Bleed air ducts are used in aircraft to de-ice fuselage and to heat the cockpit by transferring engine heat. These ducts are made of titanium tubes and are routed in the airframe. Over long-term operation, cracks may appear in the bleed air duct tubes because of the action of moisture and corrosive gas. Therefore, we proposed an electromagnetic testing system for the nondestructive testing of bleed air duct tubes. An unmanned crack detection algorithm, which based on analysis of electromagnetic field distribution, was developed. In addition, locations of cracks in the circumferential and axial directions of the bleed air duct tube were determined.
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