Cessna 172 N8370X accident near Kissimmee, Florida

Probable cause

The student pilot's inadequate preflight inspection of the fuel system, which resulted in a total loss of engine power due to fuel contamination.

NTSB analysis

The student pilot/owner stated that it had rained a lot the week before the accident but that he had sumped the airplane's fuel drains before the flight and found no water or debris. He subsequently began practicing touch-and-go landings. While the airplane was on an extended downwind, the engine stopped producing power. The pilot declared an emergency and attempted a forced landing to the runway. However, the airplane struck a tree and impacted terrain just short of the runway.

During a postaccident examination of the engine, an excessive amount of water was found in both fuel tanks and the carburetor. A small amount of rust-colored debris was also noted in the water drained from the carburetor, and two 1/2-inch-thick pieces of rust buildup were noted along the wall of the carburetor bowl. Based on the amount of water found in the fuel system, it is likely that the engine had ingested water and that the student pilot's preflight inspection was inadequate because he failed to detect the water contamination, which resulted in a total loss of engine power.

Text from the NTSB. Open the NTSB docket for ERA15LA301 for the full record.