# NTSB investigations: Lycoming T-53 series: Loss of control in flight

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 WPR24LA299](https://openairdocs.org/ntsb/WPR24LA299.md): Williams Helicopter UH-1H · Colusa, CA · Accident · Serious injuries · Class 4 · Limited · Final report · Aug 30, 2024 · N710WD · Substantial damage
  > The pilot’s failure to set collective friction which resulted in collective bounce and subsequent loss of control.
- [NTSB WPR22LA339](https://openairdocs.org/ntsb/WPR22LA339.md): Bell 205A-1 · Cougar, WA · Accident · Minor injuries · Class 3 · Limited · Final report · Sep 7, 2022 · N66HJ · Substantial damage
  > The helicopter’s encounter with downdrafts during a low-altitude hovering maneuver while dipping for water.
- [NTSB WPR20LA211](https://openairdocs.org/ntsb/WPR20LA211.md): Bell UH1H · Payson, AZ · Accident · 1 fatal · Class 3 · Limited · Final report · Jul 7, 2020 · N623PB · Destroyed
  > A flight control malfunction due to either a hydraulic hardover or a flight control stiffness event, which resulted in a loss of control.
- [NTSB WPR14LA206](https://openairdocs.org/ntsb/WPR14LA206.md): Williams Helicopter UH 1H · Waitsburg, WA · Accident · Minor injuries · Limited investigation · Final report · May 23, 2014 · N260TA · Substantial damage
  > An extreme vibration immediately after entering forward flight for reasons that could not be determined because postaccident examination of the helicopter did not reveal any anomalies that would have precluded normal operation. Contributing to the accident…
- [NTSB WPR09LA241](https://openairdocs.org/ntsb/WPR09LA241.md): Rotorcraft Development UH-1B · Richvale, CA · Accident · Serious injuries · Limited investigation · Final report · May 13, 2009 · N843M · Substantial damage
  > The pilot's failure to maintain control of the helicopter during takeoff for undetermined reasons.

## 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 ('41552', '41549', '41587')
    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" = '240'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/240/cases?engine=41552

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