ASN Wikibase Occurrence # 357019
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| Date: | Friday 19 July 1996 |
| Time: | 18:30 LT |
| Type: |  Hiller UH-12E |
| Owner/operator: | Private |
| Registration: | N124HA |
| MSN: | HA3024 |
| Total airframe hrs: | 4700 hours |
| Engine model: | Lycoming O-540 C2A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Healdsburg, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Healdsburg, CA |
| Healdsburg, CA (O31) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot entered autorotation over unsuitable steep terrain and struck trees after observing split needles on the rotor/engine tachometer. The helicopter had a previous rotor-tach generator failure. The failure was attributed to a loose connection, and was allegedly repaired by the previous owner. The connection was found to produce intermittent and inaccurate instrument readings when the wire bundle was moved or flexed. The potting material within the electrical connector was found in poor condition.
Probable Cause: The failure of the pilot to confirm a loss of power before entering autorotation after reading an erroneous instrument indication on the helicopter's dual tachometer. Factors in the accident were the erratic instrument, and maintenance personnel who failed to properly repair the system after the discrepancy was previously reported.
Accident investigation:
 |
|
Sources:
NTSB LAX96LA279
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 13:19 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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