roundsounds, the s15AA of the Acts Interpretation Act means that clauses are interpreted in light of s3 of the Civil Aviation Act 1988 (plus any other declarations of purpose, such as ministerial second reading speeches, etc).
viz.,
The main object of this Act is to establish a regulatory framework for maintaining, enhancing and promoting the safety of civil aviation, with particular emphasis on preventing aviation accidents and incidents.
(I am not a lawyer.)