# What is the difference between iSpec2200 and S1000D specifications?

I know the iSpec2200 and S1000D are the specifications which are used in the aircraft maintenance manual, I have to know how they actually work in the aviation domain and what is the difference between them.

• I'm not doubting you, but I am surprised that an organization went from iSpec<something> to just <something> in its naming convention. I mean, dropping the "lowercase 'i', uppercase word" thing in the internet age? Whoda thunk it?? (Unless, of course, Apple sued...) Also, it's odd that they went from the numeric 2200 "backwards" to 1000. Everything about those two identifiers indicates (to me, at least) that iSpec2200 is newer than S1000D. – FreeMan Dec 5 '19 at 19:37