This is not an official version (but it is an accurate copy of what appeared on the CASA website).
55A Change to flight manual may be approved
(1) The holder of the certificate of registration for an Australian
aircraft, or a person acting on behalf of the holder, may apply,
in writing, to CASA to approve a change to the flight manual
for the aircraft (other than a change of a kind mentioned in
subregulation 55 (1), (2), (3) or (4)).
(2) CASA may, on receiving an application made under
subregulation (1), approve the change.
(3) In deciding whether to approve the change, CASA must take
into account any relevant considerations relating to the interests
of the safety of air navigation.
Note
A change to a flight manual that is approved under this regulation canbe in the form of a flight manual supplement that includes the instruction to
make the change.