# NTSB investigations, 2012: Ground resonance

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 WPR13TA051](https://openairdocs.org/ntsb/WPR13TA051.md): Eurocopter AS350B3 2B1 · Newfield, AZ · Accident · Minor injuries · Final report · Nov 23, 2012 · N3984A · Substantial damage
  > The pilot's distraction while retrieving an item behind him while the helicopter was on the ground with the engine running, which led to his aggressive overapplication of the flight controls after experiencing a ground resonance condition and subsequent loss…
- [NTSB CEN12LA343](https://openairdocs.org/ntsb/CEN12LA343.md): Schweizer 269C · Denver, CO · Accident · No injuries · Limited investigation · Final report · Jun 2, 2012 · N2196F · Substantial damage
  > The inadequately overhauled landing gear dampers that allowed initiation of a ground resonance event from which the pilot was unable to recover. Contributing to the accident was the overhaul facility's failure to identify the overcharged dampers and a lack of…
- [NTSB CEN12LA353](https://openairdocs.org/ntsb/CEN12LA353.md): Schweizer 269C-1 · Chesterfield, MO · Accident · No injuries · Limited investigation · Final report · May 26, 2012 · N345MH · Substantial damage
  > The undercharged and overcharged landing gear dampers, which allowed initiation of the ground resonance event from which the pilot was unable to recover due to his limited experience in helicopters. Contributing to the accident was the ineffective damper…
- [NTSB CEN12LA247](https://openairdocs.org/ntsb/CEN12LA247.md): Hughes 269A · Grinnell, IA · Accident · No injuries · Limited investigation · Final report · Apr 17, 2012 · N69HJ · Substantial damage
  > The pilot's improper liftoff technique, which resulted in ground resonance, and the pilot's delayed recognition of the ground resonance.

## 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 year(c."eventDate") = 2012
  AND c."mKey" IN (SELECT s.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s."tier2Number" = '232' 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/232/sequence?year=2012

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