What does the acronym "NDI" stand for in maintenance?

The acronym "NDI" stands for Nondestructive Inspection, which refers to a range of testing techniques used to evaluate the properties of a material, component, or assembly without causing any damage to it. This method is essential in maintenance and safety inspections, particularly in aviation and engineering, as it allows for the detection of flaws, cracks, or structural weaknesses while preserving the integrity of the inspected item. Nondestructive Inspection methods include techniques like ultrasonic testing, radiographic testing, magnetic particle testing, and dye penetrant testing, among others. These methods are critical in ensuring that aircraft and their components are safe for operation and that they meet stringent regulatory standards.