Incident Overview
During a flight, the captain reported that the airplane was at 5,000 feet mean sea level with the propeller rpm at 100 percent and other engine indications normal. A loss of power on the number two engine was described as 'sudden and immediate.' The flightcrew declared an emergency and recovered visually to Grand Forks without further incident.
Crew Actions
Upon the sudden power loss, the flightcrew promptly declared an emergency. They successfully navigated the aircraft visually back to Grand Forks, where the landing was completed without further issues.
Aircraft Examination
Post-flight inspection of the airplane revealed eleven impact marks on the right side of the fuselage. Among these, two impacts penetrated the fuselage side.
Engine Examination
The engine examination showed evidence of overload failure and penetration of the gear box. Fatigue fractures were found in the second stage compressor impeller rim, originating from a heat-affected, rubbed area on the impeller blades. A corresponding rubbed area was evident on the impeller shroud, and aluminum material was fused to the titanium impeller. No evidence of material defects was noted.