Equally likely, in my opinion, is the fact that submarine maintenance and operations
personnel are required to comply with detailed procedures (which include post
maintenance tests and instructions for returning the system to a “ready to operate
condition”) in performance of repairs and to conduct in-service preventive maintenance
of all types. The result is that they “fix it right the first time.”
At the upper end of the procedure hierarchy are “Controlled Work Procedures.” These
were introduced for nuclear submarines in the 1970’s and for surface warships in the
1980’s