# Accident 19990515005379A: Hiller UH12C, Grafton Village, OH, May 15, 1999

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: May 15, 1999, 20:30 local time
- Place: Grafton Village, OH
- Damage: Substantial damage
- Operating rules: General operating rules (Part 91)
- Location: 41.2801° N, 82.0292° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=41.2801&lon=-82.0292&mi=10
- Aircraft: N812WC (not matched to a registry record)
- Reported make and model: HILLER UH12C
- NTSB investigation: [NTSB NYC99LA113](https://openairdocs.org/ntsb/NYC99LA113) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19990515005379A

## Narrative

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

1958 HILLER UH-12C HELICOPTER ENGINE QUIT, THE PILOT ATTEMPTED TO AUTO ROTATE THE ACFT, THE ACFT STRUCK POWER LINES, LANDED IN A FIELD, AND SEVERED THE TAIL, DRIVE SHAFT, AND TAIL ROTOR, OTHER CIRCUMSTANCES ARE UNKNOWN. (-23) THE PILOT STATED THAT HE EXPERIENCED A LOSS OF POWER TO THE ROTOR.  EXECUTED AN AUTOROTATION TO AN OPEN FIELD. ON THE AUTOROTATIONAL APPROACH T HE HELICOPTER STRUCK A POWER LINE. THE HELICOPTER TURNED 180 DEGREES TO THE LEFT AND STRUCK THE GROUND TAIL FIRST.  THE HELICOPTER REMAINED UPRIGHT WHEN IT COLLIDED WITH THE GROUND.

## 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 NYC99LA113](https://openairdocs.org/ntsb/NYC99LA113), May 16, 1999: Hiller UH-12C (N812WC), Grafton, OH, substantial damage. Probable cause: Inadequate maintenance which resulted in the failure of the mercury clutch assembly.

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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