ASN Wikibase Occurrence # 294741
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| Date: | Monday 26 July 2004 |
| Time: | 09:00 LT |
| Type: |  Schweizer 269C |
| Owner/operator: | Silverhawk Aviation LLC |
| Registration: | N62126 |
| MSN: | S1440 |
| Total airframe hrs: | 3928 hours |
| Engine model: | Lycoming HIO-360-D1A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Homedale, Idaho -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Caldwell Industrial Airport, ID (KEUL) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter was conducting corn pollination operations. The pilot reported that he experienced an engine failure while executing a turn to reverse direction. He further reported that there was a loss of main rotor RPM, and although the pilot attempted to increase rotor RPM by lowering the collective and rolling the throttle "into the overtravel spring," he was unsuccessful in recovering from the low RPM condition. The helicopter landed hard, and the main rotor blades severed the helicopter's tail boom. Initial examination of the engine revealed low compression readings on the cylinders. Partial disassembly of the engine indicated that the low compression was due to loose carbon deposits found on the seating surface of the valves and seats. The carbon was most likely knocked loose during the impact. No other anomalies were noted during the engine examination, and no signatures or conditions were observed consistent with any pre-mishap mechanical malfunction. The reason for the loss of engine power was not determined.
Probable Cause: The loss of engine power for an undetermined reason while maneuvering at low altitude, which resulted in a hard landing.
Accident investigation:
 |
|
Sources:
NTSB SEA04LA146
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Oct-2022 08:36 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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