The current 737 (all series) Vol 1 SP.16.5 states:
-“Wing Anti–Ice Operation–On the Ground
Wing anti–ice must be ON during all ground operations between engine start and takeoff, when icing conditions exist or are anticipated, unless the airplane is protected by the application of Type II or Type IV fluid in compliance with an approved ground de–icing program.
WARNING: Ground use of the wing anti–ice system is intended to complement, and not replace, ground de–icing/anti–icing and inspection procedures. Close inspection is still required to ensure that no frost, snow or ice is adhering to the wing, leading edge devices, stabilizer, control surfaces, or other critical airplane components at takeoff.”
I don’t think there is any grey area here. If your company has an SOP which is contrary to the above perhaps you should mention it to your fleet manager.
In
our B737NG FCOM Vol 1 SP.16.5 it is stated:
"Wing anti-ice operation on ground before takeoff is NOT X (X=our company) approved procedure.
WARNING: Use of wing anti-ice system during ground operation before takeoff is not approved.
Close inspection is required to ensure that no frost, snow or ice is adhering to the wing, leading edge devices, stabilizer, control surfaces, or other critical airplane components at takeoff.
The airplane shall be treated in accordance with the de-/anti-icing procedure."