NTSB Identification: ANC07LA056.
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Accident occurred Tuesday, June 26, 2007 in Anchorage, AK
Probable Cause Approval Date: 08/30/2007
Aircraft: Piper PA-12, registration: N78456
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 private certificated pilot was conducting a personal local flight under Title 14, CFR Part 91, when the accident occurred. The pilot said that during cruise flight the engine started to run rough. He was unable to get the engine to run smoothly, and elected to make a precautionary landing on a grass-covered field. He said the grass was knee to waist high, and the airplane nosed over during the landing roll. The pilot indicated that the wings and rudder were damaged when the airplane nosed over. An aircraft mechanic who examined the airplane after recovery said that during a test run of the engine, the engine appeared to have a malfunctioning magneto. The magneto was sent to a shop for examination, and the technician who examined the magneto, said the upper housing had fractured, allowing the wire-lugs to float internally, and the engine to run rough. He said the damage to the magneto did not appear to be the result of the accident, and that the failure of the upper housing was not uncommon in older airplanes.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The malfunction of an engine magneto during cruise flight, which resulted in a partial loss of engine power, and an on-ground encounter with terrain. A factor associated with the accident was the high vegetation at the off-airport landing site. Full narrative available
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