ASN Wikibase Occurrence # 133866
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| Date: | Monday 29 July 1996 |
| Time: | 06:15 LT |
| Type: |  Boeing A75N1 |
| Owner/operator: | Trinkel & Boys |
| Registration: | N68251 |
| MSN: | 75-7976 |
| Total airframe hrs: | 3779 hours |
| Engine model: | Wright R-975-11 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Tracy, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that the engine quit while he was en route to a job and he landed in an alfalfa field. The aircraft collided with a ditch which was obscured by the crops. A postcrash fire erupted and consumed the aircraft. The aircraft was examined by an FAA airworthiness inspector. He reported that the engine crankshaft would rotate; however, no corresponding valve action was noted on any cylinder. The inspector observed a disassembly of the engine and reported that the eight screws which secure the crankshaft hub to the crankshaft gear had sheared. The crankshaft gear rotates all accessory drive gears, including the magnetos.
Probable Cause: A loss of engine power due to the disengagement of the crankshaft gear from it's hub due to the overload shear of the eight retaining screws.
Accident investigation:
 |
|
Sources:
NTSB LAX96LA291
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 09-Apr-2024 05:16 | ASN Update Bot | Updated [Time, Aircraft type, Other fatalities, Source, Narrative, Category, Accident report] |
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