# NTSB investigations, WI: Low altitude operation/event

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 CEN24LA275](https://openairdocs.org/ntsb/CEN24LA275.md): Bell 206B · Cuba City, WI · Accident · Minor injuries · Class 4 · Limited · Final report · Jul 21, 2024 · N67110 · Substantial damage
  > The pilot’s failure to maintain clearance from a wire during an agricultural application pass.
- [NTSB CEN21LA349](https://openairdocs.org/ntsb/CEN21LA349.md): Robinson Helicopter R44 II · Randolph, WI · Accident · Serious injuries · Class 4 · Limited · Final report · Jul 31, 2021 · N285RG · Substantial damage
  > The pilot’s failure to maintain clearance from power lines during a low-level aerial application flight.
- [NTSB CEN21LA452](https://openairdocs.org/ntsb/CEN21LA452.md): Robinson Helicopter R44 · Mineral Point, WI · Accident · No injuries · Class 4 · Limited · Final report · Jul 20, 2021 · N44XB · Substantial damage
  > The pilot’s failure to see and avoid a wire during an aerial application flight, resulting in a collision with the wire.
- [NTSB CEN21LA021](https://openairdocs.org/ntsb/CEN21LA021.md): Robinson Helicopter R44 II · Washington, WI · Accident · No injuries · Class 4 · Limited · Final report · Oct 18, 2020 · N31136 · Substantial damage
  > The pilot’s failure to maintain lateral control during a hover and improper recovery action after the helicopter contacted the ground, which resulted in a dynamic rollover sequence and an impact with terrain.
- [NTSB CEN20CA300](https://openairdocs.org/ntsb/CEN20CA300.md): Robinson R44 · Dickeyville, WI · Accident · No injuries · Class 4 · Data collection · Final report · Jul 20, 2020 · N570WH · Substantial damage
  > The pilot did not maintain clearance from wires during an aerial application flight.
- [NTSB CEN18FA215](https://openairdocs.org/ntsb/CEN18FA215.md): Robinson Helicopter R44 · Oshkosh, WI · Accident · 1 fatal · Field investigation · Final report · Jun 9, 2018 · N529DW · Substantial damage
  > The pilot's decision to fly over the river at a low altitude and his failure to maintain clearance with wires during low-level flight.
- [NTSB GAA17CA491](https://openairdocs.org/ntsb/GAA17CA491.md): Robinson Helicopter R44 · Westby, WI · Accident · No injuries · Data collection · Final report · Aug 14, 2017 · N97UP · Substantial damage
  > The pilot's failure to see and avoid power lines while maneuvering at low altitude.
- [NTSB CEN15CA348](https://openairdocs.org/ntsb/CEN15CA348.md): Robinson R44 · Kansasville, WI · Accident · Minor injuries · Data collection · Final report · Aug 7, 2015 · N20KD · Destroyed
  > The pilot's inability to see and avoid power lines that were low to the ground and a green color that blended with the background crops.
- [NTSB CEN14CA426](https://openairdocs.org/ntsb/CEN14CA426.md): Robinson Helicopter R44 · Lancaster, WI · Accident · No injuries · Data collection · Final report · Aug 13, 2014 · N8343P · Substantial damage
  > The pilot's inadequate monitoring of the environment and failure to maintain clearance from transmission wires during an aerial application flight.
- [NTSB CEN13LA395](https://openairdocs.org/ntsb/CEN13LA395.md): Bell 47G-3B-1 · Plover, WI · Accident · Minor injuries · Limited investigation · Final report · Jul 6, 2013 · N7924S · Substantial damage
  > The pilot’s failure to maintain proper engine rpm, which resulted in a high rate of descent and ground impact.
- [NTSB CEN12CA464](https://openairdocs.org/ntsb/CEN12CA464.md): Bertram William J Bertram 2000 · Shiocton, WI · Accident · Serious injuries · Data collection · Final report · Jul 21, 2012 · N115WB · Substantial damage
  > The pilot’s distraction with taking photographs, which resulted in his failure to maintain sufficient altitude to avoid the guy wire.
- [NTSB CEN11LA177](https://openairdocs.org/ntsb/CEN11LA177.md): Piper PA-16 · Lake Koshkonong, WI · Accident · Minor injuries · Limited investigation · Final report · Feb 5, 2011 · N5945H · Substantial damage
  > A loss of engine power for undetermined reasons during a low-altitude pass over a frozen lake.
- [NTSB CEN10CA251](https://openairdocs.org/ntsb/CEN10CA251.md): Robinson Helicopter R44 · Baraboo, WI · Accident · No injuries · Data collection · Final report · May 15, 2010 · N570MD · Substantial damage
  > The pilot's failure to maintain clearance with crops while maneuvering during aerial application.
- [NTSB CEN09GA242](https://openairdocs.org/ntsb/CEN09GA242.md): Cessna 337 · Pittsville, WI · Accident · 1 fatal · Final report · Apr 8, 2009 · N2489S · No damage
  > The pilot's failure to maintain adequate airspeed which resulted in an aerodynamic stall at a low altitude.
- [NTSB CHI08LA124](https://openairdocs.org/ntsb/CHI08LA124.md): Piper PA-25-235 · New Lisbon, WI · Accident · 1 fatal · Limited investigation · Final report · May 5, 2008 · N4352Y · Substantial damage
  > The pilot's failure to maintain adequate altitude during a course reversal at the completion of an agricultural spray run.

## 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" = 'WI' 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" = '220' 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/220/sequence?state=WI

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