A couple of points additional to 411A's comments ..
(a) the original post does not indicate the country of certification/registration so there may be local requirements or permissions to consider. For instance, I recall long ago (and my memory may be in error a little) that, in Oz, one didn't need the markings but, if they were there, they had to be correct.
(b) for the US case currently, 23.1545(b) requires the colour coding unless 23.1545(d) applies in that the aircraft has had Vmo/Mmo determined .. then some other requirements apply. This may be the answer and, I suspect, is what 411A is referring to .... Likewise I can't see much guidance in TSO-C2d.
Last edited by john_tullamarine; 11th April 2002 at 06:51.