In this video, Hal discusses D-160 - Environmental Conditions and Test Procedures
 
So what is DO-160? It’s  a specification developed by the radio technical commission for Aeronautics, describing a series environmental qualification tests for aerospace equipment. Basically it’s a way for us to prove that anything being installed in an airplane will be able to keep up with the harsh environments that equipment in an airplane might see. The specifications divided into sections for instance, temperature testing is covered in sections four and five radiofrequency susceptibility is covered in section 20… that sort of a thing. Each set of tests is divided into various levels of severity, that way we don’t end up testing an entertainment center the same way that we would test a primary flight display and vice versa. At the end of the day DO-160 is really just an abusive harsh sometimes destructive set of tests that we perform in the name of safety.