Analysis and Prevention of Cracks in Fuel Tube Nut

Fuel tubes are the channel of metering parts of piston engine sending fuel to cylinder. Cracks in the fuel tube nut can cause fuel tube loosed, and oil leakage, leading to serious flight accident. The reasons of stress corrosion cracking of the fuel tube brass nut of Cessna172 airplane were analyzed, the normal maintenance and a series of preventive measures were put forward.