Non-destructive testing are methods used to do inspections on aircraft structures, components and materials for various defects that are not visible to a naked eye. The purpose is to ensure safety of the aircraft is guaranteed when it is flying in the air. This process is part of the undergoing c-check on one of our Dash 8-100s.
![](https://i.ytimg.com/vi/tSCDch99QAs/maxresdefault.jpg)