(1) Differences training consists of theoretical knowledge instruction, a theoretical knowledge examination and flight training as prescribed in Document SA-CATS 61 and is required when converting to—
(a) an aircraft within a class rating which has an additional system or additional systems, as prescribed in Document SA-CATS 61;
(b) an aircraft of a different aircraft manufacturer within a class rating; and
(c) a variant of a type as specified in the list of aircraft types published by the Director on the Authority website.
(2) Differences flight training for aircraft within a class and for all helicopters may be carried out in an aircraft or in an FSTD approved for the purpose.
(3) Differences flight training for aeroplanes of a type shall be carried out in an FSTD approved for the purpose, except when such FSTD is not available, in such case, the differences flight training shall be carried out in an aircraft.
(4) Differences training shall be conducted by an approved ATO or a foreign training organisation as specified in this Subpart.