Visual inspection using a borescope - a clean surface on the left and a surface with corrosion damage on the right.
Visual inspection is the most basic and common inspection method, and involves getting the inspector to "see" where one normally couldn't. This is done with the use of tools such as fiberscopes, borescopes, magnifying glasses and mirrors. Successful use of the technique requires good lighting and vision for best sensitivity, as well as training & experience which are vital for accurate interpretation of features.
Advantages of Visual Inspection
- Inspection performed rapidly and at low cost
- Ability to inspect complex sizes and shapes of any material
- Minimum part preparation required
Limitations of Visual Inspection
- Surface too be inspected must somehow be accessible to inspector or visual aids
- Surface finish, roughness and cleanliness can interfere with inspection
- Only surface defects are detectable
Visual inspection of an airplane engine with an articulating fiberscope.