RiggaNot familiar with "SID"s - are they Service Information Digests?
Little background for you Rigga, SID's where brought about by Cessna who never envisaged the likes of a Cessna twin still flogging around the skies after 40 years, they expected them to have an initial life of about 15 to 20 years if memory serves me right.........
What Cessna did was to buy back some high houred Aircraft, strip and inspect them and come up with a maintainance requirement based on what they found to keep them Airworthy and these were more or less Mandatory to comply with. the links below will help you inderstand them Rigga and what is involved ( A lot ) Australian links.
http://www.casa.gov.au/airworth/info/CessnaSIDs.pdf
http://twin.cessna.org/reference/ces...2sid_paper.pdf