ASN Wikibase Occurrence # 366698
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| Date: | Thursday 28 June 1990 |
| Time: | 15:18 LT |
| Type: | Homebuilt JP-350-1 |
| Owner/operator: | Private |
| Registration: | N350JP |
| MSN: | 88350-1 |
| Engine model: | LYCOMING L-1174-61 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Torrance, CA -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT OF THE HOMEBUILT SERVICED THE PROPELLER HUB WITH 120 PSI PRIOR TO DEPARTURE. AFTER TAKEOFF HE LOST CONTROL OF THE PROPELLER AND THE ENGINE LOST THRUST. EXAMINATION OF THE PROPELLER ASSEMBLY REVEALED NO EVIDENCE OF A PRE-IMPACT MALFUNCTION. THE PROPELLER BLADES HAD BEEN SHORTENED AND THE PROPELLER OVERSPEED OCCURRED BECASUE THE BLADES WERE NOT COUNTERWEIGHTED. HARTZELL STATED THE 120 PSI CHARGE IN THE HUB WAS INSUFFICIENT TO COUNTERACT THE AERODYNAMIC TWISTING MOMENTS AND PREVENT THE OVERSPEED.
Probable Cause: THE AIRCRAFT COLLISION WITH THE GROUND AFTER THE PILOT EXPERIENCED A LOSS OF ENGINE THRUST DUE TO PROPELLER OVERSPEED CONDITION. CONTRIBUTING TO THE ACCIDENT WAS THE PILOT'S IMPROPER SERVICING OF THE PROPELLER HUB THAT ALLOWED THE OVERSPEED TO OCCUR.
Accident investigation:
 |
|
Sources:
NTSB LAX90DUA01
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Mar-2024 11:09 | ASN Update Bot | Added |
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