# NTSB investigations: Allison 250 SER 400HP: 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 CEN25LA266](https://openairdocs.org/ntsb/CEN25LA266.md): Bell B206-B · Bloomington, IL · Accident · Minor injuries · Class 4 · Limited · Final report · Jul 18, 2025 · N975TR · Substantial damage
  > The pilot’s failure to avoid power lines during an aerial application flight.
- [NTSB ERA24LA172](https://openairdocs.org/ntsb/ERA24LA172.md): MD Helicopters 369FF · Ceiba, PR · Accident · No injuries · Class 4 · Limited · Final report · Apr 9, 2024 · N5841Z · Substantial damage
  > The pilots’ failure to ensure adequate clearance from the taxiway while performing a quick stop maneuver.
- [NTSB ERA23LA307](https://openairdocs.org/ntsb/ERA23LA307.md): Bell 206 · Terra Alta, WV · Accident · Serious injuries · Class 3 · Limited · Final report · Jul 21, 2023 · N9913K · Substantial damage
  > The pilot’s inability to maneuver the helicopter for recovery after experiencing a strong, unanticipated tailwind in a confined operating area, which resulted in a descent and subsequent impact with terrain.
- [NTSB GAA16CA165](https://openairdocs.org/ntsb/GAA16CA165.md): Bell 206B · Hanford, CA · Accident · Minor injuries · Data collection · Final report · Mar 26, 2016 · N52Q · Substantial damage
  > The pilot's decision to release the collective while flying at 10 feet above ground level, resulting in the rapid helicopter descent and impact with terrain.
- [NTSB WPR15LA257](https://openairdocs.org/ntsb/WPR15LA257.md): Hughes 369HS · Manra Island, Kiribati · Accident · 1 fatal · Limited investigation · Final report · Sep 3, 2015 · N9068F · Destroyed
  > A The loss of helicopter control for reasons that could not be determined asbecause the helicopter sank in the oceanwater and was not recovered.
- [NTSB CEN11FA053](https://openairdocs.org/ntsb/CEN11FA053.md): Bell 206 · Meeker, CO · Accident · 1 fatal · Field investigation · Final report · Nov 3, 2010 · N8533F · Substantial damage
  > The pilot's failure to maintain clearance from electrical power lines during the low-altitude flight.

## 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 ('03013', '03012')
    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=03013

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