The pilot reported that, during final approach, the Cessna 150’s engine sputtered and then lost all power.
The plane landed short of the runway on the threshold at the airport in Everett, Washington, and the nose landing gear collapsed.
The airplane sustained substantial damage to the engine truss and mount.
Post-accident examination by an FAA inspector revealed no evidence of preaccident mechanical malfunctions or failures that would have precluded normal operation.
A photograph provided by the inspector showed no damage to the propeller, which is consistent with the engine not producing power at the time of impact.
The inspector reported that fuel was present in the tanks, that the gascolator screen was found clear of debris, and that he suspected carburetor ice was responsible for the loss of engine power.
The airport’s automated weather observation station reported that, about the time of the accident, the wind was from 310° at 7 knots, the temperature was 72°F, and the dew point was 48°F. The atmospheric conditions were favorable for serious carburetor icing at descent power setting.
Probable cause: A total loss of engine power due to carburetor icing during final approach, which resulted in a hard landing short of the runway and the nose landing gear collapsing.
This July 2018 accident report is provided by the National Transportation Safety Board. Published as an educational tool, it is intended to help pilots learn from the misfortunes of others.