Frank,
the reference is in the AC:
6.1 Instrument number CASA EX10/10 ‘Exemption — Display of markings and
carriage of identification plates’ allows Australian fixed wing and rotorcraft with a
maximum take off weight below 5700 kg and operating wholly within Australian territory to
be exempt from some of the requirements of CASR Part 45 that cover the location and size
of markings and the carrying of an aircraft registration identification plate.
6.2 Under the terms of the exemption, applicable aircraft will be exempt from:
• displaying markings on the under surface of the wings as required by CASR
45.045(1);
• displaying lateral markings of 300 mm as required by CASR 45.065(3)(b)(ii) and
© item 1 — under the terms of the exemption the minimum height is 150 mm; and AC 45-01(2): Nationality and Registration Marks 3
Revised: March 2010
• carrying an aircraft registration identification plate as required by CASR 45.145(1),
provided the aircraft carries a fireproof manufacturer’s data plate as required by
CASR 21.820. See Section 9.3 ‘Aircraft Registration Identification Plate’ for an
explanation of the term ‘fireproof’.
Cheers