ASN Wikibase Occurrence # 355689
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| Date: | Wednesday 25 June 1997 |
| Time: | 12:43 LT |
| Type: |  Enstrom F-28-F |
| Owner/operator: | Stits Aircraft |
| Registration: | N99YC |
| MSN: | 809 |
| Year of manufacture: | 1997 |
| Total airframe hrs: | 61 hours |
| Engine model: | Lycoming HIO-360-F1AD |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Riverside, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | , CA (KRAL) |
| Corona, CA (L66) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During takeoff, the helicopter lost power and landed hard. Postaccident examination revealed the No. 2 cylinder intake valve rocker shaft migrated out of the shaft bosses of the cylinder head. The shaft, cover, and nuts were found; the washers were not. According to owner/pilot there were internal star washer imprints on the cover plate commonly caused by torque or tightening of the nut. The helicopter had 61.5 total hours since new, and received one 50-hour inspection since delivery to the owner/pilot. The owner/pilot changed the oil and filter just prior to the inspection.
Probable Cause: failure by unknown maintenance personnel to retorque the nuts on the retainer cover.
Accident investigation:
 |
|
Sources:
NTSB LAX97LA224
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Mar-2024 14:33 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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