ASN Wikibase Occurrence # 358578
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| Date: | Thursday 27 July 1995 |
| Time: | 09:30 LT |
| Type: | Revolution Helicopter MINI-500 |
| Owner/operator: | Revolution Helicopter Corp. |
| Registration: | N500ZZ |
| MSN: | 0000 |
| Total airframe hrs: | 210 hours |
| Engine model: | ROTAX 582 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Oshkosh, WI -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | , WI (KOSH) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The amateur-built helicopter was conducting a demonstration flight during the annual EAA convention. During the first flight after re-jetting of the carburetor, the helicopter experienced a total loss of engine power. During the autorotation into a crop field, the helicopter was substantially damaged when the skid shoes caught in the terrain, failing the left skid and fracturing the shoe on that skid. Subsequent examination of the engine revealed that the rear piston had seized in the cylinder. The owner of the company which produces the helicopter stated that the re-jetting of the carburetor was made in an attempt to achieve what were thought to be correct readings in main rotor RPM and EGT after replacement of both gauges. The company owner attributed the piston seizure to the re-jetting. The skid shoes were new and had been tested only on concrete. The owner said that the design contributed to the damage to the helicopter.
Probable Cause: the inadequate design of the helicopter skid shoes. Factors related to the accident were: false indications of rotor rpm and EGT which led to seizure of the piston.
Accident investigation:
 |
|
Sources:
NTSB CHI95FA242
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 15:54 | ASN Update Bot | Added |
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