TO 35-1-3 - Robins Air Force Base
TO 35-1-3 - Robins Air Force Base
TO 35-1-3 - Robins Air Force Base
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<strong>TO</strong> <strong>35</strong>-1-3<br />
removed prior to the final blast operation. If the surface is<br />
chemically contaminated, it may be necessary to wash it or<br />
neutralize it before final blasting.<br />
The MWAS process produces high localized noise<br />
levels and ultraviolet radiation emissions from the arc<br />
region. Prior to commencing initial MWAS operations<br />
consult with the base bioenvironmental engineer<br />
(BEE) for approval. Proper hearing, eye protection,<br />
and respiratory PPE will be designated by the local<br />
BEE.<br />
3.16.5.1.3 The abrasive media used for cleaning heavily contaminated<br />
surfaces should not be reused for the final blast,<br />
even though it is rescreened as the media may contain contaminates<br />
that will be re-embedded in the metal surface causing<br />
corrosion and/or coating adhesion failure.<br />
3.16.5.1.4 Follow the thermal spray equipment manufacturers'<br />
preparation and application instructions. The metal coating<br />
shall be applied to a minimum thickness of 6 mils and maximum<br />
of 8 mils.<br />
3.16.5.1.5 Any surface, which shows visible moisture, rust,<br />
scale or other contamination shall be re-blasted before spraying.<br />
The surface must be completely coated to the specified<br />
thickness within six hours of abrasive blasting.<br />
The correct thickness of thermal spray coating in this<br />
application is critical. A coating that is too thin will<br />
not provide corrosion protection while a coating that<br />
is too thick will chip and flake off.<br />
3.16.5.1.6 The metalized coating shall be inspected for<br />
thickness by using the multi-metal dry film thickness gage to<br />
ensure correct surface thickness is achieved. Any thin or<br />
uncoated areas must be immediately roughened with a<br />
mechanical grinder with a minimum of a 25 grit disc to apply<br />
a “cross-hatch” pattern to the substrate. Immediately apply the<br />
thermal spray coating to reach the proper coating thickness.<br />
3.16.5.1.7 On high temperature components metalized with<br />
aluminum, organization may use METCOSEAL SA silicone<br />
aluminum sealer to prevent any rust staining that may occur.<br />
This sealer is available from:<br />
METCO INC.<br />
1101 Prospect Avenue<br />
Westbury, L.I., N.Y. 11590<br />
3.17 FIELD LEVEL MAINTENANCE PAINTING<br />
REQUIREMENTS.<br />
Field level maintenance-painting requirements for SE with<br />
polyurethane are divided into two types, touch-up painting and<br />
general maintenance painting.<br />
3.17.1 Touch-Up Painting. Touch-up painting is defined as<br />
minor touch-up and/or sectionalized painting of equipment<br />
using authorized coating to prevent corrosion. When spot<br />
painting, the amount of paint used should be enough to cover<br />
the affected area plus a one-inch overlap to seal the area's<br />
edges. Treat scratched areas that are one half inch wide by<br />
three inches long or less, or chips one inch in diameter or less<br />
will be touched-up with CPC (temporary repair), or approved<br />
primers and topcoats preloaded in items such as but not limited<br />
to: SEMPENS, Preval compressed air spray packs, Clip-<br />
Pacs, Brush and Roller, or Akzo Nobel Two-Component<br />
MIL-PRF-85285 Aerosol Can. Single component aerosols,<br />
enamels or laquers are not authorized coatings. Information<br />
about these materials can be viewed on the AFCPCO website<br />
located on the AF Portal. Larger scratches/chips in paint or<br />
damaged areas will be grounds to repaint the complete section<br />
per Paragraph 3.3.<br />
3.18 MAINTENANCE PAINTING.<br />
3.18.1 Maintenance Painting Restrictions. Although it is<br />
not recommended, it is a common field level practice during<br />
maintenance painting to repeatedly overcoat the entire exterior<br />
surface. Under no circumstance should the total number of<br />
layers of paint ever exceed six (6). The number of layers can<br />
be determined during the featheredge sanding of damaged<br />
areas. Count each layer of primer as one and each layer of<br />
topcoat as one, the total of which should never exceed six.<br />
3.18.1.1 Equipment exceeding this maximum number of<br />
paint layers should be scheduled for complete coating removal<br />
and repainting.<br />
Change 4 3-15