Advances in Science and Technology Vol. 119

Abstract: During a routine overhaul of an aero engine, a joint of the fuel transmitting pipe was observed leaked. To investigate the cause (s), failed transmission pipe was subjected to detailed investigations utilizing multiple testing techniques to find out the root cause (s) such as radiography, dye penetration testing, optical microscopy, scanning electron microscopy and energy dispersive spectroscopy. It was identified that the welding defects i.e., lack of fusion caused initiation and propagation of the subsurface fatigue cracks under vibrational condition of the aircraft. When the crack length reached a threshold level, it resulted in fuel leakage.