6-20 Developed for Training Purposes Leerjet 35/36
February 1998
CAE SimuFlite
Deicing
When necessary, use the following methods to deice the air-
craft:
Q
placing the aircraft in a warm hangar until the ice melts
Q
mechanically brushing the snow or ice off with brooms,
brushes, or other means
Q
applying a heated water/glycol solution (one-step proce-
dure)
Q
applying heated water followed by an undiluted glycol-
based fluid (two-step procedure).
Deicing Fluids
Two types of anti-icing/deicing fluids are in commercial use:
SAE/ISO Types I and II/IV. Type I fluids are used generally in
North America. Type II/IV fluids, also referred to as AEA Type
II/IV, are used generally in Europe.
Type I fluids are unthickened glycol-based fluids that are usu-
ally diluted with water and applied hot; they provide limited
holdover time.
Type II/IV fluids are thickened glycol-based fluids that are usu-
ally applied cold on a deiced aircraft; they provide longer hold-
over times than Type I fluids.
NOTE: Holdover time is the estimated time that an anti-
icing/ deicing fluid protects a treated surface from ice or
frost formation.
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