JOHN DAY, OR, USA
N4175X
AERO COMMANDER 100-180
WHILE ELK SPOTTING IN MOUNTAINOUS TERRAIN, THE AIRCRAFT COLLIDED WITH TREES IN A NOSE LOW TURN SIMILAR TO THE INTERMEDIATE STAGES OF A STALL. A SEVERE POST IMPACT FIRE ERUPTED. THE DENSITY ALTITUDE AT THE ACCIDENT SITE ELEVATION WAS APPROXIMATELY 10,100 FEET. ALL SPARK PLUGS WERE FOUND TO BE EXCESSIVELY WORN AND FIRED INTERMITTENTLY DURING TESTING. TWO OF THE SPARK PLUGS WERE FOUND TO BE LEAD FOULED. THE FLAPS WERE FOUND IN THE FULL DOWN POSITION AND TREE LIMBS, APPROXIMATELY 3 INCHES IN DIAMETER, WERE FOUND WITH SMOOTH SLASHES DIAGONALLY THROUGH THEM.
Source: NTSB Aviation Accident Database
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