SEP maintenance docs
 

Excuse my ignorance but just checking my understanding (pilot rather than engineer) of current associated docs after being a member of a syndicate that others have organised to date. Is this correct for a SEP (example say 172):

The ARC is valid for 12 months. A Certificate of Maintenance Review to be carried out at 50hrs, 2nd 50hrs and 150hrs. Once all complete a Certificate of Release to Service will be issued. What is the procedure for non-routine maintenance?