On April 14, 1990, a Boeing A75N1 (registration N1902M) operated by Paul R. Amos was involved in an aviation accident near Pleasant Grove, AR. Investigators recorded the probable cause as: IMPROPER USE OF CARBURETOR HEAT BY THE PILOT, WHICH RESULTED IN CARBURETOR ICING. THE WEATHER (CARBURETOR ICING CONDITION) WAS A RELATED FACTOR. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
During flight, the engine progressively lost power. The pilot made an emergency landing in a small clearing but collided with trees. The pilot sustained a broken leg. No preimpact mechanical problem was found, but icing conditions were possible.
Incident Overview
During a flight, the pilot reported that the engine progressively lost power. An emergency landing was initiated in a small clearing. However, the pilot was unable to bring the aircraft to a stop before it collided with trees at the end of the clearing. As a result, the pilot sustained a broken leg.
Investigation Findings
Following the incident, an investigation was conducted. No preimpact mechanical problem was found with the aircraft or engine. According to icing probability charts, meteorological conditions at the time were conducive for carburetor icing at cruise power. The charts indicated that the temperature and humidity levels were within the range where carburetor icing could occur under the given power settings.
Conclusion
The incident highlights the potential for engine power loss due to carburetor icing in conducive meteorological conditions. No other mechanical issues were identified.