ASN Wikibase Occurrence # 356605
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| Date: | Sunday 6 October 1996 |
| Time: | 08:00 LT |
| Type: |  Bell 47G-5 |
| Owner/operator: | Wayne Hursey Areial Blades |
| Registration: | N7925J |
| MSN: | 25041 |
| Year of manufacture: | 1971 |
| Total airframe hrs: | 5546 hours |
| Engine model: | Lycoming VO-435-A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Nunda, SD -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | Flandreau, SD (SD18) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During the second agricultural load, a total loss of engine power occurred, and the pilot made an autorotative landing, but the helicopter was damaged during the occurrence. Examination of the engine revealed failure of six bolts that attached the accessory drive gear to the crankshaft. Further examination of the attachment bolts revealed that fatigue cracking had occurred. There was evidence that inadequate pre-load torque had been applied to the assembly. The engine had approximately 400 hours since its last overhaul.
Probable Cause: failure of maintenance personnel to properly torque the six accessory drive bolts, which resulted in fatigue failure of the undertorqued bolts.
Accident investigation:
 |
|
Sources:
NTSB CHI97LA004
History of this aircraft
Other occurrences involving this aircraft
| 7 December 1992 | N7925J | Air Crop Care Inc. | 0 | Belle Glade, FL | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 08:59 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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