ASN Wikibase Occurrence # 357363
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| Date: | Wednesday 22 May 1996 |
| Time: | 10:15 LT |
| Type: |  RotorWay Exec |
| Owner/operator: | Cobb International, Inc |
| Registration: | N89678 |
| MSN: | RI 5026 |
| Engine model: | Rotorway 162 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Chandler, AZ -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | (P19) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The dual student began to apply power during a normal approach to landing when the main rotor rpm needle went into the yellow arc on the engine gauge. The CFI applied full power but the rpm continued into the lower portion of the arc. The helicopter made ground contact with low rotor rpm and the right skid collapsed. The helicopter bounced and rolled over. Examination of the engine revealed that a section of the piston from the dome to the first ring groove had broken away. The upper ring was broke and pieces were found in the combustion area. Normal carbon buildup was found on the cylinder sleeve above the top ring surface except in the area of the piston breakage, indicating that the engine had been operating for a period of time after the damage had taken place and before the accident.
Probable Cause: a loss of engine power due to a failed piston and piston ring in a critical phase of flight.
Accident investigation:
 |
|
Sources:
NTSB LAX96LA210
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 17:07 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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