The aircraft was on a private flight to over-fly a military bush camp. It was seen to fly up the valley over the camp
at approximately 500 feet agl. At the end of the run the aircraft banked to the left to return over the camp. During the
turn, the bank angle reached approximately 90 degrees, and the aircraft entered a spin to the left from which it did not
recover. The carbon monoxide in the pilot's blood was found to be 23 percent. The cabin heater exhaust shroud had recently
been relocated on the exhaust pipe. The new position, however, was over a slip joint, which leaked carbon monoxide into
the cabin air. The pilot in all probability suffered in-flight incapacitation and lost control of the aircraft during
the turn.
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