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Trichloroethylene: This is a very effective method which removes paint and grease; it ts
toxic and otherwise dangerous to perscmmel usingit.
Cleaning Compound (Gunk)~Kerosene and Steam: The cleaning compound was mixed with
kerosene in a 4 to 1 ratio, was applied by spray, and then was removed by steam. The amount
of ofl and grease removed was less than that removed by kerosene and water; the use of steam
around the ignition syatem precluded a thorough steaming.
Liquid Soap and Water Under Pressure: This method was applied by mixing soap and water
in a standard Army decontamination vehic'e (400 gal), applying under pressure, and following
by a rinse of fresh water under pressure. The method was effective on all dirt but did not
thoroughly remove grease and oil.
F.8.4
Precontamination and Predecontamination Requirements
The following requirements should be adhered to before entering contaminated areas and
when attempting to decontaminate helicopters.
1. Prior cleaning and waxing of the helicopter will tend to hold contar ination to a minimum.
2. Seats used by per::onnel entering and departing contaminated areas should be of a nonporous material or covered by disposable material.
3. The deck areas should be smooth surfaces which can readily be vacuum cleaned, or
may be covered with a disposable material.
4. Bootees or shoes and gloves worn in contaminated areas must be remove-l and discarded before entering the helicopter.
5. Radio and baggage compartments should be sealed to prevert dust and water from
entering.
6. Competent helicopter personnel should be employed to prepare the helicopter and to
direct decontamination.
%. Componert replacement pzrts should be available to replace items which become internally contaminated and are impossible to clean in the field.
8. All parts that require greasing should be greased before and after the decontamination
process.
9. For shipboard decontamination a large square section of painted canvas raised along
the edges by sandbags to form a hollow square with one corner dvaining into scuppers may be
used as a decontamination area.
10. For land-based decontamination an area of concrete with a drain in the center may be
employed,
11. The use of salt water is not feasible on helicopters.
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F.5.5
It is noted that kerosene and water on the engine and Tide slurry and water and steam on
all the other components produce a very good slope of reduction in contamination.
It is noted that liquid soap and water applied under pressure and pressure rinsed znd even
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Tide slurry and water reduced the contamination to not below 10 mr/hr. This ts probably because the contamination is internal and impossible to reach with the methods used and without
taking the components apart piece by riece. This is a time-consuming project andis not feasibie if a high availability rate is to be maintained while operating in contaminated areas.
It {s further noted that the main rotor-blade tips are contaminated owing to the drain holes
and cannot be reduced by any of the methods used. The steam method cannot be employed because of factory limitations on washing the blades with nothing stronger than a mild soap and
water, owing to the bording process used in their construction. The leading edges of the blaies
were pitted, and it was assumed that emery cloth would smocth these pits and reduce the con-
tamination; this was not true.
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Conclusions