Accident Cirrus SR22 G2 N800RW, 16 Nov 2012
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ASN Wikibase Occurrence # 150717
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Type:Silhouette image of generic SR22 model; specific model in this crash may look slightly different    
Cirrus SR22 G2
Registration: N800RW
MSN: 1266
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Location:Sitgreaves National Forest, NE of Pinetop, AZ -   United States of America
Phase: En route
Departure airport:Durango, CO (00C)
Destination airport:Nogales, AZ (OSL)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
While the airplane was in a cruise climb from 12,000 to 14,000 ft mean sea level, the pilot/owner of the airplane heard a loud “pop,” and, about 4 minutes later, he observed an oil pressure annunciation on the primary flight display. Within 1 minute, the pilot saw that the engine had completely lost oil pressure, so he shut down the engine and advised an air traffic controller of the situation. He then asked for and received vectors to the nearest airport, but, during the descent, he recognized that the airplane would be unable to reach the airport. Shortly thereafter, he advised the controller that he would deploy the airplane’s ballistic parachute when the airplane was over suitable terrain. After the pilot deployed the parachute, the airplane impacted a field and came to rest upright.
Postaccident examination of the airplane revealed that a nipple in the flexible oil line used to provide engine oil to an aftermarket engine supercharger had failed due to fatigue, which resulted in a complete loss of engine oil. The fatigue crack had multiple initiation sites that were not the result of any manufacturing or material defects. Evidence indicates that a washer was present on the nipple threads between the nipple and the oil nozzle at one time. The washer initially prevented proper thread engagement and sealing of the joint between the nipple and the nozzle. To seal the joint, the nipple was then overtorqued, which resulted in the fatigue crack initiation. Engine vibration caused the flexible oil line to impose cyclic loads on the nipple, which, over time, failed due to fatigue.
Although the supercharger installation was approved under a Federal Aviation Administration supplemental type certificate (STC), the installation was not in accordance with the STC installation and maintenance instructions or standard maintenance practices. Although review of the supercharger STC installation and maintenance instructions revealed that they did not contain detailed information for installing the oil nozzle or nipple, the lack of this information did not appear to directly contribute to the improper installation of the supercharger on the accident airplane. It could not be determined when or by whom the improper installation was accomplished.

Probable Cause: The fatigue failure of an improperly installed nipple in the oil system of a supplemental type certificate-installed supercharger, which resulted in a complete loss of engine oil during cruise climb.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 4 months
Download report: Final report

Revision history:

17-Nov-2012 01:11 Alpine Flight Added
18-Nov-2012 07:31 sdbeach Updated [Departure airport, Destination airport, Narrative]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
28-Nov-2017 13:54 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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