# Accident 19910503014169A: Hiller UH12E, Delano, CA, May 3, 1991

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: May 3, 1991, 19:00 local time
- Place: Delano, CA
- Airport: Private
- Damage: Substantial damage
- Phase of flight: Pwr Off Vert Land/Autorotate
- Operating rules: General operating rules (Part 91)
- Operator: CUFG
- Location: 35.7806° N, 119.2308° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=35.7806&lon=-119.2308&mi=10
- Aircraft: N4414, a cancelled registration (https://openairdocs.org/deregistered/N4414-2014-12-17) (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 VO540C2A
- People aboard: 1
- Fatal injuries: 0
- Pilot flight hours: 1,000 total, 38 in this make and model, 58 in the last 90 days
- NTSB investigation: [NTSB LAX91LA191](https://openairdocs.org/ntsb/LAX91LA191) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19910503014169A

## Narrative

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

ENGINE WENT INTO OVERSPEED ON LIFTOFF. ABORTED,LANDED HARD. MAIN ROTORS SEVERED TAILBOOM. SPRAQUE CLUTCH WORN OUT.

## 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 LAX91LA191](https://openairdocs.org/ntsb/LAX91LA191), May 4, 1991: Hiller UH-12E (N4414), Delano, CA, substantial damage. Probable cause: THAT THE PILOT IMPROPERLY PERFORMED THE AUTOROTATION BY MISJUDGING THE FLARE ALTITUDE. CONTRIBUTING TO THIS ACCIDENT WAS THE TOTAL FAILURE OF THE FREEWHEELING SPRAG CLUTCH DUE TO EXCESSIVE WEAR AND…

## Other reports on N4414 (1)

Matched to the same aircraft by N-number and date.

- [Accident 19791017029019A](https://openairdocs.org/incident/19791017029019A), Oct 17, 1979: Hiller UH12E (N4414), Mendota, CA, Substantial damage. Pilot lost control immediately after takeoff. Left rudder cable found broken during investigation.

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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