NTSB Identification: ANC12LA058
Scheduled 14 CFR Part 135: Air Taxi & Commuter
Accident occurred Monday, June 25, 2012 in Gustavus, AK
Probable Cause Approval Date: 04/10/2014
Aircraft: PIPER PA-32-300, registration: N8908N
Injuries: 4 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 scheduled passenger flight was about 11 miles from its destination airport when the airplane’s engine began to lose power and vibrate. After completing the “Engine Power Loss In-Flight” emergency checklist, and with no improvement in engine power or the vibration, the pilot elected to shut down the engine and performed a forced landing on a beach. During the landing, the airplane’s nose landing gear folded back under the airplane, and the engine firewall sustained substantial damage.
An examination of the engine revealed that the crankshaft fractured forward of the #6 bearing journal on the crankshaft through the counterweight web. The fracture surfaces were all consistent with fatigue; however, the cause of the fatigue crack initiation could not be determined.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The fatigue failure of the engine crankshaft for reasons that could not be determined during postaccident metallurgical examination.
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