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ASN Wikibase Occurrence # 66497
Last updated: 3 February 2020
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Date:19-JUL-2009
Time:11:00
Type:Silhouette image of generic C170 model; specific model in this crash may look slightly different
Cessna 170B
Owner/operator:Private
Registration: N8339A
C/n / msn: 25191
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Category:Accident
Location:Mahwah, New Jersey -   United States of America
Phase: En route
Nature:Private
Departure airport:Westfield, MA (BAF)
Destination airport:Mahwah, NJ (TEB)
Investigating agency: NTSB
Narrative:
During a cross-country flight, the airplane’s engine began to vibrate heavily, lost all power, and the pilot executed an emergency landing in a field. During the landing roll, the airplane impacted a hill, and sustained substantial damage. On a previous flight, the pilot recalled a vague vibration while en route. A mechanic was unable to identify the source of the vibration, and a "no defects noted" statement was entered into the logbook after various component checks. Examination of the airplane by a Federal Aviation Administration (FAA) inspector revealed that the No.1 cylinder revealed that two thru bolt nuts were loose. Two of the other bolts were sheered off, and one was missing. The threads on the thru bolt, with the missing nut, were rusted.
Probable Cause: A loss of engine power due to the failure of the No. 1 cylinder thru bolt hold down nuts due to corrosion.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20090719X22537&key=1


Revision history:

Date/timeContributorUpdates
20-Jul-2009 10:41 slowkid Added
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
02-Dec-2017 15:48 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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