Static,
My company's tech pilot referred to the same text as Ron quoted:
"Wing anti-ice must be ON during all ground operations between engine start and takeoff, when icing conditions exist or are anticipated."
BUT with the following added:
"If deicing fluids types II or IV are used WAI may be left off"
So for us the procedure is :
Icing conditions NOT deiced: WAI on
Icing conditions and deiced: WAI off
ref: Boeing 737-800 AOM Supplementary procedures, SP 16.5.
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