Jan 15, 2012 · SP-SSW · Substantial damage
  > A loss of control during a simulated hydraulic emergency, which resulted in an inadvertent dynamic rollover from the which the pilot could not recover.
- [NTSB ANC11LA108](https://openairdocs.org/ntsb/ANC11LA108.md): Eurocopter AS 350 BA · Juneau, AK · Accident · No injuries · Limited investigation · Final report · Sep 26, 2011 · N230CH · Substantial damage
  > Upslope wind conditions while the helicopter was operating at ground idle, which resulted in the helicopter rollover. Contributing to the accident was the lack of manufacturer data regarding the effect of upslope wind conditions on helicopter ground idle…
- [NTSB ANC10CA040](https://openairdocs.org/ntsb/ANC10CA040.md): Robinson Helicopter R44 · Seward, AK · Accident · No injuries · Data collection · Final report · May 15, 2010 · N81191 · Substantial damage
  > The pilot's failure to maintain clearance from snow-covered terrain while hovering in flat light conditions, which resulted in a dynamic rollover.

## 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 s.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s."tier2Number" = '231' 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/231/sequence?state=AK

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