This contradicts what is written on Hattrick's article on split wing and other info I have received. Hattrick specifically states it is NOT a missing feather, but rather a split in the direction of the feathers.
http://www.hattricksilkies.net/articles_split_wing.html
Okay...I am quoting here directly from the American Poultry Association's Standard of Perfection:
"SPLIT WING: One in which there is a distinct gap between the primary and secondary feathers, resulting from the permanent absence of a feather, (fig. 33), a disqualification (pg. 33). Note -- Permanent absence of a feather is determined by absence of the feather follicle." (Page 12)
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