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ASN Wikibase Occurrence # 77739
Last updated: 14 November 2021
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Type:Silhouette image of generic E300 model; specific model in this crash may look slightly different
Extra EA-300
Registration: N102EX
MSN: 007
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Location:State Route 90 near Sierra Vista, Arizona -   United States of America
Phase: En route
Departure airport:Sierra Vista, AZ (FHU)
Destination airport:Sierra Vista, AZ (FHU)
Investigating agency: NTSB
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.
Probable Cause: 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.



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

Revision history:

11-Sep-2010 22:27 slowkid Added
28-Nov-2011 23:32 RobertMB Updated [Registration, Cn, Operator, Phase, Departure airport, Source, Damage, Narrative]
23-Oct-2014 17:10 Alpine Flight Updated [Time, Departure airport, Narrative]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
26-Nov-2017 18:10 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]

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