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ASN Wikibase Occurrence # 146696
Last updated: 7 July 2020
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Type:Silhouette image of generic C172 model; specific model in this crash may look slightly different
Cessna 172M Skyhawk
Registration: N12504
C/n / msn: 17262027
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:South Wayne in Lafayette County WI -   United States of America
Phase: Landing
Departure airport:Kokomo, IN (OKK)
Destination airport:St. Paul, MN (SGS)
Investigating agency: NTSB
The pilot reported that, after about 2 hours 20 minutes of uneventful flight and while cruising at 4,500 ft mean sea level, the engine rpm decreased. He applied carburetor heat, and, about 2 minutes later, the engine rpm decreased to about 1,500, the oil pressure dropped to 0, and the propeller stopped. The oil temperature indicator in the cockpit was in the normal range. The pilot chose to execute a forced landing in a soybean field since an airport was not within glide distance. Upon touchdown in the field, the airplane flipped over and then came to rest inverted.
Examination of the airplane wreckage revealed that a sufficient quantity of oil (about 5 quarts) was present in the engine and that the lubrication system was intact and appeared to be in compliance with applicable airworthiness directives. However, two pieces of foreign plasticlike material, which were about 1/4 inch by 3/8 inch and 1/4 inch by 5/16 inch, respectively, were found lodged in the oil sump screen. The debris likely blocked oil distribution to the engine, which resulted in oil starvation and the subsequent connecting rod failure. It could not be determined how the debris got into the oil system; the exact source of the debris also could not be determined.

Probable Cause: Internal engine component failures, which resulted from oil starvation due to debris in the oil system.


FAA register:


Revision history:

11-Jul-2012 15:52 Geno Added
23-Mar-2015 18:26 Razmith Updated [Aircraft type, Registration, Cn, Location, Narrative, Photo, ]
24-Mar-2015 20:59 Rick Updated [Cn, Location, Departure airport, Destination airport, Narrative]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 20:57 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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