The size and position of registration marks on aircraft in G.B. is set out
in CAP 523.
Para. 2(b) (iv) states that if neither authorised surface (i.e. the side of
the fin or the space on the side of the fuselage between the wing and the
tailplane) is large enough for marks to be 30 cms. in height (whilst leaving
a margin of at least 5 cms along each side of the vertical tail surface if
mounted on the fin) marks of the greatest height practicable in the
circumstances shall be displayed on the larger of the two surfaces.
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