Part II - Aircraft Identification and Registration and Operation of a Leased Aircraft by a Non-registered Owner
Canadian Aviation Regulations 2010-2
Standard 222 - Aircraft Marking and Registration Standards
Content last revised: 2005/12/01
DIVISION I - AIRCRAFT MARKS
222.01 Specifications for Marks
(h) the display of marks on the bottom surface of the wings is optional,
(i) where the marks are displayed and the aircraft has one set of wings, the marks shall be placed once on the bottom surface of the wings or, where the aircraft has more than one set of wings, once on the bottom surface of the lowest wings
(A) extending from wing tip to wing tip or on the left wing only,
(B) equidistant, to the extent possible, from the leading and the trailing edges, and
(C) with the letters arranged with their tops toward the leading edge; or
(i) where the marks are not displayed on the bottom surface of the wings, the height of the marks that are displayed on the side surfaces in accordance with subsection (g) shall be displayed in accordance 222.01(2)(o).