What tools can be used for mechanical verification or aerodynamic smoothness?

Mechanical verification or assessing aerodynamic smoothness of aircraft surfaces requires tools that can accurately measure and evaluate the texture and profile of those surfaces. Optical tools such as laser scanners or surface profile gauges are used to assess surface irregularities and ensure they meet specific design smoothness criteria. These tools can provide a highly detailed view of the surface, capturing variations that impact aerodynamics.

Depth gauges, meanwhile, are essential for measuring the depth of holes or recesses to ensure they meet engineering specifications, which is critical for structural integrity. Together, optical tools and depth gauges cover a broader range of measurements, ensuring both the smoothness and the precise structural requirements of aircraft surfaces are satisfied. This combination is vital in the maintenance of low observable aircraft, where aerodynamic performance and structural integrity are paramount.

The other options each suggest a limited set of tools that would not be sufficient alone for thorough verification of aerodynamic smoothness.