# NTSB investigations: Allison 250 SER 250HP: 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 WPR25LA078](https://openairdocs.org/ntsb/WPR25LA078.md): Bell 206A · Lemoore, CA · Accident · No injuries · Class 4 · Limited · Final report · Jan 14, 2025 · N6255N · Destroyed
  > The pilot’s failure to maintain clearance from power lines while maneuvering at a low altitude.
- [NTSB CEN24LA368](https://openairdocs.org/ntsb/CEN24LA368.md): Bell 206 · Lexington, NE · Accident · Serious injuries · Class 4 · Limited · Final report · Sep 25, 2024 · N92PH · Substantial damage
  > The pilot’s failure to maintain proper clearance from powerlines.
- [NTSB CEN24FA049](https://openairdocs.org/ntsb/CEN24FA049.md): MD Helicopters 600 · Sterling City, TX · Accident · 2 fatal · Class 3 · Field · Final report · Nov 29, 2023 · N745MB · Substantial damage
  > The pilot’s failure to maintain clearance from a power line pole’s static arm during forecasted gusting wind conditions, un-forecasted light turbulence, and un-forecasted low-level wind shear conditions, resulting in main rotor blade contact with the static…
- [NTSB WPR21LA333](https://openairdocs.org/ntsb/WPR21LA333.md): Bell Helicopter Textron 206L-1 · Glide, OR · Accident · Serious injuries · Class 4 · Limited · Final report · Aug 27, 2021 · N303AE · Substantial damage
  > The pilot’s failure to maintain clearance from a tree during an aerial application.
- [NTSB CEN21LA139](https://openairdocs.org/ntsb/CEN21LA139.md): Hughes 369 · Kaufman, TX · Accident · No injuries · Class 4 · Limited · Final report · Feb 26, 2021 · N58431 · Substantial damage
  > The pilot’s failure to maintain clearance from a power line during low-level maneuvering.
- [NTSB CEN11LA646](https://openairdocs.org/ntsb/CEN11LA646.md): Bell 206B · Spicewood, TX · Accident · No injuries · Limited investigation · Final report · Sep 15, 2011 · N3181J · Substantial damage
  > The pilot did not maintain adequate rotor rpm during a low-altitude maneuvering flight.
- [NTSB ERA09LA194](https://openairdocs.org/ntsb/ERA09LA194.md): Hughes 369D · Lee, MA · Accident · Serious injuries · Limited investigation · Final report · Mar 10, 2009 · N369RT · Substantial damage
  > The pilot's failure to maintain clearance from the overhead wire.
- [NTSB SEA08CA091](https://openairdocs.org/ntsb/SEA08CA091.md): Bell 206B · Oxnard, CA · Accident · No injuries · Data collection · Final report · Mar 11, 2008 · N7028J · Substantial damage
  > The pilot's failure to maintain clearance with terrain during an aerial application.

## 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.engine_model_code IN ('03002', '03003')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e WHERE e.case_mkey = x.case_mkey AND e.aircrafts_position = x.position AND e."isDefiningEvent" AND e."tier2Number" = '220'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/220/cases?engine=03002

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OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.