Look at the underside of the wings Bill. Every Canadian airplane has large letters that must 19.5" high. You can usually make out an aircraft's mark clearly from the ground at 600 or 700 feet AGL.
Many a student has been busted at our airport for flying outside the noise abatement corridor by homeowners on the ground looking up and recording the aircraft's mark.
This is the regulation:
Specifications for the Letters in the Marks Displayed on Aircraft
(2) The letters in the marks displayed on an aircraft shall meet the following specifications:
(a) be of equal height;
(b) subject to subsections (c) and (d), the height of each letter in the marks displayed on a heavier-than-air aircraft shall be not less than 15 cm (5.9 inches);
(c) the height of each letter in the marks displayed on the bottom surface of a wing of a heavier-than-air aircraft shall be not less than 50 cm (19.68 inches);
(d) the height of each letter in the marks displayed on the bottom surface of the fuselage or cabin of a rotorcraft shall be the lesser of
(i) 50 cm (19.68 inches), and
(ii) four fifths of the width of the fuselage or cabin;
(e) the height of each letter in the marks displayed on a lighter-than-air aircraft shall be not less than 50 cm (19.68 inches);
(f) the width of each letter in the marks displayed on an aircraft, other than the letters "I", "M" and "W", shall be two thirds of the letter's height;
(g) the width of the letter "I" in the marks displayed on an aircraft shall be one sixth of the letter's height;
(h) the width of the letter "M" or "W" in the marks displayed on an aircraft shall not exceed the letter's height;
(i) the length of a hyphen in the marks displayed on an aircraft shall be two thirds of the height of any letter in the marks;
(j) the thickness of the lines of a letter or hyphen in the marks displayed on an aircraft shall be one sixth of the height of any letter in the marks;
(k) the letters in the marks displayed on an aircraft shall be displayed adjacent to each other in a series;
(l) adjacent letters in the marks displayed on an aircraft shall be separated by a space that is not less than one quarter of the width of the letter "C" in the marks;
(m) a letter in the marks displayed on an aircraft that is adjacent to a hyphen shall be separated from the hyphen by a space that is not less than one quarter of the width of the letter "C" in the marks;
Gee, I imported mine 5 years ago. I certainly didn't need, nor do I have letters under the wings,,
