ASN Wikibase Occurrence # 355815
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| Date: | Thursday 29 May 1997 |
| Time: | 09:20 LT |
| Type: |  Hiller UH-12E |
| Owner/operator: | Helicair Ag Inc. |
| Registration: | N4029S |
| MSN: | 5129 |
| Year of manufacture: | 1980 |
| Total airframe hrs: | 6440 hours |
| Engine model: | Lycoming VO-540-C2A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Granby, NY -
 United States of America
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | Fulton, NY |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot/owner had completed an uneventful aerial application flight, and he began to reposition the helicopter to another site. En route, at 500 feet AGL, the helicopter's engine began to overspeed. The pilot entered autorotation, and the helicopter struck trees and landed hard. Examination revealed the elastomeric torsional coupling inside the transmission, and the secondary steel drive flanges were sheared. The manufacturer's service data for the coupling stated that mandatory replacement of the coupling should occur at 5,000 hours or 5 years from the date embossed on the rubber, or in accordance with maintenance requirements for the coupling, which ever occurred first. The raised numbers on the coupling indicated a date of May 1988, 9 years before the accident.
Probable Cause: failure of the pilot/owner to replace the torsional clutch as specified by the manufacturer, and subsequent failure of the helicopter's clutch, which resulted in a forced landing (autorotation). A related factor was: the encounter with trees in the emergency landing area.
Accident investigation:
 |
|
Sources:
NTSB NYC97LA101
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Mar-2024 15:58 | ASN Update Bot | Added |
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