Overview
An instructor pilot (IP) and a student pilot were conducting a training flight. The aircraft was warmed up for 5 to 10 minutes at the end of the runway before takeoff. The instructor reported that the before-takeoff run-up was performed using the checklist, and all engine instruments were within normal operating ranges.
Takeoff and Engine Malfunction
During the takeoff roll and initial climb, the aircraft reached approximately 125 feet above ground level (AGL) when the engine stopped. It then started and stopped two more times. The instructor pilot took control of the aircraft from the student and initiated a left turn toward an open field for a forced landing.
Forced Landing and Wire Strike
Before landing, the instructor spotted a telephone line and attempted to avoid both the line and a pole by flying under the wire while turning right. However, during this maneuver, the left wing struck the pole.
Post-Accident Inspection
Following the accident, an examination of the engine revealed excessive soot on the spark plugs of the No. 1 and No. 2 cylinders. An inspection of the carburetor disclosed that an improper nozzle had been installed. During an operational check, the engine ran at 2400 revolutions per minute (RPM) at full power, and the RPM would increase to 2500 RPM when the mixture was leaned. Additionally, excessive popping noises were noted when the engine was operated at a full-rich mixture setting.