Ha, agreed.
Cirrus are the new Barron-Cessna 210.
Brainy. The Reg's quite explicitly lay down the manufacturers data is to be followed, along with Component overhaul requirements.
Within the SB referred to, it states in black and white, that Mags MUST....
If the Reg's are the first port of call. To me It goes something like this.
CASA Reg.
Aircraft maintenance Data is to be used for Maintenance.
Components must have a overhaul period.
In the MM, there will be a component overhaul schedule.
If not, you revert to the component manufacturer overhaul schedule.
In black and white, there are overhaul and inspection periods.
The Reg's say you must follow the Data, as its a CASA directive to follow the data, you then must follow the periods set out in the Data, especially when preceded by the word MUST.
This is how our surveyers and Reps state it.
This is also how I see it.
There is copious amounts of waffle and ambiguity within all of the common law pages, CASA Reg's, and advisories, but one thing that shines through is IF you are aware of overhaul periods, and there is not an explicit AD (AD/Eng4/AII) (ADProp/1) to allow an over run, then, as there is nothing saying you don't have to abide by the component periods, they must be adhered to.