TM 1-1510-223-10
(f) Do not extend flaps during extended
operation in icing conditions. Operations with flaps
extended can result in a reduced angle-of-attack, with the
possibility of ice forming on the upper surface further aft
on the wing than normal, possibly aft of the protected area.
(g) If the flaps are extended, do not retract
them until the airframe is clear of ice.
(h) Report these weather conditions to air
traffic control.
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