scc-of-titanium-alloy-in-contact-with-chlorineca. 10 cmAfter takeoff, the crew heard a very loud bang at an altitude of about 150m. Witnesseson the ground briefly saw flames and smoke escape from the tailpipe. The aircraft began to drift right and veer downward. The fan RPM of the right engine dropped offand the exhaust gas temperature increased rapidly. The pilot was able to land safelyusing the single remaining engine.Bang!Stress corrosion cracking and the fracture of a steel shaft andtitanium-alloy central vent tube due to the influence ofhydrogen and media containing chlorine during overhauling.The cause was probably degreasing and/or lacquer removalbaths containing chlorine.Low-pressure turbine shaft madefrom low-alloy steel BearingDamaged areasCentral vent tube (CVT)made from titanium alloy