ASN Wikibase Occurrence # 38679
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| Date: | Saturday 19 September 1998 |
| Time: | 14:30 LT |
| Type: | Revolution Mini 500 |
| Owner/operator: | Allen G. Barklage |
| Registration: | N611AB |
| MSN: | 0294 |
| Total airframe hrs: | 96 hours |
| Engine model: | Rotax 582 |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Cahokia, IL -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | (KCPS) |
| St. Charles, MO (3SQ) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A witness watched the helicopter as it climbed out after takeoff. The witness said that the helicopter was higher than the telephone lines which ran northeast of the airport. 'He was level and climbing, going away from me when all of a sudden, the sound (engine sound) went quiet, followed by a pop. It was not a loud pop.' The helicopter began a shallow descent. At about 30 to 40 feet above the field, the helicopter 'leveled out,' but 'kept coming down.' The witness said he saw the helicopter 'hit' and then 'cartwheel.' Examination of the helicopter's engine revealed scoring marks on the power-takeoff cylinder (front cylinder) piston, and impact marks in the head. Small metallic particles were embedded in the piston head. The power-takeoff cylinder wall showed scuff marks, and the cylinder head showed impact marks. The two power-takeoff spark plugs' showed no gap at the electrodes, and impact marks. No other anomalies were revealed.
Probable Cause: A loss of engine power due to cold seizure of the power-takeoff cylinder. A factor contributing to the accident was the power lines.
Accident investigation:
 |
|
Sources:
NTSB CHI98FA353
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 06-Apr-2024 06:06 | ASN Update Bot | Updated [Time, Aircraft type, Operator, Other fatalities, Departure airport, Source, Narrative, Category, Accident report] |
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