Skills

Dang It! uses the stock experience system to check if a kerbal is able to perform maintenance operations on a part.

By default, all parts require an engineer trained to a certain degree of skill (although the required skill can be customized in the MM patches).

For example, engines require a level 3 engineer to be repaired, maintained and inspected:

PerksRequirementName = Engineer
PerksRequirementValue = 3

Make sure you have enough skilled engineers, and keep them safe: they are invaluable for long missions!