TM 1-1500-204-23-1
(13)
Inspect hydraulic accumulators, landing
gear struts, and tires for proper inflation. Air pressures
will drop due to a temperature drop.
NOTE
Exposure
of
aircraft
to
low
temperatures will cause contraction
of metals and hardening of rubber
seals. Frequent inspections for
leakage
and
looseness
of
connections is necessary to prevent
leakage.
d.
Anti-Icing, Deicing, and Defrosting. A protective
coating of unheated, undiluted, anti-icing and deicing-
defrosting fluid will prevent frozen accumulations from
forming on aircraft surfaces if applied before freezing
conditions begin and as often as necessary during the
precipitation. Any frost or thin layer of ice that does
form can be removed easily by application of additional
fluid. A protective coating of fluid applied before
installation of covers will permit easy removal with a
minimum sticking of covers.
WARNING
When handling and applying glycol-
water products, wear eye, hand, and
body protection. Avoid Inhaling
vapors and skin contact. Follow
Material
Safety
Data
Sheet
procedures for individual product
use Injury may otherwise result.
(1)
Types of fluid Anti-icing, deicing, and
defrosting fluid characteristics are explained in the
following paragraphs.
(a)
Ethylene/propylene glycol. Anti-
icing and deicing-defrosting fluid, specification MIL-A-
8243B, is basically a mixture of ethylene glycol and
propylene glycol and Is recommended for preventing
formation and removing deposits of frost, ice, and snow
on
exterior
aircraft
surfaces
on
the
ground
in
temperatures ranging from -65 to 32 °F (-54 to 0°C).
Ethylene glycol and propylene glycol are formulated with
intrinsic corrosion Inhibitor, as prescribed In MIL-A-
8243B.
(b)
Glycol-water. Glycol-water anti-
icing and deicing-defrosting fluids, including MIL-A-8243
anti-Icing fluid, are not recommended for use around
aircraft electronic equipment which employs silver or
silver coated electrical/electronic circuitry.
WARNING
Rapid oxidation and fire can occur
when glyco-water solutions come in
contact with a short across bare or
defective insulated silver or silver-
coated electrical circuits such as
wiring, switches, and circuit breakers
which carry positive direct current
(dc), such as electronic black boxes.
NOTE
The fluid shall be homogenous and
free of sediment and abrasive. A
slight waxy separation in the fluid
shall be no cause for rejection if the
separation is dispersable by several
seconds of moderate agitation Fluid
shall remain dispersed for at least 24
hours.
(2)
Fluid application. The following
paragraphs describe methods and equipment used to
apply antiicing, deicing, and defrosting fluids.
WARNING
Special care must be taken by
personnel to prevent slipping and
falling
when
walking
on
wing
surfaces coated with deicing fluid.
Otherwise death or injury may
result.
(a) Spray method. If hangars,
covers, or equipment for heating fluid-water solutions
are unavailable, the preventive spray method will be
used to maintain standby and alert aircraft in a state of
readiness. The preventive spray method Is application
of cold, undiluted fluid on surface to be protected in a
quantity to wet the area thoroughly without excessive
drainage
(b) Spray pattern. Suitable spray
equipment should be used, as application of fluid is
done best by spraying surfaces. Spray should not be
applied in a solid stream, but be fine enough to prevent
waste. A fanshaped pattern is recommended
(c) Spray equipment. Cleaning or
other decontaminating equipment may be modified to
spray deicing fluids. Spray guns on this equipment can
be used as they are, but better spray coverage can be
obtained if they are modified slightly. A common
garden hose nozzle will give satisfactory result In
accumulation removal if the solid stream is used. This
nozzle also can be used to apply a protective coating of
fluid if a fine conical spray is used.
10-3
