In some maintenance organizations, the procedures get updated in response to some error or special circumstance. Over time, what started as a three-page procedure gets bloated to a 30-page monstrosity that nobody reads. All the tips, specs, warnings, background information, tutorials, and additional steps that seemed too important to leave out have made the procedure useless.
Even procedures not subject to this information bloat tend to be too thick. How thick is too thick? Just observe people in the field. If they do anything other than follow the procedure step by step, then it’s too big. If they flip through pages to get through it rather than read those pages, the problem is the procedure, not the person it was presumably written for.
You may be using procedures to substitute for training and not even know that. To see if you are, look at the level of detail. Is it appropriate for a person who is trained to perform the task in question?