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ASN Wikibase Occurrence # 177181
Last updated: 30 October 2020
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Date:21-JUN-2015
Time:11:30
Type:Silhouette image of generic M20T model; specific model in this crash may look slightly different
Mooney M20K 231
Owner/operator:Private
Registration: N1168Z
C/n / msn: 25-0697
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Category:Accident
Location:Town of Wilson, south of Sheboygan, WI -   United States of America
Phase: En route
Nature:Private
Departure airport:Sheboygan, WI (KSBM)
Destination airport:Elkhart, IN (KEKM)
Investigating agency: NTSB
Narrative:
Shortly after takeoff, the pilot advised air traffic control that he was returning to the airport due to low oil pressure. The engine subsequently lost power, and the pilot was forced to land in a wheat field 5 miles south of the airport. During on-site examination of the airplane, no oil was found in the crankcase, and subsequent examination of the engine and turbocharger revealed that the turbocharger was dry. Further examination of the engine revealed evidence of preignition in the No. 5 cylinder that appeared to have been caused by failed spark plugs. The top and sides of the piston head were eroded, which allowed the exhaust gases caused by the preignition to pressurize the crankcase and force engine oil out of the breather tube.

Probable Cause: Oil starvation due to preignition in the No. 5 cylinder as a result of failed spark plugs; the top and sides of the piston head were eroded, which allowed the exhaust gases caused by the preignition to pressurize the crankcase and force engine oil out of the breather tube.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20150622X70018&key=1
https://flightaware.com/live/flight/N1168Z


Revision history:

Date/timeContributorUpdates
22-Jun-2015 02:18 Geno Added
22-Jun-2015 16:22 Geno Updated [Aircraft type, Registration, Cn, Operator, Departure airport, Destination airport, Source, Narrative]
30-Jun-2015 00:57 Geno Updated [Nature, Destination airport, Source]
21-Dec-2016 19:30 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
01-Dec-2017 13:42 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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