Chapter 5 - Ground Crew Supplement

One-step Deicing/Anti-icing

65.  Generally, in Canada the use of a one step process suggests that there isn't any active precipitation occurring at the time of deicing. However, in Europe the one step method is used with Type II & Type IV anti-icing fluids in a diluted and heated state, and applied with a specialized nozzle. Also, in Canada's Northern communities, given the extremely low temperatures, the only fluid option has been the Type I fluids, and a one step procedure is sometimes used despite the associated short Hold Over Times.

66.  The thickened fluids, Types II, III & IV, should not be used unheated on an aircraft contaminated with any snow ice or frost. The aircraft surfaces must first be cleaned before application of an unheated fluid Two-step Deicing/Anti-icing.