NTSB Identification: WPR10LA454
14 CFR Part 91: General Aviation
Accident occurred Saturday, September 11, 2010 in Sierra Vista, AZ
Probable Cause Approval Date: 10/04/2012
Aircraft: EXTRA FLUGZEUGBAU GMBH EA-300, registration: N102EX
Injuries: 1 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
The pilot reported that he had flown the airplane about 6 hours with the recently overhauled engine. During the accident flight, he performed touch-and-go landings and then went to an aerobatic area to perform flight maneuvers. During the maneuvers, he noted that the oil pressure was initially 65 to 70 psi, dropped to about 40 psi, and returned to 70 psi when the airplane was in inverted flight. He then did left and right 90-degree inverted turns. As he completed a steep turn, he noticed that the oil pressure was at 0 psi. Before he could react, the engine seized and stopped. The pilot made a successful landing on a road but had to negotiate around a 45-degree left bend; as the airplane rounded the curve, a vehicle traveling in the opposite direction collided with the left wing. Postaccident examination of the engine revealed that the connecting rod near cylinder Nos. 5 and 6 had failed when the engine seized. Further examination found that the shuttle valve, which controlled oil flow while the airplane was in inverted flight, had a triangular shaped shard of metal wedged under the remaining steel ball. This kept the ball from moving its full travel to the shut off position, resulting in a loss of lubrication to the engine.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: A loss of engine power due to metal debris contamination of the inverted oil system shuttle valve, which resulted in a disruption of oil flow and subsequent oil starvation. Full narrative available
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