ASN Wikibase Occurrence # 296342
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| Date: | Wednesday 18 December 2002 |
| Time: | 15:21 LT |
| Type: |  Schweizer 269C |
| Owner/operator: | John Raven |
| Registration: | N642KC |
| MSN: | S1682 |
| Year of manufacture: | 1994 |
| Total airframe hrs: | 3784 hours |
| Engine model: | Avco Lycoming HIO-360-D1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Los Banos, California -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Los Banos Municipal Airport, CA (LSN/KLSN) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot and aircraft maintenance technician were performing a post maintenance test flight when a vibration occurred, followed by a total loss of engine power. The commercial certificated helicopter pilot made a forced landing in a muddy field, during which the helicopter received structural damage. Post accident examination revealed a failed exhaust valve in the number 3 cylinder, and that two exhaust spring seats had been installed, one on top of the other, causing excessive spring/valve pressures. The engine had been overhauled about 1.5 service hours prior to the loss of engine power.
Probable Cause: The improper engine overhaul by other maintenance personnel, which resulted in an exhaust valve failure and a total loss of engine power while in maneuvering flight.
Accident investigation:
 |
|
Sources:
NTSB LAX03LA052
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Oct-2022 19:28 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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