From the CAAP's On Class B maintenance.
IMPORTANT
This publication describes the preferred
method of complying with the directions
given under regulations 41, 42A, 42B,
42C and 42ZE of the CARs.
The information in this publication is advisory only. The Civil Aviation Regulations
set out the legal requirements that must be complied with in relation to the
subject matter of this publication. There may be a number of ways of ensuring
that the requirements of the CARs are met.
This publication sets out the method that is preferred and which experience has shown should, in the majority of cases, ensure compliance with the regulations. However, before using the information in this publication the user should always read the CARs listed in the reference section below to ensure compliance with the legal obligations of the CARs.
I did not find a CAAP on spark plugs!