The Dirty Dozen concept was developed by Gordon Dupond in 1993 and refers to the twelve most common preconditions for human error or conditions that can act as precursors to accidents or incidents. These twelve elements influence people to make mistakes. Dupont developed the concept while working for Transport Canada, it was part of a basic training program for human factors in maintenance. Since then, it has become the foundation of training courses for human factors in maintenance around the world.

Awareness that a risk exists is the first step in limiting its potential to expand and lead to adverse scenarios.

It should be noted that this is not an exhaustive list of preconditions for human error, ICAO Circular 240-AN / 144 lists more than 300. But since 1993, in all areas of the aviation industry, not only in the field of aircraft maintenance, this list has become established as a foundation for discussions of human error within companies, organizations, and in the workplace. Therefore, it is possible to find Dirty Dozen lists for pilots, ramp workers, air traffic controllers and cabin crew.

In the light of the current situation, we have supplemented the list in such a way that it summarizes the new risks and possible ways to mitigate them. You are invited to view it and use it in your training and daily operations.

The document can be found here.