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ASN Wikibase Occurrence # 72656
Last updated: 7 February 2020
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Type:Silhouette image of generic C172 model; specific model in this crash may look slightly different
Cessna 172N
Owner/operator:Bowen Aviation Llc
Registration: N24CV
C/n / msn: 17270186
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Location:Bloomfield, WI -   United States of America
Phase: En route
Departure airport:Aurora, IL (ARR)
Destination airport:Green Bay, WI (GRB)
Investigating agency: NTSB
The pilot stated that during cruise flight he heard a “loud metallic clicking” sound, followed by a “bang” and a vibration. A few seconds later there was another “bang” and the propeller stopped rotating. He subsequently executed a forced landing to a corn field, where the airplane sustained damage to the firewall, nose landing gear, and wings. A postaccident examination on the engine revealed that the No. 3 and No. 4 engine connecting rod bolts had failed. Metallurgical examination determined that the bolts failed as a result of overstress fractures. No evidence of a fatigue fracture was observed. The teardown examination of the engine revealed that the nuts installed on the No. 1 and No. 2 connecting rod bolts were not tightened to the engine manufacturer’s specifications. Maintenance records indicated that the engine had been overhauled and the airplane returned to service about two weeks prior to the accident. At the time of the accident, the engine had been operated about 68 hours since the overhaul. The lack of proper torque on the intact rod bolts/nuts and the overstress failure of the remaining bolts indicates that the connecting rods were not installed properly during the overhaul procedure.
Probable Cause: A total loss of engine power due to the failure of the bolts that held in place the connecting rods to the engine's No. 3 and No. 4 cylinders as a result of the engine overhaul facility's improper installation of the bolts during a recent overhaul.



Revision history:

14-Feb-2010 01:42 slowkid Added
14-Feb-2010 23:44 RobertMB Updated [Aircraft type, Registration, Cn, Operator, Location, Departure airport, Destination airport, Source]
15-Feb-2010 00:05 RobertMB Updated [Source]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
26-Nov-2017 15:24 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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