# NTSB investigations: Mcdonnell Douglas Helicopter 500N

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 WPR22FA101](https://openairdocs.org/ntsb/WPR22FA101.md): Mcdonnell Douglas 500N · Newport Beach, CA · Accident · 1 fatal · Class 3 · Field · Final report · Feb 20, 2022 · N521HB · Substantial damage
  > The helicopter’s encounter with unanticipated right yaw during a low-altitude, low-airspeed, tight-radius orbit. Contributing to the accident was the pilot’s distraction during the orbit, which resulted in the loss of control, his fatigue due to his early…
- [NTSB WPR14LA341](https://openairdocs.org/ntsb/WPR14LA341.md): Mcdonnell Douglas Helicopter 500N · Idaho Falls, ID · Accident · No injuries · Limited investigation · Final report · Aug 12, 2014 · N18GH · Substantial damage
  > The pilot’s loss of helicopter control for reasons that could not be determined because postaccident examination of the helicopter did not reveal any mechanical malfunctions or failures that would have precluded normal operation.
- [NTSB WPR10TA025](https://openairdocs.org/ntsb/WPR10TA025.md): Mcdonnell Douglas Helicopter 500N · Los Alamitos, CA · Accident · No injuries · Final report · Oct 16, 2009 · N521HB · Substantial damage
  > The flight instructor's delayed remedial action during the instructional autorotative landing, which resulted in a failure to maintain an adequate rotor rpm to avoid a hard landing.
- [NTSB LAX01IA262](https://openairdocs.org/ntsb/LAX01IA262.md): Mdhi 520N · Los Angeles, CA · Incident · No injuries · Incident investigation · Final report · Jul 25, 2001 · N953SD · Minor damage
  > the excitation of the first bending mode natural frequency of the aft tube assembly that is installed through the rotating NOTAR fan drive system. Contributing factors to the incident included the operator's maintenance practice of hand-sanding the pitch…
- [NTSB LAX00TA186](https://openairdocs.org/ntsb/LAX00TA186.md): McDonnell Douglas 500N · Los Angeles, CA · Accident · No injuries · Final report · May 8, 2000 · N955SD · Substantial damage
  > The combined failure of the operator management and the check pilot to ensure the landing area was suitable for the slide on landing. Factors were the high vegetation that entangled the skids, resulting in the abrupt stop and nose down movement of the…
- [NTSB LAX00GA025](https://openairdocs.org/ntsb/LAX00GA025.md): McDonnell Douglas 500N · San Jose, CA · Accident · 2 fatal · Final report · Oct 25, 1999 · N904PD · Destroyed
  > The pilot's in-flight loss of control due to the failure and separation of the forward thruster control cable telescoping sleeve ball swivel fitting, which resulted in a stuck thruster and the entry into an uncontrollable yaw/spin. Also causal was the…
- [NTSB LAX98LA166](https://openairdocs.org/ntsb/LAX98LA166.md): McDonnell Douglas 520N · Lanai City,Maui, HI · Accident · Minor injuries · Limited investigation · Final report · May 20, 1998 · N112HD · Destroyed
  > An oil starvation failure of the number 5 bearing for undetermined reasons.
- [NTSB FTW96TA222](https://openairdocs.org/ntsb/FTW96TA222.md): McDonnell Douglas MD-520N · Bethany, OK · Accident · No injuries · Final report · May 16, 1996 · N520DD · Substantial damage
  > The main rotor blades' contact with the tail boom due to gusting winds during rotor deceleration.

## 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.aircraft_model_code IN ('3027374'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=3027374

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