Commonwealth Consolidated Regulations Commonwealth Consolidated Regulations(1) A type certificate for an aircraft, aircraft engine or propeller ceases to apply to an aircraft, aircraft engine or propeller of that type if:
(a) a change is made in the design configuration, power, power limitations (engines), speed limitations (engines), or weight of the aircraft, aircraft engine or propeller that is so extensive that a substantially complete investigation of compliance with the requirements applicable under regulation 21.017 is necessary in the interests of aviation safety; or
(b) in the case of a normal, utility, acrobatic, commuter or transport category aircraft, a change is made:
(i) in the number of its engines or rotors; or
(ii) to engines or rotors using different principles of propulsion or to rotors using different principles of operation; or
(c) in the case of an aircraft engine--a change is made in the principle of operation; or
(d) in the case of propellers--a change is made in the number of blades or principle of pitch change operation.
(2) A person who proposes to make a change mentioned in subregulation (1) may apply to CASA for a new type certificate for the aircraft, aircraft engine or propeller.
Source FARs section 21.19 modified.