Accident Mooney M20K N1079G,
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ASN Wikibase Occurrence # 201883
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Date:Saturday 2 January 1999
Time:17:40 LT
Type:Silhouette image of generic M20T model; specific model in this crash may look slightly different    
Mooney M20K
Owner/operator:Fraco Incorporated
Registration: N1079G
MSN: 25-0578
Total airframe hrs:2668 hours
Engine model:Continental TSIO-360-LB
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:Delano, CA -   United States of America
Phase: Approach
Departure airport:Elko, NV (KEKO)
Destination airport:Bakersfield, CA (KBFL)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The pilot was on radar vectors for an ILS approach when a complete engine power loss occurred during IMC conditions. The pilot descended through the clouds and fog and collided with trees in an orchard. The pilot said he noticed the low voltage enunciator light illuminate then the oil pressure dropped to zero and the engine seized. Examination of the engine disclosed oil starvation damage and failures to the bearings and connecting rods. The oil pump drive gear was found separated from its shaft and loose in the accessory gear case. A metallurgical examination of the oil pump drive gear revealed rough machine marks located all around the fillet radius between the longitudinal shaft and web portions of the gear.

Probable Cause: The fatigue failure and separation of the oil pump drive from the accessory gear section, which induced an oil starvation failure of the engine. The fatigue failure of the oil pump drive gear was caused by improper machining of the gear's fillet radius during original manufacture.

Accident investigation:
Investigating agency: NTSB
Report number: LAX99LA065
Status: Investigation completed
Duration: 1 year and 11 months
Download report: Final report




Revision history:

26-Nov-2017 09:37 ASN Update Bot Added
08-Apr-2024 11:09 ASN Update Bot Updated [Time, Aircraft type, Other fatalities, Phase, Departure airport, Destination airport, Source, Narrative, Category, Accident report]

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