# Accident 19850706033369A: Hughes 369HS, Keystone, SD, July 6, 1985

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: July 6, 1985, 11:09 local time
- Place: Keystone, SD
- Airport: Rushmore
- Damage: Destroyed
- Phase of flight: Pwr On Vertical Ldng/Rtrcrft
- Operating rules: General operating rules (Part 91)
- Location: 43.8890° N, 103.4206° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=43.8890&lon=-103.4206&mi=10
- Aircraft: N5410W, a cancelled registration (https://openairdocs.org/deregistered/N5410W-1991-03-28) (OpenAirDocs)
- Registry model: Hughes 369HS (registry code 4470728, https://openairdocs.org/model/hughes-369hs) (OpenAirDocs)
- Reported make and model: HUGHES 369HS
- Reported engine: ALLSN 250C18B
- People aboard: 4
- Fatal injuries: 4
- Pilot flight hours: 1,480 total, 501 in this make and model, 87 in the last 90 days
- NTSB investigation: [NTSB DEN85FA180](https://openairdocs.org/ntsb/DEN85FA180) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19850706033369A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

THE ROTORS SEPARATED FROM THE HELICOPTER. STRAPS FAILED FROM FATIGUE. UNAPPROVED PARTS AND IMPROPER MAINTENANCE.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB DEN85FA180](https://openairdocs.org/ntsb/DEN85FA180), Jul 6, 1985: Hughes 369HS (N5410W), Keystone, SD, destroyed, 4 fatal

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

---
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.