Piper PA-18-150 N8048D accident near North Myrtle Beach, South Carolina

Probable cause

The pilot's inadequate use of carburetor heat during cruise flight, which resulted in a partial loss of engine power and subsequent forced landing.

NTSB analysis

The pilot stated that he was conducting a banner-tow flight; he turned on final approach at 300 feet above ground level (agl) and reduced the power to the idle position. His airspeed was between 60 and 70 mph. The carburetor heat was not activated, which the pilot indicated was company policy. The company refuted the pilot’s statement regarding carburetor heat. The airplane descended to about 10 feet agl and was 50 feet from the banner pick up poles. He added full power and noticed that the rpm was at 2,500, which was 100 rpm less than full power. He pitched the nose up and the airplane climbed to about 200 feet. The rpm continued to decrease to 1500 rpm. The pilot lowered the nose and checked the throttle, and it was full forward. He increased the mixture, and there was no change in rpm. The airplane would not maintain altitude, and he informed the tower that he was going down. He reduced the throttle to the idle position and lowered the flaps to the full down position. He made a forced landing beyond the banner tow grass area, clearing a berm and colliding with the airport perimeter fence. The airplane nosed over and came to a complete stop and the engine stopped running. The pilot turned the fuel off at the fuel selector valve. The pilot stated that he did not experience any mechanical problems with the airframe or flight controls before the accident. A carburetor icing chart indicated that the airplane was at risk of serious icing at glide power given the weather conditions at the time of the accident.

Text from the NTSB. Open the NTSB docket for ERA12LA453 for the full record.