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ASN Wikibase Occurrence # 201883
Last updated: 16 November 2019
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Date:02-JAN-1999
Time:16:40
Type:Silhouette image of generic M20T model; specific model in this crash may look slightly different
Mooney M20K
Owner/operator:Fraco Incorporated
Registration: N1079G
C/n / msn: 25-0578
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Delano, CA -   United States of America
Phase: Unknown
Nature:Private
Departure airport:Elko, NV (EKO)
Destination airport:Bakersfield, CA (BFL)
Investigating agency: NTSB
Narrative:
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.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001204X00074&key=1


Revision history:

Date/timeContributorUpdates
26-Nov-2017 09:37 ASN Update Bot Added

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