Classification society does not issue any plan, they just approve it or endorse it. So if there is any change in the fire plan, it is the duty of the shipowners (and master) to present the new fire plan to the classification society for approval and endorsement.
Now the question is how to amend the
I have written couple of blog posts on checks and testing of Lifeboats. Please check this out.
These may answer your question. If there is anything more you may req