Accident Sequence
The airplane was observed taking off on Runway 13. Shortly after lift-off, witnesses saw the airplane decrease its climb angle or level off at about 200 feet above ground level and turn left. The angle of bank steepened until a point about 120 degrees into the turn. The airplane then stalled and entered a steep nose-down, left-wing-leading attitude until ground impact. Winds were reported from 120 degrees at 8 knots.
Witness Observations
Witnesses stated that it appeared the engine was not developing full power during the takeoff and initial climb.
Investigation Findings
Investigation revealed that the flame tube of the left muffler had separated and partially blocked the outflow from the muffler. This blockage caused back pressure in the exhaust system, evidenced by sooting of the exhaust stacks and plugs on the left side.
Aircraft Maintenance
The airplane had received an annual inspection 11 months prior to the accident, and there were no subsequent entries. Airplane records did not indicate when the mufflers had last been overhauled or replaced.
Pilot Information
The pilot's most recent medical certificate was issued on March 19, 1979.