# Accident 19891010039579A: Hiller UH12E, Yuma, AZ, October 10, 1989

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: October 10, 1989, 19:27 local time
- Place: Yuma, AZ
- Damage: Substantial damage
- Phase of flight: Pwr Off Vert Land/Autorotate
- Operating rules: Agricultural (Part 137)
- Operator: RQKG
- Location: 32.6794° N, 114.6592° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=32.6794&lon=-114.6592&mi=10
- Aircraft: N689SB, a cancelled registration (https://openairdocs.org/deregistered/N689SB-2013-05-02) (OpenAirDocs)
- Registry model: Hiller UH-12E (registry code 4360122, https://openairdocs.org/model/hiller-uh-12e) (OpenAirDocs)
- Registry engine: Lycoming VO-540 series (registry code 41534, https://openairdocs.org/engine/lycoming-vo-540-series) (OpenAirDocs)
- Reported make and model: HILLER UH12E
- Reported engine: LYC VO540*
- Fatal injuries: 0
- Pilot flight hours: 12,900 total, 3,900 in this make and model, 120 in the last 90 days
- NTSB investigation: [NTSB LAX90DUJ03](https://openairdocs.org/ntsb/LAX90DUJ03) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19891010039579A

## Narrative

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

TORSIONAL COUPLING FAILED DURING AG OPERATION. BRIEF AUTOROTATION TO IMPACT.

## 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 LAX90DUJ03](https://openairdocs.org/ntsb/LAX90DUJ03), Oct 11, 1989: Hiller UH-12E (N689SB), Yuma, AZ, substantial damage. Probable cause: THE PILOT MISJUDGED THE FLARE ALTITUDE. CONTRIBUTING TO THIS ACCIDENT WAS THE FAILURE OF THE ENGINE TORSIONAL COUPLING WHICH ULTIMATELY CAUSED THE TOTAL LOSS OF POWER.

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.

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