TO 35-1-3 - Robins Air Force Base

TO 35-1-3
removal and surface treatment and TO 1-1-8 for complete
paint removal and replacement of protective finishes.
• Ensure the parts are below the water seal. Do not
allow the basket or parts to rest on the bottom of
the tank.
• Do not intermingle ferrous and nonferrous metal
parts in the same immersion tank of carbon remover
or other cleaning compounds as corrosion will
likely occur.
2.1.11.3 Close the lid of the tank and allow the parts to soak
approximately two hours, depending on the hardness and
extent of the deposits to be removed.
2.1.11.4 Raise the parts slowly, permitting the parts to come
in contact with the upper layer for approximately 30 seconds,
then remove from the tank.
2.1.11.5 Rinse parts with hot water under pressure and allow
to dry. When heated water is not ready available, cold water
may be used. However, longer rinsing is required with cold
water than heated water.
2.1.11.6 If the SAE-AMS-19853 cleaning compound is not
available, MIL-PRF-87937, Type I is capable of removing carbon.
Use it in a concentration of two parts water to one part
cleaner at ambient temperatures in the tank. Do not allow parts
to remain immersed in the MIL-PRF-87937, Type I for more
than four hours without removal and inspecting the parts for
cleanliness. For heavy carbon deposits 16-hour total immersion
may be necessary. After immersion, rinse with clean
water.
2.2 MECHANICAL CLEANING.
NOTE
Do not blast valve stems or precision-machined parts.
All oil ports, passages and coolant passages shall be
taped or plugged to prevent grit or beads from entering.
2.2.1 General Information. For the purposes of this TO,
mechanical cleaning consists of sanding, grinding, wire brushing
of the repair areas only or general scuff sanding only. For
complete SE chemical or mechanical depainting and/or corrosion
removal using medium pressure water blasting, abrasive
media blasting operations to remove coatings and corrosion
refer to TO 1-1-691 for information for advanced corrosion
2.2.2 Coating Removal on Composite Surfaces.
Paints may contain toxic materials such as chromates,
barium, strontium, or lead. Use goggles, gloves, and
cartridge respirator during mechanical cleaning of
painted surfaces. Hearing protection and air respirator
shall be worn during plastic media blasting operations
as directed by local bioenvironmental engineer.
Contact the local safety and health office for proper
personal protection equipment (PPE).
• SE personnel assigned to coating removal tasks
must be specifically trained for the function to
which they are assigned such as, the use of chemical
paint removers, abrasive blasting materials and
processes, powered tools, and damage limitations.
Inadequate training will lead to further damage of
equipment and poses a safety hazard to the individual.
• For repainting operations, under no circumstances
shall the primer be completely removed to expose
the composite material substrate. Damage to surface
fibers usually occurs when primer is completely
removed.
Coatings shall be removed from composites, such as fiberglass,
carbon/graphite, and Kevlar® using only mechanical
removal techniques as specified in this chapter, unless specific
exceptions are provided in the appropriate maintenance manuals.
Due to the irregularities in composite surfaces, complete
removal of the paint and primer can damage fibers in the
composite surface layers. Therefore, paint removal, for the
purposes of recoating operations shall not go beyond the initial
primer coat.
2.2.2.1 Coatings removed from composite surfaces for the
purposes of performing coating repairs shall be performed by
hand sanding or by using an orbital sander. The use of other
types of powered sanders is prohibited due to the high potential
for causing laminate damage. Use extreme care during
topcoat and primer removal to prevent sanding into the laminate.
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