# NTSB investigations: Allison 250 SER 400HP: Hard landing

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 CEN26LA181](https://openairdocs.org/ntsb/CEN26LA181.md): Hughes 369HS · Durango, CO · Accident · No injuries · Class 4 · Limited · Final report · May 7, 2026 · N926ES · Substantial damage
  > The flight instructor’s inadequate supervision of the pilot receiving the instruction and the pilot’s improper recovery from a practice autorotation in shifting wind conditions, which resulted in a hard landing.
- [NTSB ERA23LA269](https://openairdocs.org/ntsb/ERA23LA269.md): Bell 206B · Orlando, FL · Accident · No injuries · Class 4 · Limited · Final report · Jun 5, 2023 · N27UK · Substantial damage
  > The pilot’s improper landing flare during a practice autorotation, which resulted in a hard landing.
- [NTSB ERA22LA337](https://openairdocs.org/ntsb/ERA22LA337.md): Bell 206B · Pelion, SC · Accident · No injuries · Class 4 · Limited · Final report · Jun 18, 2022 · N515TV · Substantial damage
  > The pilot’s improper landing flare during a practice autorotation.
- [NTSB WPR11CA243](https://openairdocs.org/ntsb/WPR11CA243.md): Bell 206B3 · Glendale, AZ · Accident · No injuries · Data collection · Final report · May 27, 2011 · N59383 · Substantial damage
  > The certified flight instructor's failure to maintain adequate main rotor RPM during the autorotation.

## 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" = '092'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/092/cases?engine=03013

---
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.