Incident Cirrus SR22 N242MB,
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ASN Wikibase Occurrence # 170594
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Date:Wednesday 22 October 2014
Type:Silhouette image of generic SR22 model; specific model in this crash may look slightly different    
Cirrus SR22
Owner/operator:L H W M Inc
Registration: N242MB
MSN: 0911
Year of manufacture:2004
Total airframe hrs:2512 hours
Engine model:Continental IO-550 SERIES
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Minor
Location:Near Lexington, NC -   United States of America
Phase: En route
Departure airport:Monroe-McGee Field, NC (24NC)
Destination airport:Greensboro/High Point-Piedmont Triad International Airport, NC (GSO/KGSO)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The aircraft experienced an in-flight deployment of the emergency CAPS (Cirrus Airframe Parachute System) and subsequent landing to a field near Lexington, North Carolina.

The commercial pilot was conducting a personal cross-country flight. The pilot reported that, while en route to his destination at a cruise altitude of about 5,000 ft mean sea level, the engine "failed." He flew the airplane toward an open field and deployed the ballistic recovery parachute. He subsequently conducted a successful landing in the field.
An examination of the engine revealed that the crankshaft had fractured between the No. 2 main journal and the No. 2 connecting rod journal. An examination of the crankshaft revealed that the fracture was due to fatigue that had initiated from multiple origins at the fillet radius between the No. 2 main journal and the cheek at the aft end of the journal. The fatigue initiated from surface damage that occurred due to the No. 2 main bearing shifting. The bearing likely shifted due to the improper tightening of the crankcase through bolt nuts and subsequent insufficient clamping force of the crankcase saddle surfaces.
A review of the airplane's maintenance records revealed that the engine was last overhauled 775 total flight hours before the accident, and no records were found indicating that the through bolts had been removed since that time. It is likely that maintenance personnel improperly tightened the crankcase through bolts during the overhaul.

Probable Cause and Findings
Maintenance personnel's improper tightening of the crankcase through bolt nuts during reassembly of the engine at the last overhaul, which resulted in the failure of the crankshaft and the subsequent total loss of engine power.

Accident investigation:
Investigating agency: NTSB
Report number: ERA15IA024
Status: Investigation completed
Download report: Final report



Revision history:

23-Oct-2014 17:30 Geno Added
23-Oct-2014 17:55 Mathique86 Updated [Source, Damage]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
11-Nov-2022 18:40 harro Updated [Departure airport, Destination airport, Source, Narrative]

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