2.2 Fluids
There are four standard aircraft deicing and anti-icing fluids:
− Type I deicing fluid can be used to quickly melt and remove frost or other ice formations.
As these are the thinnest of the fluids, as airflow increases over the surface, the fluid is
easily blown off the surface. Type I fluid has a very limited Holdover Time (HOT). Type I
fluid is usually dyed orange
− Type II and IV anti-icing fluids prevent snow, ice or frost contamination from adhering to
the aircraft surfaces. These fluids are thicker, remain on the surface longer and have a
longer HOT. Type II fluid is clear and Type IV fluid is dyed green
− Type III anti-icing fluid is thicker and has a longer HOT than Type I fluid. It will shear and
blow off the surface at a lower speed than Type II and Type IV fluids. Type III fluid is
usually dyed bright yellow.
3 Inspections
It is recommended that operators who use Type II, III or IV anti-icing fluids do periodic visual
inspections for anti-icing fluid residues.
Visual inspections for fluid residue must be done in these areas:
− Along the wing rear spar with flaps extended
− Around the perimeter of the aileron surface and around the aileron tab
− Gaps around the elevator and elevator tab
− Gaps around the rudder and the rudder tab.
Any identified residue must be removed by cleaning with warm water or an approved fluid.
The operator must determine the frequency of the visual inspections as follows:
− Based on findings of residue in previous visual inspections
− After a maximum of three applications of Type II, III or IV anti-icing fluids.
If the aircraft is washed, or if Type I fluid is used for deicing, the frequency of the visual
inspection may be reduced.
4 Before Engine Start
It is recommended that deicing / anti-icing is done with the engine shut down.
Section 2 - Aircraft Servicing
Ground Servicing Guide Report No: 02527
Issue date: Dec 19, 2022
Page 2-8-2
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