This is the latest version of the official SSN Manual of procedures.
Any changes are only made by the SSN.
Actually this new Manual of Procedures is compiled by Hans Wiehahn from AVConsult.
The NCAA defines an MoP as such:
Manual of Procedure
-> An ARO MoP is the key document for an ARO to show its ability to effectively administer its area of responsibility.
-> ARO is responsible for the preparation and maintenance of manuals describing standards and procedures for all operations under their control.
-> Operational and other manuals are to be regularly updated to provide for a changing environment and continuous improvement in safety outcomes.
-> All aviation safety changes to manuals are approved by NCAA
-> NCAA remains ultimately responsible for aviation safety.
-> NCAA may also require that certain material be inserted into the manual if a change does not reach an outcome acceptable to the Executive Director.