I received this from CASA a few days back.
I refer to your recent correspondence in which you request the Civil Aviation Safety Authority’s (CASA’s) position in relation to Cessna Supplementary Inspection Document (SID) requirements. Firstly, the concept of continuing airworthiness covers all of the processes that ensure that, at any time in their operating life, all aircraft comply with the airworthiness requirements in force and are in a condition for safe operation.
The requirement for the incorporation, or otherwise, of the Cessna SIDs in Class B aircraft is determined by the maintenance schedule elected by the Certificate of Registration holder, not by the category of operation. It is well recognised, however, that many operators in aerial work and in private category, have elected to use the CASA maintenance schedule (schedule 5). In this regard I confirm that there is nothing in Civil Aviation Regulation (CAR) 42B that specifically mandates compliance with, or incorporation of, a Cessna SID in this maintenance schedule.
While there is nothing in Schedule 5 to the CAR which expressly calls up the manufacturer’s inspection or other requirements, however, paragraph 2.7 of Schedule 5 notes that, where a thing is required to be inspected under the Schedule, the inspection is to be a thorough check to determine whether the thing will continue to be airworthy until the next inspection.
CAR 42V requires persons undertaking maintenance (including inspection) to do so in accordance with applicable maintenance data. CAR 2A(2)© defines such data to include instructions issued by manufacturers of aircraft, components and materials.
In CASA’s view, SIDs are manufacturer’s instructions which, for the purposes of maintaining the continuing airworthiness of an aircraft, must be considered by the Certificate of Registration holder and if applicable to their aircraft, complied with regardless of the schedule under which the aircraft is maintained.
Mike HigginsManager Continuing AirworthinessAirworthiness & Engineering Branch
Standards DivisionCivil Aviation Safety Authority
There will be more on this and as ruffasguts says...Alot of old Cesnas will be scrapped.