ASN Wikibase Occurrence # 365382
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| Date: | Friday 3 May 1991 |
| Time: | 19:00 LT |
| Type: |  Hiller UH-12E |
| Owner/operator: | San Joaquin Helicopters Inc. |
| Registration: | N4414 |
| MSN: | 2205 |
| Total airframe hrs: | 12556 hours |
| Engine model: | LYCOMING VO-540-C2A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Delano, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
SHORTLY AFTER LIFING OFF A PRIVATELY OWNED AIRSTRIP THE ENGINE EXPERIENCED AN OVERSPEED CONDITION. THE PILOT EXECUTED AN AUTOROTATION INTO AN OPEN FIELD. DURING THE AUTOROTATION THE PILOT MISJUDGED THE FLARE ALTITUDE, LANDED HARD CAUSING THE MAIN ROTOR BLADES TO SEVERE THE TAILBOOM ASSEMBLY. THE HELICOPTER ROLLED OVER ONTO ITS LEFT SIDE AS THE FORWARD LEFT SKID DUG INTO THE SOFT TERRAIN.
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 THE SOFT DIRT TERRAIN.
Accident investigation:
 |
|
Sources:
NTSB LAX91LA191
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Mar-2024 09:33 | ASN Update Bot | Added |
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