Army Aircraft Icing
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experience accumulations of ice, use (keep) rotor head cover in place, protecting
head and controls. A low-pressure handheld pump (like a garden sprayer) may be
used to spray windshield wiper solution methyl alcohol or deice solution. Start at
the root end of the blade and work outward. It is desirable to work fluid under the
ice, and allow it to travel down the (drooping) blade to the tip. This will provide
the most effective removal of the ice. Cautions for use of alcohol products should
be observed.
d. OH-58-C: TM 55-1520-228-23-1, paragraphs 1-15 through 1-20, give
instructions for ice removal and cleaning. Deice fluid should be treated like
cleaning liquids described in these paragraphs. No contact with sensitive surfaces
should occur.
e. OH-58-D: TM 55-1520-248, paragraph 1-4-10, gives instructions for
shaking blades to remove ice. Spray of deicing fluid is permitted with (per TM 1-
1500-204-23) low-pressure spray or wiping. Aircraft should be watched to ensure
immediate wipe-up of melting ice and deicing fluid before it melts and comes
into contact with other surfaces. Caution: Read all cautions and instructions. A
wide range of damage may result from improper use. Avionics and optics on the
OH-58-D are particularly susceptible to damage during this process. Protect them
with physical barriers as needed. Do not use alcohol-based solutions on these
blades.
f. UH-1: No manual instructions are available. Limited application by
hand with a clean saturated cloth as described for the AH-64 is permitted.
Application of deice fluid with a low-pressure handheld spray pump as described
for AH-1 should be limited.
g. UH-60: TM-1-1500-237-23-1, paragraph 1.15.6 and TM 1-1500-237-
10 discuss use of the blade deicing system. Aircraft may utilize wipe or low-
pressure spray application of deice fluids to rotor blade surface following the
guidance in TM-1-1500-204-23-1 and these instructions. Caution: No bearings,
electrical connectors, plastic or elastomeric components should come in contact
with the deice fluid.
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