# NTSB investigations: Hughes 500D

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 CEN22LA146](https://openairdocs.org/ntsb/CEN22LA146.md): Hughes 369 · Adair, IA · Accident · Minor injuries · Class 3 · Limited · Final report · Mar 17, 2022 · N500MZ · Substantial damage
  > The mechanic’s failure to properly torque a fuel control unit B-nut, which resulted in a partial loss of engine power, an attempted autorotation, and an impact with terrain.
- [NTSB LAX03FA200](https://openairdocs.org/ntsb/LAX03FA200.md): McDonnell Douglas 369D · Volcano, HI · Accident · 4 fatal · Field investigation · Final report · Jun 15, 2003 · N4493M · Destroyed
  > a loss of engine power due to the fatigue fracture and separation of the compressor coupling adapter. The fatigue fracture was initiated by fretting on the pilot diameter due to both the inadequate design of the coupling and the coaxial misalignment of the…
- [NTSB ANC95LA075](https://openairdocs.org/ntsb/ANC95LA075.md): Hughes 500D · Ketchikan, AK · Accident · Minor injuries · Limited investigation · Final report · Jun 12, 1995 · N549SW · Substantial damage
  > An air leak at a 'b' nut fitting on a pneumatic pc tube to the power turbine governor. Company maintenance personnel did not detect a leak after performing maintenance on the governer and P2 air line.
- [NTSB FTW86LA152](https://openairdocs.org/ntsb/FTW86LA152.md): Hughes 369-500D · Fort Stockton, TX · Accident · No injuries · Limited investigation · Final report · Aug 20, 1986 · N4493M · Substantial damage
  > The helicopter pilot entered autorotation after experiencing fuel exhaustion. The pilot knew he was low on fuel, but was depending on his warning light to indicate low fuel. The warning light never came on. On touchdown the tail rotor struck the ground…
- [NTSB ANC82DA062](https://openairdocs.org/ntsb/ANC82DA062.md): Hughes 369D · Near Bornite, AK · Accident · 1 fatal · Final report · Jul 28, 1982 · N820Y · Destroyed
  > Two workers were transported to a mine drilling site where the helicopter was landed on a man-made heli-pad. The heli-pad was an area about 50 ft long and 12 ft wide that had been cut into the side of a rocky hill. After off-loading the workers, the pilot…
- [NTSB DEN80FTC12](https://openairdocs.org/ntsb/DEN80FTC12.md): Hughes 369D · Chugwater, WY · Accident · Minor injuries · Closed · Apr 9, 1980 · N49667 · Destroyed

## 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 ('4470806'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=4470806

---
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.