![]() Inspect skin for wrinkles throughout a large area.Remove all dirt, grease, and paint from the damaged and surrounding areas to determine the exact condition of each rivet, bolt, and weld.When investigating damage, proceed as follows: Some of the defects found by NDI include corrosion, pitting, heat/stress cracks, and discontinuity of metals. A trained and experienced technician can detect flaws or defects with a high degree of accuracy and reliability. NDI methods serve as tools of prevention that allow defects to be detected before they develop into serious or hazardous failures. Nondestructive inspection methods (NDI) are used as required when inspecting damage. Check all skin, dents, and wrinkles for any cracks or abrasions. Wrinkled skin, elongated or damaged bolt or rivet holes, or distortion of members usually appears in the immediate area of such damage, and any one of these conditions calls for a close inspection of the adjacent area. When any component or group of components has been damaged, it is essential that both the damaged members and the attaching structure be investigated, since the damaging force may have been transmitted over a large area, sometimes quite remote from the point of original damage. ![]() When investigating damage to an aircraft, it is necessary to make an extensive inspection of the structure. The inspection includes an estimate of the best type and shape of repair patch to use the type, size, and number of rivets needed and the strength, thickness, and kind of material required to make the repaired member no heavier (or only slightly heavier) and just as strong as the original. The function of any damaged part must be carefully determined to ensure the repair meets the requirements.Īn inspection of the damage and accurate estimate of the type of repair required are the most important steps in repairing structural damage. For example, fuel tanks and floats must be protected against leakage cowlings, fairings, and similar parts must have such properties as neat appearance, streamlined shape, and accessibility. Strength may be the principal requirement in the repair of certain structures, while others may need entirely different qualities. When repair of a damaged part is possible, first study the part carefully to fully understand its purpose or function. Very often, replacement is the only way this can be done effectively. The primary objective of aircraft repair is to restore damaged parts to their original condition. Aircraft structural members are designed to perform a specific function or to serve a definite purpose.
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