CESSN A SECTION 8
MODEL
2088 (675 SHP)HANDLING, SERVICE, AND MAINTENANCE
GROUND DEICEIANTI-ICE OPERATIONS
(Continued)
Deicing may be accomplished using the ambient temperature available
from a heated hangar or by mechanical means using a glycol-based
Freezing Point Depressant (FPD) Type I fluid. A heated hangar is an
excellent option to deice
air~lanes and should be utilized whenever
posslble Care must be
exercised
however, to ensure that all melted
prec~pltation
IS
removed from the alrplane to prevent refreezlnq once
the
&plane is moved from the hangar to the flight line. Type I deicing
fluids should be sprayed on the airplane (with engine shutdown) in a
manner which minimizes heat loss of fluid to the air. The fluid should be
applied in a temperature range from 160°F to 180°F (71°C to 82°C)
using a solid cone pattern of large coarse droplets. Fluid should be
sprayed as close as possible to the airplane surfaces, but not closer
than approximately 10 feet if a high pressure
nozzle is used.
I
Application techniques for Type II, Type Ill and Type IV fluids are the
same as Type
I,
except that since the airplane is already clean, the
application should last only long enough to properly coat the airplane
surfaces. Type
II. Type Ill or Type IVfluid is however sometimes heated
and sprayed as a deicing fluid. For this case, it should be considered a
Type I fluid, as the heat may change the characteristics of the
1
thickening agents in the fluid. Type II, Type Ill or Type IV fluid therefore,
applied in this manner, will not be as effective as it would be if it were
applied at ambient temperature.
Refer to Figure
8-1 for areas to spray Type
I
deicing fluid, Figure 8-2 for
I
areas to spray Type
II,
Type Ill and Type IV anti-icing fluid, Figure 8-3
for areas to avoid spraying directly, and Figure 8-4 for sequence of
application. Heated solutions of FPD are more effective than unheated
solutions because thermal energy is used to melt the ice, snow, or frost
formations. Type
I
deicing fluids are used in the diluted state, with
*,
specific ratios of fluid-to-water dependent on ambient temperature.
Type
I
deicing fluids have a very limited holdover time (refer to FSAT
I.
1
05-02, dated 10-1 8-05 or later.
(Continued Next Page)
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1
Revision 23
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U.S.
8-29
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