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ASN Wikibase Occurrence # 66380
Last updated: 30 September 2019
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Type:Silhouette image of generic C172 model; specific model in this crash may look slightly different
Cessna 172N Skyhawk
Owner/operator:New England Flight Operations Llc
Registration: N4773G
C/n / msn: 17273342
Fatalities:Fatalities: 0 / Occupants: 4
Aircraft damage: Substantial
Location:Great Bear Farms, Rochester, MA -   United States of America
Phase: En route
Departure airport:Nashua, NH (ASH)
Destination airport:Vineyard Haven, MA (MVY)
Investigating agency: NTSB
The pilot reported that the airplane was in cruise flight when the engine developed sporadic engine vibrations. Manipulation of the carburetor heat and mixture controls did not remedy the situation and the engine subsequently developed a severe vibration. The pilot then elected to reduce engine power and perform a precautionary landing to a field. The airplane touched down in a cranberry bog, and sustained substantial firewall and airframe damage. Examination of the wreckage did not reveal any mechanical malfunctions. It was noted that the No. 2 cylinder lower spark plug was fouled and that the compression on the No. 4 cylinder was lower than that of cylinders 1, 2 and 3; however, the reason for the severe engine vibration could not be determined. The airplane had been operated for approximately 74 hours since its most recent 100 hour inspection, which was performed about two months prior to the accident.
Probable Cause: An engine vibration as reported by the pilot, for undetermined reasons.



Revision history:

12-Jul-2009 23:54 slowkid Added
13-Jul-2009 21:24 Anon. Updated
13-Jul-2009 23:45 slowkid Updated
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
02-Dec-2017 15:49 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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