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ASN Wikibase Occurrence # 214447
Last updated: 9 January 2021
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Date:14-AUG-2018
Time:08:00
Type:Silhouette image of generic C150 model; specific model in this crash may look slightly different
Cessna 150M
Owner/operator:Private
Registration: N6341K
C/n / msn: 15077654
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:North of Madison Municipal Airport (KMDS), Madison, SD -   United States of America
Phase: Landing
Nature:Training
Departure airport:Madison Airport, SD (XMD/KMDS)
Destination airport:Madison Airport, SD (XMD/KMDS)
Investigating agency: NTSB
Narrative:
The student pilot reported that he was flying north of the departure airport when the airplane's engine began running roughly. He attempted to return to the airport but was unable to reach the airport and landed in a cornfield. The airplane nosed over in the 7-ft-tall corn and sustained substantial damage to both wings. Examination of the airplane revealed that the engine's No. 3 cylinder exhaust valve was stuck in its valve guide, and the No. 3 exhaust valve rocker arm was fractured. A maintenance record entry indicated that the Nos. 1, 3, and 4 cylinders had experienced valves sticking and had been sent back to the overhaul vendor for service. The cylinders were reinstalled 3 days before the accident. Based on the available evidence, the partial loss of engine power was likely due to the No. 3 cylinder exhaust valve becoming stuck, which resulted in a secondary overload failure of the associated rocker arm and a substantial reduction in engine power output.
 
Probable Cause: A stuck No. 3 cylinder exhaust valve, which resulted in failure of the associated rocker arm, a partial loss of engine power, and the subsequent forced landing into tall vegetation.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20180814X13615&key=1
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=6341K

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year 1 month
Download report: Final report


Revision history:

Date/timeContributorUpdates
15-Aug-2018 20:14 Geno Added
16-Aug-2018 04:49 Geno Updated [Aircraft type, Registration, Cn, Operator, Location, Source, Damage, Narrative]
01-Oct-2019 18:12 ASN Update Bot Updated [Time, Country, Departure airport, Destination airport, Source, Damage, Narrative, Accident report, ]
01-Oct-2019 19:52 harro Updated [Country, Departure airport, Destination airport, Source, Narrative]

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