Leerjet 35/36 Developed for Training Purposes 2B-87
December 1998
Expanded Normal Procedures
Deicing
When necessary, use the following methods to deice the air-
craft:
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placing the aircraft in a warm hangar until the ice melts
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mechanically brushing the snow or ice off with brooms,
brushes, or other means
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applying a heated water/glycol solution (one-step proce-
dure)
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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.
Many factors influence snow, ice, and frost accumulation and
the effectiveness of deicing fluids. These factors include:
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ambient temperature and aircraft surface temperature
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relative humidity, precipitation type, and rate
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wind velocity and direction
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operation on snow, slush, or wet surfaces
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operation near other aircraft, equipment, and buildings
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presence of deicing fluid and its type, dilution strength,
and application method.
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