Ercoupe 415 N2674H accident near South Boston, Virginia

Probable cause

The improper installation of a fuel filter screen cover gasket, which resulted in its failure, fuel starvation, and a subsequent total loss of engine power during cruise flight. Contributing to the accident was the unapproved fuel sight gauge, which obscured the pilot’s view of the fuel level in the fuel header tank.

NTSB analysis

During cruise flight, the engine lost total power and the pilot performed a forced landing to a road, during which the right wing sustained substantial damage. Subsequent examination of the engine revealed the failure of a fuel filter screen cover gasket from the fuel transfer pump, which transferred fuel from the wings to the header fuel tank. The failure allowed the fuel transfer pump to draw in air rather than fuel. Given this information, it is likely the engine consumed all the fuel in the fuel header tank, and the fuel was not replaced with fuel in the wings due to the transfer pump anomaly.

When the failed gasket was replaced with a new gasket, the engine started normally, and the fuel transfer pump operated normally. Further examination of the failed gasket revealed that the gasket was damaged, likely during installation at the most recent annual inspection about 4 months before the accident. Additionally, the sight gauge for the fuel header tank was cloudy and was an unapproved part, which obscured viewing of the fuel level in the fuel header tank and likely prevented the pilot from recognizing that the fuel was not transferring properly from the wing tanks.

Text from the NTSB. Open the NTSB docket for ERA21LA062 for the full record.