Cessna have not made SIDS mandatory....from the manufacturer, its HIGHLY reccomended (sic). CASA have made it mandatory.
Jaz24zzk,
That is only partially correct, and CASA did nothing "special". The Cessna SID is certainly a requirement (mandatory) for any aircraft used in Part 135 ( roughly charter) in USA.
Cessna made the SID part of the Cessna MM for various aircraft, and Australian maintenance rules do not differentiate between categories of operation, so owners/operators of aircraft all are stuck with the requirement.
US rules do not take the "one size fits all" approach of Australia, to the long standing relief of private owners in the US.
Tootle pip!!